Potter's Saggar Dispensing with Wad Clay in Placing and Firing Glost Ware.
Year: 1888

page_text: Date of Application, 24th Sept., 1888
Complete Specification Left, 24th June, 1889-Accepted, 27th July, 1889
PROVISIONAL SPECIFICATION.
A Potter's Saggar Dispensing with Wad Clay in Placing and
Firing Glost Ware.
JOSEPH PULLAN GUY Armley House Burslem Staffordshire, Brick Manufacturer
and Saggar Marl Producer, do hereby declare the nature of this invention to be as
follows
Potter's Saggar-round, square, oval, or oblong, made by hand or machine. By
depressing the bottom rim by means of hand-tool or machine mould each saggar
will form a lid when fitted on the top rim of another saggar,-the said top rim will
have a groove, convex or concave the bottom rim will have a tongue convex or concave
so that by dovetailing into each other, the "bung" of saggars will be more securely
built up in the Oven, at the same time my invention will more effectually prevent
the admission of sulphurous fumes inside the saggar and do away with the use of wad
clay now placed on the top rim of each saggar containing "glost" ware.
Dated this 22nd day of September 1888.
COMPLETE SPECIFICATION.
A Potter's Sagger Dispensing with Wad Clay in Placing and
Firing Glost Ware.
I JOSEPH PULLAN GUY of Armley House Burslem in the County of Stafford
Manufacturer 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
:-
This invention relates to improvements in potters saggers so as to dispense with what
is known as "wad" clay in placing and firing glost ware and also building up more
securely or "nesting" saggers used in potters ovens.
Hitherto the saggers whether of round square oval oblong or other shape have
been made with their top and bottom edges flat and when such saggers are
placed or stocked one on top of another in the potters oven or "firing" chamber
wad clay has been used on the top rim of each sagger to make tight the joint between
each such sagger and the next one above it so as to prevent the admission of the
sulphurous fumes etcetera to the "glost" ware in the saggers, and to do this entailed
considerable labour and skill and moreover damage was frequently caused by the
imperfect insulation with this method of packing as the wad clay through "spitting
flying" or "spurting" often cracked and opened under heat thus injuring the glost
"
ware.
وو
Now my present invention consists in so forming constructing and arranging
saggers for the above named purposes as to dispense with the use of wad clay and
thus not only save the cost of such material but effect considerable economy in the
space occupied and also in the time and labour hitherto occupied in "placing" saggers
in the oven.
For this purpose I construct the sagger (of the desired shape) with its upper edge
either curved (concave or convex) rabbeted grooved tongued or of other suitable
form in cross section and I make the bottom edge or rim of inverse form in cross
section so as to fit and correspond when the bottom of one such sagger rests on the
upper edge or rim of the sagger underneath it.
By this means these saggers when stacked will form a sort of lid to one another
and make approximately tight joints without the application of wad clay and will
thus by reason of their "nesting" closely together-take up less space.

page_text: And in order that my said invention may be fully understood and readily carried
into practice I have caused a sheet of drawings to be hereunto annexed which will
serve to illustrate the method of carrying my invention into practice in several
different ways.
Figure 1 is a view in sectional sido elevation of several saggers constructed in
accordance with my present invention and stacked and nesting, one upon another.
Figure 2 is a plan of Figure 1 showing an oval sagger and Figures 3, 4, 5, 6, and 7
show other curves or forms of joint.
In all the Figures it will be noticed that in order to compensate for any weakening
of the lower part of the sagger caused by the depression in the lower edge or rim
an extra thickness of material is used as shown at the points marked a (and this is
readily done by simply chamfering off or bevelling off the bottom edge of the inside
mould when the sagger is made by machinery) so as to give the thickness and strength
at the point a or such extra thickness or strength may be obtained in any other
suitable manner for instance by means of an internal bead etcetera.
The particular form of rims shown at Figures 6 and 7 will be found very
advantageous in practice (the lower rim being made curved of a somewhat cancave
form) and either of these sections will give great strength in use.
The floor c of the furnace may be provided with a raised rim as shown at
Figure 1 to correspond with the shape of the bottom rim of the lowermost
sagger.
2
In practice it will be found desirable to make the "male" rim (whether top or
bottom of the sagger) a shade smaller than the female rim so as to allow for
expansion under heat.
If desired a sprinkling of sand or marl or the like material may be used when
building up these saggers in the potters ovens or furnaces.
These improved saggers may be produced in any well known or suitable manner
for instance by means of a hand tool iron mould or machine mould.
1 would have it clearly and distinctly understood that I do not limit myself to
any particular shape or form of joint in cross section for making joints in the
aforesaid manner as any suitable form or shape of joint may be used according to
my invention.
And furthermore it will be obvious that my improved saggers may be utilised for
other than "glost" ware (as for instance in potters ovens known as "biscuit" ovens)
if found suitable and applicable.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that.what I
claim is
1. Potters saggers for glost ware having the top and bottom rims of such a form
or shape other than flat in cross section that the bottom rim of one will fit into or
onto the top rim of another to form a tight joint for placing and firing in the ovens
or furnaces.
2. An improved potters sagger for glost ware having the lower rim of a shape
other than flat to correspond with and fit into or onto the upper rim of the next
sagger below it when "placing" in potters ovens so as to dispense with the use of
wad clay.
3. The use and application of potters saggers for glost ware arranged and
constructed substantially in the manner and for the purposes hereinbefore set forth.
4. Dispensing with wad clay with potters saggers in placing and firing glost ware
substantially as and for the purposes set forth.
D1 54 1.. 2 T1000
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Patentee.