Movie Age (1927)

AUGUST 20, 1927. PAGE 19 Re-Designed Powers H. I. Lamps Have Important Changes In Construction The Power’s High Intensity Lamp, or¬ iginally known as the G. E. Lamp and manufactured by the General Electric company at its Schenectady plant, was later called the Power’s High Intensity and manufactured in improved form by the Power’s Division of the International Projector Corporation. It has now un¬ dergone extensive redesigning and a number of important improvements have been made. The first lamps put out by Power’s were installed in lamphouses originally designed for the ordinary arc and this created many annoying difficulties and limitations, but as now designed Power’s High Intensity Lamp may be operated up to a maximum capacity with an ab¬ solute assurance of satisfaction. The new lamphouse has been de¬ signed with ample allowance for the heavy duty lamp is called upon to per¬ form and proper ventilation has receiv¬ ed full consideration. The lamphouse is 26 inches long by 26 inches high by 15 inches wide over-all and the design of the upper section will be found to greatly facilitate rapid removal of gases and vapors from the burning arc. The condenser mount is designed so that the condensers may be adjusted vertically and laterally so that accur¬ ate alignment may be obtained with the centre of the condensing lenses placed absolutely on the optical axis. .In former lamps the asbestos guide, acted as a guide for the positive carbon, but owing to the many connections throughout which the carbon passes be¬ fore coming in contact with the positive contact shoes, it was found practically impossible at all times to get an accurate alignment of the positive carbon on the optical axis without leaving undue clear¬ ances. This often caused the carbon to travel eccentric. This feature has been discontinued and the guide for the posi¬ tive carbon in the front assembly of the lamp is now formed in the front of the revolving carriage. One of the most important features of the new construction is a new posi¬ tive feed assembly. This new assembly is adjustable so that the rate of feed may be varied for different diameter car¬ bons such as the 11 mm. or 13.6 mm. depending on the amperage used. The rtegative assembly has been con¬ siderably re-enforced and a new carbon clamp of very rugged construction add¬ ed, which eliminates the danger of bending this important part while tight¬ ening the negative carbon securely in the holder. In the new lamp the backward and forward adjusting screw has been moved to the left almost 3 inches thereby leav¬ ing plenty of room for manipulation by the projectionist. The adjusting screw of many threads per inch has been eliminated and an ad¬ justing screw having but five threads per inch has taken its place. Texas Organist Perfects A “Pipeless” Pipe Organ Perfection of a “pipeless organ” is re¬ ported to have been made by R. K. Daniel, organist, of Austin, Tex. It is claimed that the Daniel model will pro¬ duce all of the required tones .without the present range of 66 pipes to each stop. The “pipeless organ” is said to be based on the principle of a “magnifier” which conveys tones from each of the 66 pipes from each stop, thus doing away with the pipes of the ordinary organ. The mechanism provides that air from the chest shall be in constant motion through the pipes simultaneously, being released and “magnified” to make a full tone upon playing the proper key. White pine wood of triple thickness is the material from which the “tone box” is made. This part of the mechanism, if the invention proves successful, will replace the six ranks of 66 pipes and per¬ mit the installation of 50 ranks within the box. Initial experiments with the “pipeless organ” were interesting. One of these demonstrated that the trumpet stop, the loudest on the organ, under the new ar¬ rangement could not be heard within a distance of three feet while repressed in the tone box, although it poured forth the required volume when the “magni¬ fier” was brought into play. New Changeover Device Is Introduced1 To Meet Demand of Conditions In 1921, L. D. Strong, a Chicago pro¬ jectionist, worked out and placed on the market the first electrically controlled method of changeover from one project¬ or to another. The Essanay Electric Manufacturing company was formed to make the product. Mr. Strong recently has perfected his DeLuxe Model device, which in every way meets the more ad¬ vanced demands of the industry. A technical description follows: It has a 5-inch opening, large enough to pass all light rays from the moving picture projectors, stereopticons and ef¬ fect px-ojectors, when the changeover unit is mounted over the port. The 5inch apei'ture makes the DeLuxe suit¬ able and efficient for use on all stere¬ opticons, effect machines and moving picture projectors when mounted in po¬ sition at the port openings, entirely re¬ moving the changeover units from the machines. The 3-inch iris type shutters are op¬ erated by two heavy duty solenoids. The electricity is automatically cut off from the operating coil immediately after opei’ation, so that it is impossible to burn out the coils. The operating switch may be pushed in and left there indefinitely without possibility of damage to the de¬ vice or effect on the performance of it. It locks in both open and closed position and is absolutely fool proof. This mod¬ el has been further improved by the ad¬ dition of a terminal block and new type coils. An improved type switch has also been perfected which will operate either mod¬ el changeover and may be used either as a well of foot switch. Heavy phos¬ phor bronze contacts are provided and the whole is enclosed in a heavy cast iron housing. An extra heavy plunger spring allows the operator to rest his foot on the plunger head while waiting for the changeover, without the possi¬ bility of making a premature contact. The switch box requires no machine drilling — it comes ready to lag to the floor in any position desired. Watch this page every week It will give you the important new develop¬ ments in the equipment field and help you select the right equipment for your theatre.