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(12) The tops are placed on the cans and soldered, after which they pass
over runways under numerous jets of cold water, which cools the
solder.
(13) The central vents of the tops, which are open until this stage of the
process, are sealed.
(14) The cans are placed in open steel trays, or coolers, as they are called,
which are immersed in tanks of hot water; air bubbles, escaping, call
attention to leaking tins, which are removed and passed on to the leak
menders for immediate repair. The contents of a mended can are as
good as any other.
(15) The trays containing the cans are then placed one upon another on
cars and run into a track into steel retorts, where the salmon is subjected
to the first cooking. This requires about 50 minutes under
steam pressure of 6 lbs., equal to a temperature of 220° Fahrenheit.
(16) The cans are withdrawn and vented by piercing the tops with small
brads to allow the hot air to escape. After this the second vent
holes are soldered.
(17) The cans are placed in another retort for the second cooking under
steam pressure of 12 lbs., or at a temperature of 240° Fahrenheit.
(18) After the second cooking the cans are cleansed by scouring them in
a tank of strong lye and then washing in boiling water and lastly
in cold water, after which they are allowed to stand for several
weeks, during which time they are repeatedly tested and examined
for defects. All such cans are removed.
(19) Finally they are dipped into lacquer to prevent rust and are then
cased.
It will be noticed that the cans are pierced twice, and consequently such
a fact in this method of canning is not the suspicious circumstance, which
writers on tinned goods usually hold double piercing to be.
Dirty Milk Vessels.—Special attention was paid to the state of the
milk measures used by purveyors of milk, and it is satisfactory to find that
they were generally in a cleanly state. The Chief Inspector has during the
last two or three years made it a regular practice to point out to them the
necessity of keeping their measures thoroughly clean. He used to find