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MANAGERS AND PROJECTIONISTS 667
The Power's Projector
THE Power's projector is now only made in one model for use in North America. That model is the Power's 6B Improved Model, which may be had with either of the following equipments:
The 6B ordinary arc lamp and lamphouse.
The Type E lamphouse and ordinary arc lamp.
The high intensity lamp and lamphouse.
The Powerlite reflector arc lamp and lamphouse.
The incandescent lamp and lamphouse.
In addition the 6A model is made for the export trade, which includes South America, and Central America and Mexico in North America.
The Type E lamphouse is substantially constructed, large and well ventilated. In the right hand back corner is a small incandescent lamp, so arranged that it lights when the lamphouse door is opened, and is switched off when the door is closed.
The condenser mount used with the Type E lamphouse is illustrated in figure 234. Its lenses are carried in a metal holder which is calculated to equalize the expansion of the thin edge and thick center of the lens, and thus reduce breakage. The lamp rack-bars are three-quarters of an inch square. The bearing through which they slide is 2l/± inches long. The surfaces which grip the carbons are VA inches long, of cast iron, dull nickeled. The carbon clamp screws are 5/16 inch in diameter ; the leverage for clamping the carbons is ample.
USE GRAPHITE. — The carbon clamp screws and other working parts of the lamp must be kept lubricated with powdered graphite. A dry, unlubricated carbon clamp screw is an abomination and a nuisance. The construction of the lamp, as a whole, is rigid and good. On the front of the bearing carrying the rack bars is a heat shield of asbestos. The lamp has all the necessary, usual adjustments. The dowser is inside. It has two handles so that it may be operated from either side of the projector. These handles are at A, Fig. 234, which figure shows the condenser holder tipped down to get at the lenses. When tipped back up it is locked into place