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615 HANDBOOK OF PROJECTION FOR
SUPPORTING STANDS.— Plate V illustrates different types of supporting stands. At the left the controller is seen on the floor, in the center raised about six inches, and at the right it is raised up about two feet, though the last stand can be made up, on special order, to any height required, as the supporting column can be made longer. This brings the control to any desired height, and so accommodates those extreme conditions which are at times met.
Either type of stand may be had with the outfit at a small added cost, remembering that the rod which connects the controller with the carbon feed handle is adjustable as to length, therefore, the use of the lower stand is optional, but the last or higher stand requires a telescoping rod of about half the length of those ordinarily supplied.
We advise the last or higher stand, as this raises the device out of the dirt, and looks neater ; also it affords a better operating position, as it is not necessary to stoop over when making an adjustment. The stands are constructed so as to catch and hold any oil which may leak from the controller, thus keeping the floor clean and free from oil.
CONNECTING THE CONTROLLER.— When the controller is unpacked, examine the packing material very carefully to make sure it contains no small parts. The shipment will consist of the following: the controller, motor and base connected in one unit, with the necessary switch, fuse box, fuses and wire circuits protected by a flexible conduit, steel rod and tube, universal joint, fibre knobs and gearing necessary to attach the gear to the carbon feed rod of the arc lamp.
After unpacking and inspecting the parts, proceed as follows : First, set the controller and motor A and B, Plate I, on the floor immediately beneath the carbon feed handle of the arc lamp, though if necessary the controller may be set a little to one side, or a little back of the carbon feed handle of the arc lamp. This may be necessary in some cases where lamp controller handles interfere with the rods 2 and 2A, Plate I, or where the conduits coming up out of the floor prevent locating the controller in exactly the desired spot. It is, however, desirable that rods 2 and 2A, be as nearly perpendicular as possible, because universal joints 13, Plate II, will not work properly if rods 2 and 2A are set at too great an angle. This idea is illustrated in Plate V.
Switch box and switch, 5 and 6, Plate I, should be attached to the projector table switch casing, either on its under side, or to the side of the casing. This may be done by drilling