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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
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