CANNING SIMPLIFIED.

Otago Daily Times, Issue 15707, 8 March 1913, Page 5

CANNING SIMPLIFIED.

SUCCESSFUL DEMONSTRATION.

A demonstration was given by Mr F. \V. Grigg, representing tho manufacturers, with tho " National" canning outfits, yesterday afternoon on tho promises of Messrs Wright, Stephenson, and Co., High street. There were about 50 ladies present, and all evinced a very great deal of interest in the demonstrations given by Mr Grigg and in . the explanatory comments he made. Tho . process of preserving fruit and vegetables by the "National" method appears both simple ■ and effective, although there is nothing very new about it. Tho principle of canning has been practically tho same for many years and has been effected by placing tho goods in air-tig'ht receptacle's apd subjecting them to heat sufficient, to kill the form'ent germs. The process of sterilisation has not at any f 4: rao_been familiar to any but thosi comengaged in tho canning industry, in- "-,,0t alone may be mentioned A tat la not usually known in connecikin with preserving fruit and vegetables, JJid that is. that the temperaturo of water boiled in an open vessel never rises beyond 212deg Fahrenheit under any condition of heat. But onco confined, the liquid in a steam-tight vessel will, under tho influence of fire, riso to a much .greater temperature, and tho addition of sugar produces a somewhat similar result, for sugar makes tho water denser, and under such conditions tho temperature will inereaso to / 240deg., or even more. This seems to give tho key io preserving, and to tho homo practices followed by tho housewife in the use of syrup, in her preserving operations. All this and much more was elaborated by Mr Grigg yesterday, and his demonstration with &n .apparatus capable of dealing with preserves sufficient to fill 150 glass bottles in the day, or from ZOO to £00 21b cans, were most successful. The apparatus consists of a boiler, with thermometer and safety valve, an inner receptacle, and a number of bottles. Hennetioally sealed, ihe fruit or vegetables ■treated will keep without fail for a minimum period of six months, or, indeed, for as long as is desired.

Tho following extract from tho book of instructions gives a very fair idea of what the apparatus is:—"The National canning outfits, including homo canners, are tho only articles of this kind now mado in small Bize3 for small factories or homo canning;. AVe admit frankly that wo havo no new invention nor any untried scheme. These boilers, are simply built on tho samo plan as tho so-called steam chests or prooees kettle that you will find in every commercial panning factory in tho world, only wo havo adapted them for convenience and practioal use in the home, on the farm, or in tho regularly equipped canning factories."