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611 HANDBOOK OF PROJECTION FOR
but no matter what the reason may be for such failure, the result is bad, and justification of the investment necessary for proper arc control is more than ample.
In considering matters of this kind, the theatre management will do well to remember that after it has invested anywhere from a few thousand to a half million dollars in a theatre building, and has paid large sums for its furnishing in the finest possible way, its ventilation in the most complete possible manner and its artistic lighting and has paid large sums for film service rental, it cannot possibly be good business to attempt to save a comparatively small sum of money by the investment of which the very heart of everything, the projection light source, will not only operate more economically and efficiently, but also will give a more even, constantly brilliant screen illumination.
We strongly advise all exhibitors using an arc light source for projection to install arc controls.
FULCO SPEEDCO AUTOMATIC ARC CONTROL is the
re-designed and improved arc control formerly known as the Speedco.
The Fulco Speedco Automatic Arc Control is of the automatic type. It makes use of two basic principles, viz: Mechanical and electrical. The device is mechanically wellmade, and the experience of years has proven that it may be depended upon to perform the duty for which it is designed.
By referring to Plate I, you will see that the control consists of a small motor, A, directly connected through a flexible coupling to the controller mechanism, B. Controller B is connected to the arc lamp through the mechanism and rods illustrated in Plate II. The general assembly of the whole is shown in Plate V.
The controller is illustrated, in detail, in Plate I, in which 6 is the fuse box, 5 the snap switch which operates motor A, 8 the conduit protecting circuit connecting motor A and fuse box 6, 7 the conduit protecting circuit connecting the fuse box to the projector table switch, as shown in Plate IV. Beside the fuse box, to the left in Plate I, is the disassembled assembly illustrated in Plate II, in which 2 is the hand carbon feed wheel, 3 the thumb screw which locks the hand control to the mechanical control, 12 the gear operating the lamp carbon feed rod which is driven by gear 6, Plate II. Rod 2 and 2A in Plates I and II are the same, they being the rod which connects the control to the lamp carbon feed handle. This rod is adjustable in length, because rod 2A, which is