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Lädt ... Drake’s plate of brass authenticated; the report on the plate of brass, by Colin G. Fink and E. P. Polushkin. With a foreword by Allen L. Chickering and a biographical note on Professor Fink by Joel H. Hildebrand California Historical Society.…von Colin G. Fink
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"An interesting detail which we observed in the lettering was the 'parallel lines,' a series of fine, parallel grooves located near many of the letters. (Figs. 6, 7 and 8.) In most cases these lines were parallel to the letter grooves. Sometimes the lines were so close to each other that two or three of them could be counted in the width of one millimeter. The closeness of these lines to each other and their strict parallelism indicate that they could not have been made by hand one by one. If they had been made with a hand chisel (which is most probable), a special holder for the chisel fastened to a bench might have been used. It seems most plausible that these lines represent a series of marks in the brass surface left by the cutting edge of the tool in its gradual approach to the final position at which the tool edge was driven into the metal. Such parallel marks can be made today with a modern pneumatic tool but not readily with a hand chisel. We were not able to duplicate such parallel lines on a piece of modern brass using a hand chisel and we found no explanation for these parallel lines in an old treatise on methods of engraving as practiced in Drake's time."
Oops. An interesting bit of ephemera from 1938. ( )