Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 54
)late, the ordinary steelplate which is used for drawing heavy wire, and the rubv plate, whichis used in drawing gold and silver wires, where it is desirable to have … them of uniform thickness. The iridium plate is made somewhatsimilar to the ruby plate, consisting of a piece of iridium which hasbeen countersunk and drilled in the usual way to the size of the holerecjuired, and set in a l)rass plate, where it is firmly held by a bushing.This plate is now coming…
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