Richardson's handbook of projection (1927)

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HANDBOOK OF PROJECTION FOR Meters, Electric Describe: roughly, the action of an electric meter... 265 How may you test your meter ? 265 How would you read a meter ? 266 Are all meters to be read directly as per the dial showing ? 267 Miscellaneous How would you clean a projector mechanism after a film fire? 291 How may Centegrade thermometer readings be reduced to Fahrenheit?..., 512 Centigrade and Fahrenheit Scales 481 Melting Point of Metals 481 Reflective Powers of various surfaces 481 Common Fractions in calculations 481 Newspaper and Fire Danger .A. . . 470 Motor Generators and Mercury Arc Rectifiers (See "Current Rectification," page 493, Vol. II.) Optical Terms — Their Meaning What is meant by the "Principal Axis" of a lens?.. 126 What does "perpendicular to" mean as applied to optics ? 126 Explain the meaning of the term "Conjugate Foci". 127 What is meant by "Refraction" as applies to optics? 127 What is meant by "Angle of Incidence"? ... 129 What is the "Angle of Refraction" ? 129 What is meant by "Working Distance" ? 49 What is meant by "Equivalent Focus" (E. F.) ? 129 What is meant by "Spherical Aberration"? 129 What is "Chromatic Aberration" ? 130 What is meant by "Projection Angle"? 20, 255 What is "Projection Distance" ? 38 What is a "Condenser"? 25,164 What is a "Light B-eam"?. 32 What is a "Light Ray"? 32 What is meant by "Working Distance"? 49 What is the meaning of "Refractive Index"? 40 What is meant bv "Regular Reflection"? 222 What is meant bv "Diffuse Reflection"? 222 What is meant by "Semi-Diffuse Reflection"?....-. 222 What is meant by "Fade-Away"? See "Distribution of Light" 225 xlii