The diaphragm, which should be of thin ferrotype tin, should be soldered to the box. [Please select]
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A disk of thin sheet-iron, such as is used by photographers for tintypes (Ferrotype), should be cut to the diameter of the can, taking care not to bend the iron. [Please select]
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The diaphragm C, which is the essential part of the instrument, should be made as carefully as possible from ferrotype tin, commonly called tintype tin. [Please select]
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