After “curing” for the proper number of hours, this substance becomes buna rubber. or the Minnesota Mining and Manufacturing Co. The sealing compound used is a commercial oil-resistant sealer made either by the Armstrong Cork Co. These were desilvered, filled with Esso's heaviest mineral oil, known to the trade as Primol D, and sealed over with a circular glass surface plate having a 1-inch hole adjacent to its margin. 3) consists of two “liquid” lenses constructed with two 19-inch searchlight mirrors made for the government by Bausch and Lomb. Moreover, no ordinary projection lens is ever so highly corrected for color, flatness of field, or for spherical aberration. An ordinary projection lens would have to be of very long focal length to cover such an area and of tremendous size to permit comparable illumination. At a distance of 25 inches it easily covers a 20-inch circle. This is a very sharp lens, said to represent one of the optical engineering achievements of the war. The projection lens is a 24-inch F 6.2 aerial ectar camera lens used by the government for photography during the recent war. Images of such proportions, however, are necessary only for unusually large groups. As far as can be ascertained, this is not possible with other available film projectors capable of projecting full-size 14 × 17-inch roentgenograms (1 – 3).Īt 30 feet distance the image can be “blown up” to 20 feet square without loss of appreciable sharpness or detail. This permits its use in the small pit of a hospital or medical school amphitheater.
#New projector pro
It projects a 6 × 6 foot image at a distance of 10 feet from the screen (Fig. Epsons new 4K 120Hz projector might be perfect for PS5 and Xbox Series X By Rhys Wood published FebruThe Epson Pro Cinema 4K PRO-UHD LS12000 laser projector boasts specs that could. The instrument has been developed from war-surplus material. It fulfills most of the long sought features a lecturer, demonstrator, teacher, or audience would desire. The entire range now uses lasers as its light source, including the new. The purpose of this paper is to present a new projector, constructed along the simplest lines, which makes possible efficient enlargement and projection of conventional roentgenograms of all sizes (Fig. Sony has updated its 4K home theater projector lineup for 2022, and in so doing has said goodbye to high-pressure bulbs. Conversion of roentgenograms into lantern slides is costly, time-consuming, and disappointing because of loss of detail. Passing the films around is less satisfactory. Demonstration of fine detail, under these conditions, even to those in the first row of seats, is hardly possible. Presenting roentgenograms to large groups with conventional illuminators is a frustrating experience. UPDATED JULY 2022 - 5,000 and up brings you todays best Home Theater projectors. One of the least satisfactory phases of present day roentgenologic hospital practice is the lack of adequate facilities for projecting full-sized original roentgenograms for demonstration purposes at conferences, lectures, staff meetings, and in student classes.
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