Abstracts of English and colonial patent specifications relating to the preservation of food, etc. : compiled from original documents, or their printed copies, lodged in the Patent Office attached to the Registrar-General's Department, Melbourne / by William Henry Archer.

  • Archer, William Henry, 1825-1909.
Date:
1870
Catalogue details

Licence: Public Domain Mark

Credit: Abstracts of English and colonial patent specifications relating to the preservation of food, etc. : compiled from original documents, or their printed copies, lodged in the Patent Office attached to the Registrar-General's Department, Melbourne / by William Henry Archer. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    11 top, and with iron rings at top and bottom.” These are so suspended that their bottoms do not quite touch the bottoms of the ice-chests. The valve-slides are worked by rods and excentrics. The mode of operation is as follows :—“ The air-pump being set in motion,” and the piston moving upwards, the air within is “ forced out through “ the exhaust-valve F1. While this is taking place the exhaust-valve u F and the valves in the valve-chest G H111 are shut, and the valves “ in valve-chest G1 HI are open. The effect of this is that the air in “ the air-chamber K passes into the ice-chest L, expands, circulates round “ the ice-bags R R containing the water to be frozen, and a part of it is “ drawn into the interior of the air-pump cylinder A. When the reverse “ action of the piston takes place, the valves in the valve-chests G H1 I1 “ open, and the valves in G1 H I shut ; the air drawn into the air-pump “ cylinder from the air-chamber K is forced out through the exhaust- “ valve F, while atmospheric air enters the air-chamber K through the “ open valve in the valve-chest G, and is ready to be expanded at the “ return stroke of the air-pump piston when the valve in G is shut and “ the valve in II opens, and the measure of air in the air-chamber Iv “ rushes into the partially exhausted ice-chest L, and circulates, as “ before described, until it is drawn into the cylinder A. By these “ means the expansion of a measured quantity of air from the air- “ chamber K in the ice-chest L produces intense cold, which gradually “ extracts the heat from the water contained in the ice-bags R R and “ converts it into ice.”—[Viet. 1858, September 7. No. N.S.W. 1858, November 1. No. 14.] J. D. Postle. Produces cold to be applied to the preservation of meat, &c., by condensing atmospheric air, removing the increased tem- perature imparted to the same, and taking advantage of the absorption of latent heat consequent upon such compressed and cooled air returning to its natural condition ; or by passing air through tubes immersed in ether caused to boil in vacuo. In an amended specification the inventor lowers the temperature of the compressed air by the admission into the cylinder of a jet of water at each stroke of the piston. The receiver is so arranged that the air, previous to expansion, has to pass through a series of tubes immersed in water. By means of an expansion cylinder, similar to the cylinder of a steam-engine, the force of the expanding air is utilized. In the drawings attached to the amended specification, Fig. VII.A is a plan of the steam- engine and refrigerating apparatus, &c., VII.B a back elevation of “ pump and expansion cylinder,” and VII.C a front elevation of ‘‘receiver “ and expansion cyliuder.” The details of the apparatus are described at length in the original specifications.—[Viet. 1867, November 6. Nos. 1069 and 1069A.] J. D. Postle. Improves the preceding patent; by making the pump and expansion cylinder with jackets ; between these and the inner walls water is allowed to flow, so as to cool the compressed air ; by a new kind of valve for regulating the admission of air into the cylinder in which