The standard electrical dictionary : a popular encyclopaedia of words and terms used in the practice of electrical engineering (1898)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · London : Crosby Lockwood and Son · leaf 419
grad-uated bar G, and at D is an index plate to show the angle at whichthe spindle carrying the mirror is set. __ 414 STANDARD El.BCTRlCAIv DICriONARY. Dr. J. Hopkinson in his dispersion photometer uses a double con-vex lens. This gives a focal image of the arc-lamp between thelens and screen,… … Fig. 262. Rumfords Shadow Photometer. intensity of the two lights is estimated by the intensity or strengthof shadows of the same object which they respectively cast.
Electricity
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Vnderweysung der Messung : mit dem Zirkel vn[d] Richtscheyt in Linien, Ebnen vnnd gantzen Corporen (1525)](https://img.insideoutlibrary.com/img/200/ia-vnderweysungderm00drer-106-206.webp)
