New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1856-04-05

properly concIuctcu may fJtte StA'i'N-' "''" N
cent force TO penetrate blinds shutters without pre-
ducing any very serious effect by the recoi The ex-
pepse attending the introduction Of this invention as
part of the Fise Department apparatus would appear
10 be very trifng il only being necessary TO create
some new offices, that of "gupners," in each com
pany, and supplying each gunner with a few charges
Judging from the effect OF the too.muchpuffed an
pihat,f" in checking fierce flames within building,
we consider this device worthy of attention.
ALIENS rsT.-MILL.-Mr Zadoc G. Allen OF
Buffalo, practical manufacturer OF this class Of ma
ehnery-has recently constructed mill which seems,
in several important respects superior to those nov
muse The spindle, or the upright shaft through
the center of the is continuous being, by the
peculiar construction OF the mill, made IN one piece,
in.tead of being divided as usual in the middle; and
the same being made adjustable ateray, both at top
and bottom allows of much more perfect tram
tban il generally attained The method Of connect
inc the stone to the spindle is far more perfect and
mechanically beautiful than any with which we are
famiar-beng in fact perfect universal joint with
ont possible slack This is attained by slottng
through the spindle and inserting fat thin driver,
or bar of iron, edge uppeunost and connecting 1t by
tapeIng pin in the center, and by suitable boxes at
each extremity. Each box being secured ~ the
stone by single bolt the whole IS as conveniently re-
moved when necessary, as are the more primitive ar
rangements. But the most conspicuous Innovation IS
in the holding down of the sone-which Is done by
lever and weight resembling those attachments to
.afety-vave. In all rapid grinding with Light stones,
il is common to hold the grinding surfaces together by
nprlyng screw to a lever pressing upon the spindle,
and in the best device of this kind this is
connected that it is always worked TO correspond with
the elevations of the stone by the ord nary light
Ter screw" BY that construction the upper
ter depressed proportion as the lower center land
consequently the stone is lowered by the miller in the
course of the work, and provided the adjustment of
all the parts is perfect, the operation of the mill is in
this precisely similar to the one under notice.
But such perfection il rarely attanable in practice,
and the spiI die is liable in positions to be either
loose or tightly held to become heated. Another
most obvious advantage of the new arrangement is
the liberty allowed to the stone to rise in case ef drop
ping any hard mass a nail, into the mill In brief
the device under notice appears TO be successful at
tempt to apply the most perfect of mechanism TO the
hanging of mill-stones, with the addition Of self
acting means of holding down the stone without
possibility of ever exceeding the required degree of
force The stone readily removed for picking ~
under the ordinary arrangements and the inventions
being rapidly adopted in the large h1uring mills in the
Western portion Of the State.
CRANDALL's SURVEYING IssTRCHEST.-Mr. T.. A.
Crandall, of Friendship, Allegheny Co, in ths State,
has inv, nttd instrument for indicating distances by
Inspection, which will, if completely successful be of
great value to surveyors everywhere, and particu-
larry in rough districts, where it is desirable to nea-
sure across rocks and chasms creeks and lakes The
principle is that of triaDgulation-a method always
adopted in extensive and accurate measurements as
in the Coast Survey, but which requires too much
figuring for ordinary fed-wOrk and especially for the
of excellent practical but rather auletered back
woods surveyors. Triangula.ion consist. in taking
two obsery atoms Of object, either at tie same
instant successively, from stations q short distance
apart go that the lines in which the object il viewed
shall taper in proportion corresponding according
a certain law with the distance Of the object Mr..
Crandalls instrument carries two small telescopes, |
each provided with the usual crosswires for very 40
cuJate pointing. One Of these is firmly fixed 10 the
Instrument but the other il free to swivel horizon.
tally and is ngeniously provided with very delicate
and accurate verneTs for reading off the angle The
distance apart Of the two telescopes il only foot
but with this narrow base the tdangulation may
be made 10 indicate distances great as a mile with
degree of accuracy depending OF course the cor
rectness of the instrument and the keen observation
Of the operator. To facilitate the me ssure ment Of
considerable distances, the extremely 81 gh. motion Of
the tetsc pc is magDfed the distance increases by
employing levers which voluntarily and successfully
come into play, and make the very slight change Of
position for every ten hundred feet very sens
bly, readable. The base of the triangle being uni
onnly foot il follows that the instrument may be
graduated not with degrees, minutes aud seconds but
with the distances themselves, in plain figures. The
value OF such instrument in de noting at once the
dis''nce of any inaccessible well familiar object
cannot well be overated; and we may be allowed to
hope for u early development Of the discovery In
form available TO all those fof whom il is intended
Messrs. Stsekpoie Brothers, the manufacturers of
come Of the most delicate mechanism Of this class
ever produced in America, are now engaged finish
ing and graduating the first fully perfected specimen
Of the new and as yet nearly uptried instruments
NEw BAsK-LocK.-Mr. T.. NJ. Hendrickson Of
Brooklyn has invented lock designed for the doors of
Safes and Banks, which materially differs from any
thing of the kind before in use. The central portion
OF the lock IL cylinder, which reyoyes with the key.
The key, instead of maintaining one fixed form, Is
made TO contain portion Of the mechanism, aud,
when pressed into it's place, extends three or more
slender arms TO touch many levers. These levers
catch in the sdes of the main bolt bolts, and pre-
vent the unlocking, unless they all worked a, the
same moment. None other than the right key can
penetrate the labyrnthiIe passages for this purpose
Nd as further provision against burglary, another
vt Of levers arranged which it Is necessary to de-
pre- precisely to certain extent before the cylinder
an be turned The key IS of cylindrical figure, bat
81 -.