New-York tribune., 1876-04-08

CARRE's CAEAFE IcE MACHINE-M. Carr6. whose
name is well known in connection with the invcn-
ton of several forms of ice-machines, has lately
added to his achievements in this field, by designing
another cOntriyance for the same purpose which,
for effectiveness, simplicity, and general utility, If
accounts may be credited bids fair to surpass every
thing of this kind that has yet been produced The
new machine can be easily operated by even an i'll
experienced person after one OF two trials, and may
bo properly designated as family ice-machnne"
The essential parts of the apparatus consist of
air-pump capable of producing a good vacuum. a
horizontal cylindrical receiver partially filled with
suphuric acid and the caTafe or flask, in which the
water is frozen, and which Is connected with the re-
ceiver land consequently with the pump by a suit
able pipe, or tube, provided with necessary stop
cock. The carafe is suspended from the tube by
means of an inda-rubber ring, which msures an
ar-tight joint between ii and the receiver.
The operation of the apparatus is as follows ::
The carafe. all ordinary flask with elongated neck
and sweled body is half filled with water and sus-
pended from the table before mentioned by means
of the rubber ring OF cork. In order TO insure the
perfect tghtness Of the joint between the flask and
the tube upon which the of the operation of
freezing is largely dependent, the stOpcock upon the
tube is closed, small quantity of water is poured
between the cork and rim of the glass Ito render
any subsequent leakage visible, few strokes of the
pump are made to exhaust partially the acid re-
ceiver, aud the stOpcOck is turned The effect Of
this preliminary manipulation is to attach firmly the
flask to the tube by atmospheric pressure and in
sure perfectly aIr-tight Joint. The pump is now
worked rapidly for a few minutcs. when the water
IN the fask begins TO eyap0Tate rapidly and 1T last
bursts into violent ebulitiOn The vapor evolved
is drawn through the receiver containing the acid
which at once absOrbs and condcnses IT, Very soon
few filaments of ice will be observed TO form in
the water, and the pumping is TO be continued for
few minutes longer. after which a stop-cock CON
meeting the pump with the receiver is closed and
the flask left on the tube In fifteen or twenty
minutes afterward the water viii Ice found 10 be
frozen throughout. The flask can then be removed
and another substituted, and If the stOp-cOck be-
tween tue liask and receiver closed previously
10 the removal of flask No. l. the vacuum in the Te-
celyeT viii have been preserved, aud much of the
preliminary pumping may be dispensed with III the
case Of flask No. 2.
The theory Of this operation is the same that of
tAe familiar lectuTe-rOOin experiment OF freezing
water by its own evaporation. In the case OF NJ.
Csrres device, the rapid evaporation of the water
enected with the pump by reet of pressure is ma
tGfialy aided by powerful absOrptve qualities Of
she suipburic acid In the receiver and IN order TO
insure better contact of the acid and yapOr, in
sshious apparatus called the agitator Is provided by
VIC inventor which stlTs up the acid during the
motion Of the pump. This agitator consists of
E@cker @ furnished with paddles, and extending the
"Ds'n OIL Tie receiver, the motion VI the rocker