Hallberg, Josef Henrik, 1874- · New York city, The Moving picture world · leaf 152
the resistance unit composed of a resistance wiremounted in zigzag form on small insulating buttons, sup-ported by a suitable metal frame, enclosed in a ventilatedmetal case. The illustration shows the beginning andend of the resistance wire attached to proper binding postsor terminals supported on… … Fig. 83 suitable openings with proper bushings should be pro-vided in the metal case, through which the asbestos cov-ered copper cables may enter for making connection withthe binding posts. It is evident with such a rheostat asdescribed in the illustration, if the proper size wire isused, would be…
Motion picture theaters · Electric lighting
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-161-57.webp)
