t\0. U. W … published by The Keystone, THE ORGAN OF THE JEWELRY AND OPTICAL TRADES, 19TH & Brown Sts., Philadelphia, U.S.A. THE OPTICIANS MANUAL VOL. I. By C. H. Brown, M. D. Graduate University of Pennsylvania; Professor of Optics and Refraction ; formerly Physician in Philadelphia Hospital; Member of…
Clocks and watches
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![An illustration from Kunstrichtige Schreibart : allerhand Versalie[n] oder AnfangsBuchstabe[n] der teütschen, lateinischen und italianischen Schrifften aus unterschiedlichen Meistern der edlen Schreibkunst zusammen getragen (1655)](https://img.insideoutlibrary.com/img/200/ia-kunstrichtigesch00fran-60-129.webp)
