Boxoffice (Jul-Sep 1947)

ward the gas ball at the end of the carbon. Only by this means can the magnetic stabilizing effect be exactly proportioned to the current flowing in the arc. “The advantages of unit construction in general are so well known as to require little elaboration. In the Ashcraft C-70 lamp, however, this principle has been carried through to its ultimate conclusion. The entire mechanism (motor, gears, shafts, rheostats, etc.) are contained in one compact, neatly covered, removable element, positioned on the outside of the lamphouse (Figs. 2 and 4). The covers are easily removed for inspection and care of the element. “There is practically nothing within the lamp housing proper except the carbons and their holders, a drip cup and a small steel stabilizing loop. Mechanisms in close proximity to the intense heat and inevitable ash of a carbon arc not infrequently deteriorate rapidly and occasion erratic arc behavior, thus nullifying the effect of even the most precise controis. “The C-70 type of unit construction is also a boon to speedy servicing should the occasion arise. The element need only be detached from the lamphouse frame, a few minutes work and as quickly replaced by another. Thus, a supply dealer or a group of theatres in a given area need have only one or at most two spare elements on hand to meet an emergency. “All manudl controls are outside the lamphouse, mounted compactly on a panel on which all controls are plainly indicated (Pig. 2). This panel also includes an ammeter. The positioning of both the mechanical elements and manual controls outside the housing is a convenience for the projectionist, aids operating efficiency and is of vital importance in preventing wear. “Still another aid to projectionists in maintaining maximum screen illumination is the ease with which carbon lineup and adjustment is made. The carbons do not tilt and do not require manual tinkering. If either vertical or horizontal adjustment of the negative carbon is required, the carbon is not tilted, but is adjusted quickly and precisely from the control panel outside the lamphouse. “The Ashcraft C-70 feed mechanism will require no oiling for many years. With ball bearings on the high-speed shaft and roller bearings on the medium-speed shaft, the C-70 utilizes a new oil-impregnated bearing on the oscillating and low-speed shaft. This latter bearing actually lubricates itself from within, being a highly compressed powdered metal which has been impregnated with sufficient lubrication for its lifetime. “The advantages of a solid cast aluminum housing, including doors, over the conventional sheet metal type are obvious in terms of lighter weight, greater resistance to denting and rusting, and general durability. Special door baffles keep the housing cool to the touch of the hand. The arc imager Reduce Your Suprex and High Intensity CARBON WASTE 25% With the Cross Carbon Saving Device Write for Booklet and Trial CROSS MACHINE SHOP 2918 Pennsylvania Ave. Detroit 14/ Mich. (Fig. 1) is visible from any viewing angle, thus enabling the projectionist to maintain constant surveillance of arc status and general operating conditions. “The C-70 lamp is designed for operation without forced ventilation or any other extraordinary precaution. Openings are provided in the lamphouse for natural draft and are so arranged as to offer not the slightest interference with arc stability. “Whiie the C-70 is almost wholly an inplant product, those units obtained from outside suppliers are of the best possible quality available from manufacturers of national repute, such as Bausch & Lomb, General Electric, New Departure, Ohmite and others. “There are nothing but the finest quality parts in the C-70 lamp, down to the last screw. The lamp is ail new in that is planning and design started from scratch, with ideas such as ‘a little bit different’ or the use of units from previous lamps being rejected at the very outset. The C-70 was designed to do a specific job, and I know it will do that job extremely well. “The C-70 will soon be on display at independent dealers throughout the U.S. and Canada, and meanwhile it will be demonstrated at various trade shows and meetings of technicai societies, including the forthcoming joint TESMA-TEDPA convention at Washington, D. C.” Stir the jaded appetite for entertainment by giving your patrons a new setting in which to enjoy it. “Get it done!,. we are gradually catching up on orders for the HERTNER There’s a 'InmsVertelk for every projection room requirement Transverter Type C.P. (90100 volt) or M. A. — for high intensity condenser (straight high intensity). Transverter Universal Type (45-48 and 90-96 volt) — for Suprex Projectors. Spot Lamps, Dissolvers and all types of projection lamps. Transverter Type H.I. (42-50 volt) for Suprex Projectors. Transverter Type H. I. H. (60-70 volt) — for Suprex Projectors and Spot Lamps with 40-50 volt arc. Transverter Type "LV” (33 volt) — for low-voltage, high-intensity projector (1 K.W. arc). V, THE PROJECTION at low operating cost • In spite of many difficulties, deliveries on Hertner Transverters are running much better than they were at the beginning of the year. We suggest that you get the facts NOW about Transverter equipment for your projection room. With Transverter equipment you are sure of: 1. Reliable Performance, 2. Constant Screen Illumination, 3. Quiet Operation, 4. Low Operating Cost, and 5. Long Life. Distributed by NATIONAL THEATRE SUPPLY In Canada; GENERAL THEATRE SUPPLY COMPANY ELECTRIC COMPANY Exclusive Manufacfurer of the Transverter A General Precision Equipment Corporation Subsidiary « ^ , 12600 ELMWOOD AVENUE • CLEVELAND 11, OHIO BOXOFnCE :: September 13, 1947 55