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546 HANDBOOK OF PROJECTION FOR
transformer, and the current rectification is performed entirely by the commutator, the only operating power required is a small motor to rotate the armature against the friction of its brushes and the shaft bearings, hence the power consumption is negligible. The operation of the device is therefore highly efficient.
The machine is a single phase unit and, due to its small power consumption, may operate either from a power or a lighting circuit, provided the wires be of sufficient size to accommodate the arc amperage, plus the small power used in the machine itself. It has a unity power factor, which is an important item in computing power rate. It may be connected to a 3-phase supply by using only two legs of the circuit. The brush area is such that the machine will carry 100 per cent overload for a considerable period of time.
CHANGE-OVER., — The machine automatically supplies the required additional amperage when one arc is burning and the second one is put into operation, so that the first is not affected.
The Syncroverter is very simple in contsruction and operation. Its makers claim it to be very nearly entirely fool proof.
FOR EMERGENCY me transformer, which is a part of the machine itself, may be used to supply A. C. at the arc.
CAPACITIES.— The Syncroverter now (1927) is supplied in two models, and each model in two sizes. Type 25 has a normal rating of 25 amperes. It is capable of handling two 25 ampere arcs in multiple. When the second arc is struck the operation of the first will be in no wise affected. This type is entirely self contained.
Type 25-B is the same as the Type 25, but is supplied when the machine is to be installed outside the projection room, as it has a separate panel carrying ammeter and amperage controls, for installation within the projection room.
Type 26-S has a normal rating of 50 amperes. It will handle two 25 ampere projection arcs without overload, or one 50 ampere spot. It is recommended where two reflecting arc lamps and a 50 ampere spot are used. This type is made with projection room control panel, carrying ammeter, amperage control and spotlight switch.
FOUNDATIONS NOT REQUIRED.— Syncroverters run without vibration, hence no foundation is required. They are made for any line voltage from 100 to 550.