Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 236
The two carriages which carry the grating and camera areidentical in construction, and are shown in Fig. 83, in planand side and end elevation. AA are two iron castings, 12inches long, 2 inches wide, and \ inch thick; they widen, asshown, at the top, in order to offer more substance to thescrews.… … THE RULED GRATING IN PRACTICE 219 down on to the planed top edges of the side pieces by fourscrews on each side. The two wheels CC are gun-metal, andare about 2 inches in diameter, and are mounted on |-inchsteel axles. These wheels are supported by the |-inch set-screws DD, which pass through…
Spectrum analysis
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