BSTJ 3: 1. January 1924: Photomicrography and Technical Microscopy in Its Application to Telephone Apparatus. (Lucas, Francis F.) (1924)
leaf 44
BELL SYSTEM TECHNICAL JOURNAL 140 … Fig. I. A further illustration of low-power photomicrography in the study of telephone parts: . . (a) Intermediate pinion of calling dial. Diameter of pivot .050 inch. Magnification, 14 X. (b) The effect of laboratory wear tests on small shafts. Magnification, 4 X.
Specimen · Photomicrography · Technical · Eyepiece · Objective · Magnification · Light · Microscopy · Microscope · Color · Arc lamp · Illuminating train · Technical microscopy · Polarized light · Bell system · Numerical aperture · Resolving power · System technical · Technical journal · Automatic arc
Internet Archive · Public domain (published before 1931). Free to use for anything.
