Generally speaking, (3) is to be preferred, as the simplest.
The belt may be made out of a bootlace or fairly stout circular elastic. In
either case the ends should be chamfered off to form a smooth joint, which
may be wrapped externally with thread.
FINAL HINTS.
All parts which have to be fitted together should have matching marks made
on them with the punch. To take the parts of the valve chest as an example.
As we have seen, these should be soldered together, finished off outside,
and drilled. Before separating them make, say, two punch marks on what will
be the upper edge of the valve plate near the end, and two similar marks on
the chest as near the first as they can conveniently be. In like manner
mark the chest cover and an adjacent part of the chest with three marks. It
is utterly impossible to reassemble the parts incorrectly after separation
if the marks are matched. Marking is of greatest importance where one piece
is held up to another by a number of screws. If it is omitted in such a
case, you may have a lot of trouble in matching the holes afterwards.
Jacket the cylinder with wood or asbestos, covered in neatly with sheet
brass, to minimize condensation.
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