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92
BRITISH KINEMATOGRAPHY
Vol. 16, No. 3
Type 170 gives 21 times as much light, goes far to meet the need for a more powerful light, while effecting an economy in current consumption.
Modernising Existing Arcs
A serious attempt was made to incorporate features in the design of ' The Brute " which would improve its performance as an arc, improve the
Fig. I. Type 460 Compact source spotlight with remotely controlled shutters.
Fig. 2. Type 46 1 Compact source floodlight.
constancy cf the light, and reduce the work entailed in handling and maintaining it. Full advantage can only be obtained from some of these new features if all the arcs in a studio are so fitted, and, in view of the capital investment involved, attention has been turned to the possibility of economical conversion of existing lamps.
The result is " The Junior Brute." Basically it remains the well-known Type 170 because the mechanism and lens are retained. The back casting of the lamphouse is changed for one similar to " The Brute " and the mechanism transferred to it. It incorporates all the features of " The Brute," the arc image and graticules, carbon warning light and polarity indicator, burning hours counter and also telescopic feed control handles, which do not project as the mechanism moves into the spot position. The increase of total weight is negligible, but the demountable mechanism results in the lamp barrel and mechanism being separable into two parts weighing 172 lbs. and 100 lbs. respectively.
Dr. Truefitt : Cculd the speaker tell us what the light outputs are which compare as 2\ to 1 ?
The Author : The relative light output of 'k The Brute " at 225 amps, and the
150 amp. lamps depends partly on the position of the mechanism as regards spot and flood. Jn the spot there is 2.1 times as much light, and in the flood the ratio is possibly 3.1.
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