Richardson's handbook of projection (1927)

95(5 HANDBOOK OF PROJECTION FOK is some means to indicate the positions, although this :.s not absolutely necessary. The design of the device indicates extreme simplicity, the entire unit consisting of one one special % H. P. repulsion type motor, worm reduction gear, base 6" double V pulley and rope guide. Floor space is 10" x 26" x 15" high. The Weaver is fully guaranteed by the manufacturers to give perfect satisfaction. THE VALLEN CURTAIN MACHINES AND NOISELESS CURTAIN TRACK The Vallen machine for handling theatre curtains is made in three sizes, viz the "Junior," which is made to handle small curtains, "The Vallen," which will handle almost any size curtain if it be properly installed, and the "Vallen Special," which is a heavy duty machine, designed to automatically handle any object which requires from 75 to 225 pounds pull or pressure to set it in motion. Figure 376 shows the general appearance of the machines, which are all essentially the same, except as to size and power. These machines are equipped with remote controll switch, so that thy may be set into motion from any desired station in the theatre, at which point they may also be instantly stopped, or revrsed. In other words, from the operating station the man in charge may close the curtain or open it, or he may start to close or open it, and may reverse the motion at will at any point. Also the power may be quickly disconnected and the curtain operated by hand power. The machines are well made, and have been thoroughly tested out by some years of service. They are commended to your favorable consideration. The Vallen Electrical Company, Akron, Ohio, also market a noiseless curtain track, which is shown in figure 377. It is not a box or steel track, but consists of two carefully selected maple rails, chemically treated and anchored to metal