What people are saying - Write a review
We haven't found any reviews in the usual places.
Illumination and Brightness Measurement
12 other sections not shown
Other editions - View all
accuracy accurate adjusted aircraft alternating amplifier angle anode applied arranged axis balance base beam bearing brightness calibrated camera carried causes cell Chapter circuit clock coil complete connected consists correct depends described designed developed direction effect electrical electrons employed example field fitted fixed force frequency give given glass ground inch increases indicator instrument known length lens light load machine magnetic material means measured mechanical meter method mirror motor mounted movement moving object observations obtained operation optical oscillator passes photographic placed plate position possible pressure principle produced proportional pulse radiation radio range reading recording reflected relative resistance rotation scale sensitive shown shows signal specimen speed standard star supply surface telescope temperature tube turn unit usually valve vertical voltage wind wire