CAN ALL FOOD THAT CAN BE CANNED 
15 
U 0 
Canning in Tin. Fig. 29. Wiping juice and syrup from groove. Fig. 30. Applying cap and wiping groove 
with brush dipped in soldering fluid. Fig. 31. Placing clean hot capping steel on can and melting solder into groove. 
drives out the air which will cause the can to 
bulge, giving it the same appearance as when 
spoilage has occurred. After exhausting, 
the cans are removed from the sterilizer and 
the vent hole is closed. The cans are re- 
turned to the sterilizer and sterilized, follow- 
ing the time-table given on page 2. At the 
end of the sterilization period remove cans 
and plunge immediately into cold water. 
Do not stack cans closely until cold. 
After packing, label each can by writing 
the name of contents on the side. If in- 
tended for sale affix a label just before shipping. 
Do not allow paste to touch the can, as it 
will cause the tin to rust. The label should 
be large enough to encircle the can and over- 
lap at the edges. Put the paste on one of the 
overlapping edges and draw label tightly 
around can, pasting the two edges together. 
To seal, wipe top of can clean and dry 
and then put the cap in place, applying flux 
carefully to the groove. Do not allow the 
flux to enter can, as it is poisonous. Hold 
the cap in place with the center rod and lower 
the hot capping iron squarely and firmly on 
the solder rim of the cap, or melt a little 
solder in the groove by holding the solder wire 
against the lower part of the capping steel. 
Revolve the iron to melt the solder and seal 
the can. Lift the capping iron with a sudden 
twist, holding the center rod in place. When 
solder has hardened remove center rod. 
To tip, dry top of can and apply flux to 
the hole in the center of the cap. Hold the 
solder in the left hand, brush it with the hot 
tipping iron so only a bead will drop and 
close hole. 
The steels must be kept clean and well 
coated with solder. To do this, if capping 
steel is rusty, clean with a file, brick or emery 
paper. To tin the capping steel heat and 
dip in flux, then heat again until red hot and 
dip in sal ammoniac and solder until well 
coated. Sal ammoniac is made by mixing 
equal parts of dry sal ammoniac with solder 
chips. Coat the tipping copper in same way. 
Flux is made as follows: To muriatic acid 
add strips of zinc until no more will dissolve. 
Strain through a cloth and when ready to use 
add an equal quantity of water. Flux which 
is used for tinning the tools should not be 
used for soldering. 
Canning in Tin, continued. Fig. 32. Turning steel to distribute solder. Fig. 33. Raising steel to allow 
solder to harden after pressing down on center rod. Fig. 34. Sealing with drop of solder after exhausting can 
and wiping vent hole. 
