Journal of the Franklin Institute; devoted to science and the mechanic arts (1826)
Franklin Institute (Philadelphia, Pa.) · Oxford, Eng. [etc.] Pergamon Press [etc.] · leaf 507
ityrequired. They are regulated by a small weight attached to the spring,and raised or lowered until the number of vibrations or desired toneis produced. This can be done easily and quickly, although the instru-ments may be any number of miles apart—say between London andParis, or Ireland and… … A. Key Board. B. Vibrating Spring. C. Electro-magnet. D. Detent. E. Tvpe-wheel. F. Ink Roller. G. Paper Printed upon. H. Revolving Shaft. I. Revolving Arm or Circuit Closer. The Magnet.—The Hughes magnet is of peculiar construction. Apermanent magnet polarizes the cores of an electro-magnet, and…
Science · Patents · Meteorology · Technology
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-887-571.webp)
