th other kinds of illuminants. vanometer forced back to the left until it reaches the and twenty-four inches therefrom. The switch put- It forms a ready and convenient standard for use in the zero point; then the batteries are exactly balanced, laboratory, or even for use in gas works, and is an… … Fig. l.-ELECTRICAL APPARATUS FOR MAKING PHOTO-SEffSITOMETRIC TESTS. candle; at this zero reading we have also a constant upon the screen for twenty seconds; it is instantly Mr. Edison and the Society of Amateur Photogra- number of volts of electro-motive force. stopped by turning off the switch.…
Patented · Munn · Patents · Scientific American · Contained · Candle power · Brass rod · Special Construction · Ten pounds · Horse power · Sulphuric acid · Wheel base · Address munn · Bell telephone
Internet Archive · Public domain (published before 1931). Free to use for anything.
