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REPORT OF COMMITTEE ON PROGRESS
DURING the period since the last meeting of this Society, there has been progress along several lines of the motion picture industry. The condition of any line of activity is reflected, to a great extent, in the improvement in materials, methods and equipment entering into the product. If a comprehensive report of these improvements is made, it is a measure of the growth and development of the industry as a whole. The report presented is, we fear, more or less incomplete, and in this respect it fails as a true indicator of the scope of the work coming within the field of interest of the Society of Motion Picture Engineers.
Projectors :
Among the improvements in standard projectors may be mentioned the use of a pilot lamp or trimming lamp in the lamp house, controlled by a door-switch. W^hen the door of the lamp house is closed, the pilot lamp is out, but as soon as the door is opened for replacing or adjusting carbons the lamp is lighted.
The window in the lamp house door for observing the arc, has been changed into a pin hole camera so that an image of the arc is shown on a piece of ground glass. The new device fits into the holder for the old style glass.
The operation of two machines in a projection room is being made much more convenient than heretofore by the addition of double control handles. These double handles permit the projectionist to control easily the machine at his right.
The spot is also shielded by a double shield which protects the eyes of the projectionist on either side of the machine.
An improved fire guard has been developed for the film gate, which limits the burning of film to a single frame when left in the beam of light.
One manufacturer has made an improvement in the intermittent movement by the use of sleeves or rollers on the pins engaging with the cam thus providing rolling friction in place of sliding friction. The rollers are held in place by a plate on the back of the cam.
A portable projector with a solid bakelite case in place of the usual leather-covered metal case, has been placed on the market. This provides a light weight, fire-resisting construction of good appearance.
Right Angle, Automatic Projection Arc.
With the idea in mind of increasing the general illuminating efficiency of the projection arc, a right angle, high intensity arc lamp has been perfected. This lamp employs a positive carbon rotated by a motor and a magnetic circuit which automatically feeds the
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