American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 88
t criticised unmercifullyany plan offered, was always open to convic-tion on a reasonable demonstration. Mr. Howard did invent the swing rest, andas the principle is founded on true geometri-cal premises we will try to give an outline ofits general construction—premising that thepoint of departure… … sive, when the operations are repeated aninfinite number of times. The setting is apiece of punched brass, a little lar«^er thanthe size required when finished, and is heldin the jaws of tlie spring-chuck as any otherpiece of work, by the external circumference.A hole is drilled in the blank first,…
Clocks and watches
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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-376-43.webp)
