Electrical and scientific instruments and apparatus : november 20th, 1899 (1899)
Elmer G. Willyoung & Co · New York : E.G. Willyoung · leaf 175
Fig. 144. DuDDELL Oscillograph. 170 … Fig. 145. DuDDELL, Oscillograph, with Lantern and Mirror forStatic Curves. APPROXIMATE DATA OF THE DUDDEEEOSCILEOORAPHS. Resistance of Field Coils in seriesat 15° C Normal Exciting Current with thecoils in series Normal tension on strips in SingleOscillograph High FrequencyPattern. 360 ohms 0.25…
Electric apparatus and appliances · Equipment and supplies
Internet Archive · Medical Heritage Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-174-72.webp)
