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362 MOTION PICTURE HANDBOOK
The economizer is supplied for voltage ranging from 100 to 120 and 200 to 220, and may be constructed for 25, 35, 40, 50, 60, 120, and up to 140 cycles. The 110 volt economizer lines are usually connected to terminals 1 and 2 when the voltage is 100 to 105; to 1 and 3 between 105 and 115, and to 1 and 4 if between 115 to 120. If it be a 220 volt economizer then connect to 1 and 2 for 220 volt supply and to 1 and 4 for 240.
The manufacturer supplies the following data for the Hallberg economizer.
Line fuses Line Line Line watts Amperes
required. Voltage. Amperes. per hour. at arc.
Regular Type — 30-40 Amperes.
20 110 18 1,400 30-40
10 220 9 1,400 30-40
Standard Type— 45-55 Amperes.
30 110 25 1,800 45-55
15 220 13 1,800 45-55
Special Type — 60-80 Amperes.
40 110 35 2,200 60-80
20 220 18 2,200 60-80
Searchlight Type— 125-150 Amperes.
80 110 75 4,200 125-150
40 220 35 4,200 125-150
There are four types of this device, viz: the "Regular," the "Standard," the "Special," and the "Searchlight." The Regular type is designed for stereopticon and very light motion picture theatre work, where the picture is small and the performance not continuous.
The Standard type is recommended by the manufacturer for ordinary motion picture theatre performances. It delivers a maximum of approximately 60 amperes at the arc.
The Special type is made for those who desire an amperage in excess of 60, and is size the author recommends to those who want brilliant screen illumination.
The Searchlight type was ordinarily designed for Kinemacolor work, but it is now offered to the regular motion picture trade. It has a maximum capacity of 150 amperes.
Where the Searchlight is used it is well to use either threequarter or seven-eighth inch cored carbons. Where the Special and Searchlight economizers are used the asbestos covered cable should be No. 4 for the Special, and No. 2 for the Searchlight. For all other economizers they should be No. 6.