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Aviation History
1932
1932 - 0128.PDF
FLIGHT, FEBRUARY 5, 1932 " "#T FOLMER AERIAL CAMERA >gr NEAT type of aerial camera (~ \| intended for close-up ^S "I ground shots as well as vertical and oblique shots from the air is the K-10 developed by the Folmer Grafiex Corp., of Roches ter, N.Y. An aluminium body, streamlined to lessen resistance, brings its weight down to 22 lb. when loaded with 25 exposure roll film. A half-turn of the winding crank and slight pressure on the re lease iever takes the picture, the lever being close enough to the right-hand grip to enable the operator to press it without releasing his hold. The shutter is automatically set and the film moved into position for the next exposure by a single half-turn of the crank. The Folmer K-5 readv for oblique photo graphy. The shutter operates from 1 / 50th of a second to 1/220th of a second, and is the focal plane type, which has a high-speed curtain operating in close proximity to the film for high shutter efficiency. The Kodak anastigmat lens, 10-in. f.4.5, is fitted, with an adjustable Iris diaphragm housed in a specially designed focusing mount to permit the camera being used for both aerial and ground work. Distances of 8 ft., 10 ft., 12 ft., 25 ft., 50 ft. and 100 ft. and infinity are graduated on the front of the mount to assist in accurate focusing. A snap button holds the lens rigidly at infinity. The finder is of the direct vision box type, which can be moved out of the way when the camera is not in use. A snap button release brings it into position, and it is held rigidly against wind pressure. A spirit level of the T type is mounted on the back as a guide for levelling the camera. The capacity of the K-10 is 25 expo sures (5 in. x 7 in.) per roll of film. Three types of film are available, regular, supersensitive and hypersensi- tised, and the loading or unloading may be done in daylight as simply as with an ordinary hand camera. The rear section of the K-10 is removed easily for this purpose, while the roll film is held in place by two knurled spool centres which are unscrewed on the outside of the camera. The number of exposures is auto matically recorded for the operator, and a field case, cushioned to absorb shocks and carry four 25-exposure rolls of film, is provided for housing the K-10. This camera is intended for the use of all flying men who are interested in aerial photography, whether professionally or as amateurs. A larger type of aerial camera de veloped by the same company is the K-5. It is operated from suspension mounts, one fitted over an aperture in the fuselage floor for vertical shots, and another attached to either side of the fuselage for oblique shots. The inner frame of the vertical suspension mount has a universal movement, which, together with two spirit levels fitted on the camera, enables the operator to keep the camera accurately aimed at the moment of exposure. The utility of the K-5 is increased by its adaptability to 12-in. and 20-in. lens. For oblique shots the cone fitted with the 20-in. lens is best, as it gives a larger image and permits photo graphs being made at higher altitudes. Kodak anastigmat f.4.5 lens is used, and the focal plane shutter has a single aperture of If in., with speed adjustable from l/60th to 1/280th of a second. A perforated platen on the camera is connected by rubber hose to a Ven- turi tube fixed to the outside of the fuselage, to create a constant vacuum suction through the platen to hold the film flat in the focal plane. The tube must be placed to prevent sharp bends in the connecting hose. The K-5 has a capacity of 100 ex posures, the size of the negatives being 7T6 in. x 9J in. Constructed of aluminium, its weight with a 12-in. cone and 75 ft. of film is 37 lb., or 47 lb. with the same amount of film and the 20-in. cone. FORDS IN THE ALBERT HALL "THE FORD MOTOR COMPANY, of Regent Street, London, W.l, have taken the Albert Hall, Kensington, from February 19-22, for the public exhibition of all Ford products. These will include such parts of Ford aircraft as it is possible to get into the Hall, Ford and Lincoln cars, agricultural and commercial vehicles, while the centre of attraction is expected to be the new 8-h.p. baby car which it is antici pated will be produced in large num bers from the Dagenham plant, by- May. THE "SELFRIDGE" FLYING HELMET "THE CHIEF features of this helmet are that it is made in four panels, which run from front to back, thereby ensuring a much closer fit across the head ; the front and sides are de signed to fit closely across the fore head and round the ears ; the strap has been so placed that, instead of pulling the helmet apart in front of the telephones, it causes it to sit even more snugly across the cheeks ; the strap is wide and does not go too far back across the throat, and is fastened The Selfridge flying helmet. by a large and easily adjustable slid ing buckle, thus preventing the usual wear that occurs with the normal type of prong buckle which necessitates eyelet holes in the other half of the strap. The fittings for the telephones are of the normal type, except that the inside is of " Sorbo " padding, to prevent the metal parts of the tele phones hurting the ears. In the event of the ear-phones not being worn, an extra leather flap is provided inside to remove any likelihood of draught. There are either one or two buckles, whichever are required, on the back of the helmet for holding the goggles to the helmet. Inside the helmet, along the line of the forehead, is a velvet pad to prevent the helmet from marking the forehead or slipping. This helmet can be supplied in either black or brown leather, and special sun-proof lining can be fitted, if required, at no extra cost. In quiries should be sent to the Aviation Department of Selfridge & Co., Ltd. ROTAX EQUIPMENT . THE RAPID increase of night flying has led to the production of many types of suitable lighting installations for aircraft. Amongst the leading firms producing such equipment are Rotax, Ltd., of Willesden Junction, N.W.10. Their installation for normal night fly ing may be fed either by a wind-driven or engine-driven dynamo, both of A Rotax wing-tip light.
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