(Lathe useful here.)
The Steam Pipe is 15 inches (or more) of 5/16-inch copper tubing, well
annealed. To assist the bending of it into a ring one needs some circular
object of the same diameter as the interior diameter of the ring round
which to curve it. I procured a tooth-powder box of the right size, and
nailed it firmly to a piece of board. Then I bevelled off the end of the
pipe to the approximately correct angle, laid it against the box, and drove
in a nail to keep it tight up. Bending was then an easy matter, a nail
driven in here and there holding the pipe until the ring was complete. I
then soldered the end to the standing part, and detached the ring for
flattening on one side with a file and emery cloth. This done, I bored a
hole through the tube at F to open up the blind end of the ring.
Attaching the ring to disc D is effected as follows:--Tin the contact
faces of the ring and disc pretty heavily with solder, after making poppet
marks round the guide circles so that they may not be lost under the
solder. The ring must be pressed tightly against its seat while heating is
done with the lamp.
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