Year: 1898

page_text: Date of Application, 1st Apr., 1898
Complete Specification Left, 29th Dec., 1893-Accepted, 4th Mar., 1899
[Communicated from abroad by GEORGE AMBROSE DUNN, Mechanic, and ROBERT
FRANKLIN DUNN, Vineyardist, both of the Village of Dinuba, in the County
of Tulare, and WILLIAM ALEXANDER CONN, Attorney at Law, of the City of
Fresno, in the County of Fresno, all being in the State of California, in the
United States of America.]
ARTHUR CHARLES WILKINSON, Architect, 33, Sydney Avenue, Black Rock,
Co. Dublin, Ireland, do hereby declare the nature of this invention to be as
follows:
-
My invention relates to an apparatus which is designed for the purpose of spray-
ing trees and plants with mixtures or solutions which are intended to destroy
insects and vermin, and to otherwise improve the condition of the trees or plants
thus sprayed; or for the purpose of spraying or sprinkling grounds, roads, walks,
avenues and the like with water or other liquid: It consists essentially in the
novel construction of the tank or vessel containing the solution, a means for
strengthening the same and cheapening the construction thereof in combination
therewith of an air forcing pump, with means for reversing the flow of air into
the tank, means for straining the liquid before it is discharged, means for cleaning
the strainer in case it becomes clogged, and in details of construction which will be
more fully explained by reference to the drawings:-Fig. 1 is a sectional view of
the spraying apparatus showing the method of strengthening the barrel and designed
to be operated by hand power:-Fig. 2 is another view showing a different
method of strengthening the barrel: Fig 3 is an enlarged view showing the position
of the threeway cocks, the strainer, and the flexible connections with pump.
Fig. 4 is a rear view of the spraying apparatus designed to be propelled by horses
and to roll over the surface of the ground.
Fig. 5 is a view showing it as a sprinkler.
For the purpose of containing the liquid to be used I employ an air tight tank
or reservoir which may be made of wood, iron or steel of sufficient strength to
withstand the internal pressure and into this is placed a spraying solution or
liquid which can be introduced at any time through an inlet provided with
removable stopper as shown at W in Fig. 1, and at 0 in Figs. 4 and 5, when no
pressure is on.
The tank A in Figs. 1 and 2 is shown as being made in the form of a barrel
having wooden staves with exterior hoops, as this is cheaper than a specially
constructed tank. In order to strengthen the barrel to enable it to resist the
interior pressure I fix a piece of plank or an iron plate C at each end of the barrel
so that these plates will lie at right angles or cross wise of the pieces forming the
heads 1) of the barrel. In order to secure these pieces and to insure the proper
resisting force, these strengthening pieces are held firmly in place by one or more
rods E, F, which as shown in Fig. 2 extend exterior to the barrel and pass

page_text: through bars C¹ which rests upon the strengthening pieces C, the latter, as before
described, resting upon the heads of the barrel. By means of suitable nuts H
fitting upon the ends of the rod, any desired degree of tension may be produced and
a corresponding pressure upon the strengthening pieces C will be sufficient to
resist any strain which might otherwise dislodge the heads. In Fig. 1 the
connecting rods E and F are shown as being made tubular and extending through
the heads D and the strengthening pieces and having upon the lower ends the
enlargements or cap pieces G. Between the heads or strengthening pieces or
otherwise fitting these pipes, is suitable packing which will prevent leakage at
the points where they pass through the heads. These tubes have perforations as
shown at U and V made in them near the bottom or lower head of the barrel
for the purpose of admitting the air which is forced into the barrel by means of
the air pump B. The nuts H in this case screw upon the threaded upper ends
of the pipes E and F and thus secure them firmly in place. The upper end of
the pipe E is connected by a rubber or flexible connection I with the valve
chamber of the pump B, and a stop cock N is so arranged that communication
between the connection I and the pipe E may be cut off when desired as will be
hereafter described. From the valve chamber a second rubber or flexible connect-
ing pipe extends, and its outer end unites with a three-way cock K. Where
the pipe emerges through the upper head of the barrel is a stop cock M, and
above this is what is termed a union" L. Within this union is fitted a screen I
which is designed to prevent any solid matter escaping from the tank. The
upper part of the union connects with a three-way cock K, and from the opposite
side of this cock extends the flexible spray pipe P having any suitable or desired
form of nozzle Q. S is an agitator suitably fulcrumed in the lower part of the tank
and having its opposite end connected with a rod T extending up through a
stuffing-box R and provided with a handle at the upper end by which it can be
moved up and down through the stuffing box so as to operate the agitator when
the latter is needed. In most cases however, a sufficient agitation of the liquid
is produced by the passage of the air discharged through the outlet openings V
in the pipe E.
J
66
In Fig. 4, A is a cylinder which may be made of any suitable material, as
boiler iron or steel, and of sufficient strength to resist the internal pressure that
may be applied to it.
This cylinder has journals or trunnions B which turn in a frame C, the frame
being preferably made of tubular metal and of any suitable shape for the purpose.
To this frame is connected the usual or ordinary means for drawing or propelling
the device over the surface of the land or upon a road, the cylinder rolling upon
the surface as it moves. At a suitable point on the frame C is journaled a shaft D,
having a roller E fixed upon it and adapted to roll in contact with a drum or
cylinder A. F is an air pump fixed to the frame C, and its plunger is actuated
by a connecting rod or pitman G from the crank wheel H, which is fixed upon the
shaft D. From this pump a pipe I leads into the end of the hollow shaft or
trunnion B at that side, passing through a suitable stuffing-box J, which prevents
leakage at this point. This pipe is of sufficient diameter to admit of a second
pipe inside of it, as shown. The pipe K has an angular bend, which allows its
lower end to extend down to a point near the bottom of the interior of the
cylinder A, where it is provided with a strainer L, or the strainer may be placed
exterior to the tank at a point in the discharge pipe K between the three-way
cock R and the place where service cock Q connects with the discharge pipe K.
Provision is made for a tight joint at the point where the pipe K passes out through
the pipe I and thence to any desired point of discharge. If the apparatus
is to be used for spraying trees, the pipe may terminate in a hose and nozzle
adapted for this purpose, as shown at M. If to be used at street sprinkling, the
pipe K is correspondingly bent after emerging from the shaft or trunnions B and
carried to the point where it is desired to deliver the water to any of the usual or
well-known forms of sprinklers employed for this purpose.

page_text: The operation of the hand device will then be as follows:
The three-way cock is turned so as to provide a communication directly from
the pipe F to the discharge pipe P, the stop cock M and N being also open. The
pump being now set in operation air is pumped into the chamber 0 and escapes
thence through the flexible connecting pipe I, the valve N, into the pipe E which
extends to the bottom of the tank, and the air discharged through the openings V
keeps up a constant agitation of the liquid contents of the tank. This agitation may
be increased if found necessary or desirable by operating the mechanical agitator S
as previously described. The liquid thus agitated will be forced, by the pressure
of the air which rises to the upper part of the tank, to flow into the pipe F and
thence out through the strainer L and the discharge pipe, which, being flexible,
allows the nozzle to be directed to any desired point. If for any reason the
strainer L becomes clogged, the valve N is closed and the cock K is turned so as
to connect the flexible connecting pipe J directing with the passage downward
through the strainer L, the connection with the discharge pipe P being temporarily
cut off. The pressure of air may then be forced downward through the strainer
and this will ordinarily disengage any substance by which the strainer may be
clogged. The material thus dislodged may be either forced downward into the
pipe F, or by means of an opening in that part of the pipe below the union L and
exterior to the barrel or tank, the clogging substance may be discharged directly
and outside the tank. If for any reason it be found necessary to remove the
strainer entirely it is only necessary to unscrew the union L after closing the stop
cock M so that the pressure will remain within the tank and the strainer can then
be taken out and cleansed or a new one substituted, there being no loss of pressure
from within the tank by this operation. The flexibility of the connections I and J
enables the parts to be all disengaged whenever necessary and by closing the
stop cocks M and N the pressure in the interior of the tank will not be disturbed.
All parts of the apparatus are thus placed within easy reach and by the arrange-
ment here shown we are enabled to pump air into the tank and force the contents
out with any degree of pressure without passing the material through the pump,
which in many cases would be injurious to it.
The operation of the device shown in Figs. 4 and. 5 will be as follows:-The
tank A is partially filled with the liquid to be used. If it is to be used for street
purposes, it may be ordinary water, and the tank is provided with a suitable
opening, as at O, for refilling when exhausted. If a solution is to be used, as in
the case of spraying trees, it will be introduced in the same manner, and the
machine being started the rolling of the drum or cylinder keeps the solution
agitated and in proper condition to be applied to the trees. In addition to this
the apparatus acts as a roller to crush any clods and to generally keep the surface
in good shape. The contact-wheel E is kept in rotation by the action of the
cylinder, and through its shaft 1) and the crank at H it actuates the air pump, thus
forcing the supply of air through the pipe I into the interior of the cylinder,
where as much pressure may be accumulated as is desired. This pressure acting
upon the surface of the liquid in the cylinder constantly forces it out through the
pipe K, when a controlling-cock is opened, and thence to the nozzle or other
discharge M. If for any reason the strainer L becomes clogged, the service cock S,
and the three-way cock R are closed and the cock Q is turned so as to conduct the
air leading from the pipe I into the pipe K thereby forcing the air downward
through the pipe K and out through the strainer L, dislodging any obstruction.
The same operation being used to cleanse the strainer if the strainer were placed as
described in the pipe K exterior to the tank. It will be seen that the rotation of
the cylinder upon the ground will produce sufficient pressure within it to allow it
to be stopped whenever a tree is reached and a tree thoroughly sprayed before
proceeding.
The travel between that and the next tree will again produce a sufficient pressure
within the cylinder and thus the work is continued. When used as a street sprinkler,

page_text: the air supply will always be sufficient to keep a proper pressure upon the liquid
in the cylinder.
N is a safety valve for the air pump connection and P is a brush or scraper
adapted to keep that portion of the cylinder clear against which the roller E
impinges.
Datad this Winst dow of An 1908
Spraying and Sprinkling Apparatus.
ARTHUR CHARLES WILKINSON, Architect, a citizen of Great Britain, residing
at 33, Sydney Avenue, Black Rock, in the County of Dublin, Ireland, do hereby
declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
My invention relates to an apparatus which is designed for the purpose of
spraying trees and plants with mixtures or solutions which are intended to destroy
insects and vermin, and to otherwise improve the condition of the trees or plants
thus sprayed, or for the purpose of spraying or sprinkling grounds, roads, walks,
avenues, and the like with water or other liquid:-It consists essentially in the
novel construction of the tank or vessel containing the solution, a means for
strengthening and cheapening the construction thereof, in combination therewith
of an air forcing pump, with means for reversing the flow of air into the tank,
means for straining the liquid before it is discharged, means for cleaning the
strainer in case it becomes clogged, and in details of construction which will be
more fully explained by reference to the drawings left with Provisional Specifica-
tion in which: Fig. 1 is a sectional view of the spraying apparatus showing the
method of strengthening the barrel and designed to be operated by hand power.
Fig. 2 is another view showing a different method of strengthening the barrel.
Fig. 3 is an enlarged view showing the position of the three-way cocks, the
strainer, and the flexible connection with the pump.
Fig. 4 is a rear view of the spraying apparatus designed to be propelled by
horses and to roll over the surface of the ground.
Fig. 5 is a view showing it as a sprinkler.
For the purpose of containing the liquid to be used I employ an air tight tank
or reservoir which may be made of wood, iron, or steel of sufficient strength to
withstand the internal pressure, and into this is placed a spraying solution or liquid
which can be introduced at any time through an inlet provided with removable
stopper as shewn at W in Fig. 1, and at 0 in Figs. 4 and 5 when no pressure
is on.
The tank A in Figs. 1 and 2 is shown as being made in the form of a barrel
having wooden staves with exterior hoops, as this is cheaper than a specially con-
structed tank. In order to strengthen the barrel to enable it to resist the interior
pressure I fix a piece of plank or an iron plate C at each end of the barrel so that
these plates will lie at right angles or crosswise of the pieces forming the
headings of the barrel. In order to secure these pieces and to insure the
proper resisting force, these strengthening pieces are held firmly in place by
one or more rods E, F, which as shown in Fig. 2 extend exterior to the barrel,
and pass through bars C¹ which rest upon the strengthening pieces C, the latter,
as before described, resting upon the heads of the barrel. By means of suitable
nuts fitting upon the ends of the rod any desired degree of tension may be

page_text: produced and a corresponding pressure upon the strengthening pieces C will be
sufficient to resist any strain which might otherwise dislodge the heads. In
Fig. 1 the connecting rods E and F are shown as being made tubular and extend-
ing through the heads 1) and the strengthening pieces and having upon the lower
ends the enlargements or cap pieces G. Between the heads or strengthening
pieces or otherwise fitting these pipes, is suitable packing which will prevent
leakage at the points where they pass through the heads. These tubes have
perforations as shown at U and V made in them near the bottom or lower head
of the barrel for the purpose of admitting the air which is forced into the barrel by
means of the air pump B. The nuts H in this case screw upon the upper ends of
the pipes E and F and thus secure them firmly in place. The end of the
upper
pipe E is connected by a rubber or flexible connection I with the chamber O
of the pump B, and a stop cock N is so arranged that communication between
the connection I and the pipe E may be cut off when desired as will be hereafter
described. From the valve chamber a second rubber or flexible connecting pipe J
extends and its outer end unites with a three way cock K. Where the pipe F
emerges through the upper head of the barrel is a stop cock M and above this is
what is termed a union "L. Within this union is fitted a screen which is
designed to prevent any solid matter escaping from the tank. The upper part of
the union connects with a three way cock K and from the opposite side of this
cock extends the flexible spray pipe P having any suitable or desired form of
nozzle Q. S is an agitator suitably fulcrummed in the lower part of the tank
and having its opposite end connected with a rod T extending up through a
stuffing box R and provided with a handle at the upper end by which it can be
moved up and down through the stuffing box so as to operate the agitator when
the latter is needed. In most cases however a sufficient agitation of the liquid is
produced by the passage of the air discharged through the outlet openings Vin
the pipe E.
In Fig. 4 A is a cylinder which may be made of any suitable material, as boiler
iron or steel, and of sufficient strength to resist the internal pressure which may be
applied to it. This cylinder has journals or trunnions B which turn in a frame C
the frame being preferably made of tubular metal and of any suitable shape for the
purpose. To this frame is connected the usual or ordinary means for drawing
or propelling the device over the surface of the land or upon a road, the cylinder
rolling upon the surface as it moves. At a suitable point on the frame C is
journalled a shaft D), having a roller or wheel E fixed upon it and adapted to roll
in contact with a drum or cylinder A or in contact with a wheel bolted to end of
said drum or cylinder. F is an air pump fixed to the frame C and its plunger is
actuated by a connecting rod or pitman & from the crank wheel H which is fixed
upon the shaft 1. From this pump a pipe I leads into the end of the hollow shaft
or trunnion B at that side, passing through a suitable stuffing box which
prevents leakage at this point. This pipe is of sufficient diameter to admit of a second
pipe K inside of it as shown. The pipe K has an angular bend, which allows its lower
end to extend down to the point near the bottom of the interior of the cylinder A,
where it is provided with a strainer L, or the strainer may be placed exterior to
the tank at a point in the discharge pipe K between the three-way cock R and the
place where service cock Q connects with the discharge pipe K. Provision is
made for a tight joint at the point where the pipe K passes out through the
pipe I and thence to any desired point of discharge. If the apparatus is to be
used for spraying trees, the pipe may terminate in a hose and nozzle adapted for
this purpose, as shown at M. If to be used at street sprinkling the pipe K is
correspondingly bent after emerging from the shaft or trunnions B, and carried
to the point where it is desired to deliver the water to any of the usual or well
known forms of sprinklers employed for this purpose.
The operation of the hand device will then be as follows:-The threeway cock
is turned so as to provide a communication directly from the pipe F to the
discharge pipe P, the stop cocks M and N being also open. The pump being

page_text: now set in operation air is pumped into the chamber and escapes thence through
the flexible connecting pipe I, the valve N, into the pipe E which extends to the
bottom of the tank, and the air discharged through the openings V keeps up a
constant agitation of the liquid contents of the tank. This agitation may be
increased if found desirable or necessary by operating the mechanical agitator S as
previously described. The liquid thus agitated will be forced by the pressure of
the air which rises to the upper part of the tank to flow into the pipe F and thence
out through the strainer and the discharge pipe, which being flexible allows the
nozzle to be directed to any desired point. If for any reason the strainer
becomes clogged the valve N is closed and the cock K is turned so as to connect
the flexible connecting pipe J directing with the passage downward through the
strainer 7, the connection with the discharge pipe P being temporarily cut off.
The pressure of the air may then be forced downward through the strainer and
this will ordinarily disengage any substance by which the strainer may be clogged.
The material thus dislodged may be either forced downward into the pipe F, or by
means of an opening in that part of the pipe below the union L and exterior to
the barrel or tank, the clogging substance may be discharged directly and outside
the tank. If for any reason it be found necessary to remove the
strainer entirely it is only necessary to unscrew the union L after
clozing the stop cock M, so that the pressure will remain within the tank and
the strainer can then be taken out and cleaned or a new one substituted there
being no loss of pressure within the tank by this operation.
The flexibility of connections I and J.enables the parts to be all disengaged
whenever necessary and by closing the stop cocks M and N the pressure in the
interior of the tank will not be disturbed. All parts of the apparatus are thus
placed within easy reach, and by the arrangements here shown we are enabled
to pump air into the tank and force the contents out with any degree of pressure
without passing the material through the pump, which in many cases would be
injurious to it.
The operation of the device shown in Figs. 4 and 5 will be as follows:-The
tank is partially filled with the liquid to be used. If it is to be used for
street purposes it may be ordinary water, and the tank is provided with a suitable
opening as at 0 for re-filling when exhausted. If a solution is to be used as in
the case of spraying trees it will be introduced in the same manner, and the
machine being started the rolling of the drum or cylinder keeps the solution
agitated and in proper condition to be applied to the trees. In addition to this
the apparates acts as a roller to crush any clods and to generally keep the surface
in good shape.
The contact wheel E is kept in rotation by the action of the cylinder, and through
its shaft I) and the crank at H it actuates the air pump, thus forcing the supply of
air through the pipe I into the interior of the cylinder, where as much pressure
may be accumulated as is desired. This pressure acting upon the surface of the
liquid in the cylinder constantly forces it out through the pipe K when a controlling
cock is opened, and thence to the nozzle or other discharge M. If for any
reason the strainer L becomes clogged, the service cock S and the three way cock R
are closed, and the cock Q is turned so as to conduct the air leading from the
pipe I into the pipe K thereby forcing the air downwards through the pipe K
and out through the strainer L, dislodging any obstruction, the same operation
being used to cleanse the strainer, if the strainer were placed as described, in
the pipe K exterior to the tank. It will be seen that the rotation of the cylinder
upon the ground will produce sufficient pressure within it to allow it to be stopped
whenever a tree is reached, and a tree thoroughly sprayed before proceeding. The
travel between that and the next tree will again produce a sufficient pressure within
the cylinder and thus the work is continued.
When used as a street sprinkler the air will always be sufficient to keep a proper
pressure upon the liquid in the cylinder.
N is a safety valve for the air pump connection, and P is a brush or scraper

page_text: adapted to keep that portion of the cylinder clear against which the roller E
impinges.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed. I declare that what
I claim is
י
.
passages
1st. In a spraying and sprinkling apparatus, a tank, inlet and outlet
extending to the bottom thereof having perforations respectively for the admission
of air and the escape of liquid under pressure thus generated, a pump and exterior
connections whereby air may be forced therethrough into the inlet passage, and
an independent discharge through which the liquid escapes without coming into
contact with the pump.
!
2nd. In a spraying and sprinkling apparatus, a tank having an inlet pipe extend-
ing from the top to the bottom with perforations near the bottom for the passage of
air whereby the contents of the tank are agitated and a pressure established within
the tank, a discharge pipe also extending from the top to the bottom of the tank
and having perforations for the passage of the liquid into it, a discharge pipe
connecting with said pipe exterior to the tank, a pump having a valve chamber,
connections between the said chamber and inlet pipe, and also with the outlet
pipe, cocks by which said pipes may be independently closed or opened whereby
the discharge of the air may be diverted to either of said pipes.
3rd. In a spraying apparatus, an air-tight containing tank, an inlet and a dis-
charge pipe extending from the top to near the bottom of the interior of the tank
having perforations near the bottom through which air is discharged into the tank
from the inlet pipe, and the liquid under the pressure thus generated is forced into
the 'outlet pipe, a strainer fixed in the outlet pipe exterior to the tank, a discharge
pipe connecting with the pipe above the strainer, a pump having a valve chamber,
connections between said valve chamber and the inlet pipe, and also with the
outlet pipe, a threeway cock with which said pipe connects, and by which air
may be directed through the strainer and a cock in the inlet pipe whereby the
passage of air therethrough can at the same time be prevented.
4th. In a spraying apparatus an air tight tank, inlet and outlet pipes disposed
as shown, a pump connecting with both inlet and outlet pipes exterior to the tank,
cocks whereby the connection with either of said pipes may be open or closed, a
strainer interposed between the connections with the outlet pipe and the tank, and
cocks whereby the air may be cut off from the inlet pipe and directed into the outlet
pipe above the strainer so as to discharge air therethrough to clean the strainer.
5th. In a spraying apparatus a tank having inlet and outlet pipes with con-
trolling cocks, an air-pump and flexible connections between the air
pump and each
of said pipes, a strainer interposed in the outlet pipe between the air inlet passage
and the tank whereby air may be forced backwards through the strainer to clean
it out, and inlet and outlet pipes may be closed to maintain a pressure within the
tank and allow the disengagement of the flexible connecting pipes without loss
of pressure.
6th. In a spraying apparatus an air-tight tank, pipes extending from the top to
the bottom thereof, an air-pump and flexible connections between it and both
inlet and outlet pipes and perforations made in the lower end of said pipes within
the tank whereby air may be forced therethrough to agitate the contained liquid
and produce an internal pressure within the tank.
7th. In a spraying apparatus of a character described, inlet and outlet pipes
with perforations at the bottom and connected air-pump for the injection of air into
the tank, and a supplemental mechanical agitator situated within the tank, and
having a connecting rod extending therefrom through the stuffing box at the
upper end as herein described.
8th. In a spraying apparatus a barrel shaped tank having flat heads at the
top and bottom, strengthening plates fitting across and in contact with said heads,

page_text: pressure plates and screw threaded connecting rods whereby said plates are drawn
into contact with the heads as described.
9th. In a spraying apparatus, a barrel shaped tank having flat heads, strengthen-
ing plates fitting the exterior of said heads, tubes extending through said plates,
and heads having closed caps at the lower end and nuts fitting the screw threaded
exterior at the upper end and turnable so as to force the strengthening plates
against the heads, said tubes having perforations near the bottom interior to
the barrel, an air-pump having flexible connections with said tubes, cocks whereby
the air from the pump may be delivered through the inlet pipe to agitate the
contained liquid, and provide an interior pressure, similar perforations in the
outlet pipe for the escape of the liquid, a strainer interposed between the air
passage of the outlet pipe and the interior of the tank, and cocks whereby the air
may be diverted from the inlet pipe to pass backwards through the strainer to
the outlet pipe.
10th. A sprinkling apparatus consisting of a hollow cylinder or roller, a frame
within which it is journalled, and to which power may be applied to move it over
the ground, a shaft journalled upon said frame having fixed to it a wheel or roller
adapted to make contact with the periphery of the cylinder, or with wheel bolted
to end of cylinder, whereby the shaft is revolved, a cleaner acting on the surface of
the cylinder in advance of the wheel or roller to keep that portion of the cylinder or
wheel clean which the roller or wheel engages, a crank fixed upon the shaft, and an
air pump with which it is connected, a pipe leading therefrom to the interior of
the cylinder, and a discharge pipe leading from the interior of the cylinder whereby
the liquid contained therein is delivered under pressure.
11th. A sprinkling device consisting of a hollow cylinder or roller adapted to
contain liquid, a frame in which the trunnions of said cylinder are journalled
and to which power may be applied to propel it over the ground, a shaft having a
roller or wheel making contact with the outer periphery of the cylinder, or with
wheel bolted to end of cylinder and rotated thereby, a crank upon said shaft, an
air-pump connected therewith, a pipe leading from the air pump through the
trunnion of the roller, and delivering air to the interior of the cylinder, a second
pipe extending through the air pipe so as to leave a circumscribing air passage, having
its mouth terminating within the cylinder near the hottom, and the outer end
connected with the sprinkling or spraying device.
12th. A spraying or sprinkling apparatus consisting of a hollow cylinder or
roller, a frame within which it is journalled and to which power may be applied to
move it over the ground, a shaft journalled upon said frame, a crank upon said
shaft, an air pump connected therewith, a pipe leading from the air pump through
the trunnion of the roller and delivering air to the interior of the cylinder, a
threeway cock placed in said pipe exterior to the tank, connection made between
the air pipe and the discharge pipe, said connection being provided with a service
cock whereby the air may be diverted downwards through that portion of the
discharge pipe in which the strainer is placed.