--Contributed by W. A. Jaquythe, Richmond, Cal.
** How to Make a Thermometer Back in Etched Copper [246]
Etching copper is not a very difficult process. Secure a sheet of
No. 16 gauge copper of the width and length
[Illustration: Copper Thermometer Holder]
wanted for the back of the thermometer. In the design shown the
extreme width is 3-1/2 in. and the extreme length 7 in.
Draw a design. The one shown is merely suggestive. The worker may
change the outline or proportions as desired. The decoration, too,
may be changed. The essential thing is to keep a space upon which
to place the thermometer. This design is in what is known as
two-part symmetry. A line is drawn down the paper and one-half of
the outline and decoration worked out. This done, the paper is
folded along the center line, a piece of carbon paper is inserted
between the folds and the design transferred on the inner surfaces
by tracing with a pencil over the half of the outline previously
drawn. Trace the design and outline upon the metal, using the
carbon paper.
Cut out the outline with metal shears and file the edges smooth.
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