Cinematographic annual : 1931 (1931)

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PROJECTION ARCS 127 decreases again near the edge of the crater. If the carbon were solid instead of cored, there would be no dip in the intrinsic brilliancy at the center of the crater. However, the core is necessary to furnish arc-supporting materials and to maintain the crater position constant with respect to the carbon. Without it, the current would have to be reduced materially and the crater would travel around the end of the carbon resulting in a very unsteady light on the screen. lOUUU t •10 M.M. 14000 x 12 M. M. '13 M.M. o 14 M.M. 12000 10000 t> 8000 DC o A 6000 Ld -J Q Z < 4000 2000 S.R.A. POSITIVE CARBONS CURRENT o R2-< u< ) 1( D 2 0 3 0 4 0 50 f'9 2. Variation of candle-power of the crater with respect to the current.