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1954-55 Theatre Catalog, 12th Edition, Page 296 (260)

1954-55 Theatre Catalog, 12th Edition
1954-55 Theatre Catalog
1954-55 Theatre Catalog, 12th Edition, Page 296
Page 296

1954-55 Theatre Catalog, 12th Edition, Page 296

burner to a slightly different position to attain that result.

We recommend that this adjustment principle be thoroughly understood before attempting to install the burner in the lamphouse, since it is the preciseness of this alignment that will determine the quantity and quality of light on the screen.

Alignment Procedure

One of our optical alignment appliances should be purchased at the time new lamps are bought, because its use provides means for accurately aligning the optical axis, and also, to precisely set both the working distance between the Peerless Hy-Speed F-2.0 condenSer system and the projector aperture or film plane, and the focal distance between the face of the positive carbon crater and the plane surface of the rear F'.2.0 condenser lens.

If so ordered, the Peerless HyCandescent is obtainable equipped with a condenser mount and dowser arm to accommodate the Bausch & Lomb condenser lens system.

When using Bausch & Lomb parabolicaspheric cinephor condensers, note that the rear surface of the rear lens is cylindrical. Its correct operating position is when the markers on the outer edge of the lens coincide with the markers on the face of the condenser mount casting. Due to its cylindrical rear face it is important that the lens retainer ring be unscrewed enough to allow the rear lens to be turned one-half of a revolution in the mount, and still have expansion space at all positions of the half turn.

When this system is used the optical alignment appliance may be used to align the optical axis, but the crater to rear condenser as well as the front lens to film line distances, must be determined through the use of a suitable measuring rule.

Amperage Range of Carbons

The Peerless Hy-Candescent lamp has a current range from 125 to 180 amperes. It has been designed to use the following carbons:

Standard Regular Trim

125 to 150 amperes, 68 to 78 volts.

13.6mm by 22 inch high intensity posi tive.

7/16-inch by 9 inch coated cored nega tive ('/2 by 9 inch negative from 140 to 150 amperes). New ISO-A Super Trim

170-180 amperes, 74-volts.

13.6mm by 22 inch positive.

'/2 by 9 inch heavy duty coated cored


At infrequent intervals during normal operations, a relatively sudden increase of current may be noted as registered by the ammeter. Generally the cause can be traced to the development of small cracks in the shell of the positive carbon.

These cracks can plainly be seen in the projected image of the burning carbon on the imager screen at a point dicetly back of the end of the crater trim.

When such cracks occur they permit a leakage of gas from the crater, rarefying the gas, which condition in turn, reduces the normal resistance across the arc. During such periods the crater will become rather shallow and the rim of it burns to a pronounced rounded edge. The only remedy, under the circumstances, is to allow the cracked area of the carbon to burn away, or retrim at the first opportunity.

Arc Image Projector Adiustment

Mounted on the outside of the right lamphouse door is the arc imager lens holder. The image of the burning arc is picked up by a mirror and redected through lenses mounted inside of the holder that focus it on the ground glass screen.

The lens holder is adjustable and the image of the arc may be moved in all directions to be properly located in on the screen. By loosening screws which hold it to the lamphouse door, and moving the entire lens holder straight forward or backward on the glass frame, the projected image can be moved to the right or left of the screen,

The screen holder with screen, may be tilted if desired, so that the projected image of the arc does not have to be

viewed at a distorted angle as would be the case if the projection angle was exceedingly steep.

Lubrication Recommendations

Graphite or a lubricant containing graphite should not be used on any part of the burner mechanism.

Due to the generous size of the lamphouse, provisions for exhausting the heated air and gases through use of eight inch chimney and piping system and the further cooling effect of the forced draft of the blower, the temperature of the burner parts do not reach the point of carbonization of high-grade automobile engine oil; hence, we recommend its use as a proper lubricant. About No. 20 S.A.E. viscosity will be found best.

Only one drop of oil per week should be applied to all oil cups, including the motor. Wipe off excess oil immediately should it over-flow the oil cups when injecting oil into them.

One drop of oil should be applied on the inside faces of the front and rear outer clutch races and the center flange on the inner race.

Oil may best be applied to the surface of the negative and positive carriage guide rods, as well as the teeth of the negative feed rack and pinion, by placing oil on the ball of the middle finger and rubbing it over their entire surfaces therewith and then wipe dry with a cloth.

All rotating parts operate at exceedingly low speeds,emany make less than one revolution per hour, so do not oil and avoid the troublesome consequences of so doing,

All parts of the burner mechanism are convenient to reach, and they should be wiped clean before the start of each

dayis run.


The Peerless Magnarc high intensity lamp is designed to operate from 1-K.W. (40 amperes 27 volts) to 75 amperes 45 volts. As a consequence this lamp may be operated with any multiple arc type motor generator, or a 110 volt direct current service, or with a rectifier, providing the current capacity of the rectih-ers or motor generator is sufficient for the current rating of the carbons to be used in each lamp.

Low voltage motor generators and rectifiers having satisfactory outputs are available for use with this are. These lamps may also be operated from higher voltage generators if proper ballast rheostats are inserted in the circuit to reduce the generator output voltage to that required at the arc.

After installation, however, if it is found desirable to change the original carbon sizes to use more or less current, this may be accomplished with very little effort in the projection booth by simply changing two gears.

Lamphouse Ventilation

The Magnarc operates at relatively low arc voltage and precautions should be taken to guard against air drafts which will disturb the are. If forced

AN INTERIOR View of the Peerless Hy-Candescent. All parts of burner mechanism easy to reach.


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1954-55 Theatre Catalog, 12th Edition, Page 296