Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 579
be presented atany desired angle, and the observer hasonly to adjust the pointer until thespot on the Bunsen screen disappears.The pointer will then indicate the illu-mination. It will be observed thatthe adjustment was carried out entirelyby varying the resistance, the lampbeing stationary. This,… … General View of the Lightometer. 001 to -3 foot-candles, correspondingwith tlie application of 4 volts and2 volts respectively to the standardlamp. By looking at the scale from tlieoutside one measured illumination inthe ordinary way. But it had beenshown, in the valuable work by Mr.Dow and Mr.…
Lighting
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