Abridgments of the specifications relating to preservation of food / printed by order of the Commissioners of Patents.

Date:
1857
Catalogue details

Licence: Public Domain Mark

Credit: Abridgments of the specifications relating to preservation of food / printed by order of the Commissioners of Patents. Source: Wellcome Collection.

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    “ or of earthenware, of any shape and size required, strong enough “ to withstand the pressure of the atmosphere when exhausted.’’ In the lid there is a “ protuberance wherein a valve is fitted that “ will let the air escape out of the vessel, but not suffer it to come “ in,” when it is exhausted by a particular exhausting machine described. “ The process with the common air pump” is said to be “ tedious, and not to be relied upon.” [Printed, (kl. See Rolls Chapel Reports, 7th Report, p. 208.] A.D. 1810, August 25.—N° 3372. DURAND, Peter.—First, “ Preserving animal food, vegetable “ food, and other perishable articles a long time from perishing “ and becoming useless,” by excluding “ all communication with “ the external air.” The food or articles are enclosed “ in bottles “ or other vessels of glass, pottery, tin, or other metals or fit ma- “ terials,” and they are closed by “ the usual means of corking, “ airing, luting, or cementing.” When large vessels are employed, corks are used “ formed of pieces glued together,” so that the “ pores of that substance shall be in a cross direction with regard “ to the aperture into which such corks are to be driven.” Mak¬ ing use of vessels with “ stoppers fitted, or ground with emery, or “ screw caps with or without a ring of leather or other soft sub- “ stance between the faces of closure, and also of corks or cross “ plugs or covers of leather, cloth, parchment, bladder, and the “ like.” Second, Immersing the vessels which “ have been thus charged “ or well closed ” completely in cold water, gradually heating to boiling, and continuing the boiling “ for a certain time.” “ Yege- “ table substances are to be put into the vessels in the raw or crude “ state, and animal substances partly or half cooked, although “ these may be put in raw.” The vessels are opened when their “ contents shall be wanted for consumption.” Lastly, Although the application of the water bath as described is preferred, “ an oven, or a stove, or a steam bath, or any other “ fit situation for gradually & uniformly raising the temperature of the same, and suffering them to cool again,” may be em¬ ployed ; and also the “ aperture, of the vessel, or a small portion “ thereof,” maybe left open, and is closed when “the effect of the ** heat has taken place.” CP rinted, 3d. See Repertory of Arts, vol. 19 (second series), p. 193; and Rolls Chapel Reports, 7th Report, p. 208.]
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