BSTJ 3: 1. January 1924: Photomicrography and Technical Microscopy in Its Application to Telephone Apparatus. (Lucas, Francis F.) (1924)
leaf 46
BELL SYSTEM TECHNICAL JOURNAL 142 Fig. J (1)) Showing inappreciable depth of carburized zone, and a large non- metallic inclusion in the steel. Inclusions of this sort denote poor quality or dirty steel. Magnification, 100 X. … Fig. K. Steel of 1.5% carbon heated to 825° C. and quenched in oil. This medium-power photomicrograph at 100 X really tells very little about the steel, except that it possesses a fine structure.
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.
