een put in place and rests on the entire surface of the ring, the wooden insulator I and the weights W (200 pounds or more) are put on top of the heated block. This is permitted to stand for at least 10 or 15 mhmtes, the longer the better. The apparatus is tlien disassembled and the excess rubber… … Fig. 24.—Section of apparatus for mounting rubber diaphragms in the diaphragm than is at all necessary. No great amount of care need be exerted in constructing the apparatus. The adjustable table need not be elaborate, because no two diaphragms can be mounted exactly aUke. Further- more the amount…
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