MODEL BOILERS - John-Tom

MODEL BOILERS . A booklet devoted to the construction of Get stampings rather than castings, as the MODEL BOILERS may well open with a few first are more homogeneous, and therefore cautionary words, as the dangers connected can be somewhat lighter. with steam-raisers are very real; and though Flanging boiler Ends MODEL - boiler explosions are fortunately rare, if they do occur they may be extremely To make a good job, a plate for an end should disastrous. be screwed to a circular block of hard wood (oak or boxwood), having an outside diameter Therefore the following warnings: less than the inside diameter of the boiler (1.) Do not use tins or thin sheet iron barrel by twice the thickness of the metal of for BOILERS . One cannot tell how far the end, and a rounded-off edge. The plate internal corrosion has gone. The scaling must be annealed by being heated to a dull of 1/100 inch of metal off a "tin" is red and dipped in cold water. The process obviously vastly more serious than the must be repeated should the hammering same diminution in the thickness of, make the copper stubborn.

MODEL BOILERS Figure 79 shows a great improvement in design. The boiler is entirely enclosed, except at one end, so that the hot gases get right

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