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Aviation History
1921
1921 - 0168.PDF
its lull extent draws the exposed plate into the changing bag—seen at the end of the box—when the plate may be manoeuvred into place down behind the others, a procedure quite easily accomplished, and assisted by guides inside the magazine. The next plate is, of course, in position ready for exposure. Another model—the B-i—similar in general design to the above, is also made for roll films only. In this model a handle on the film magazine changes the film and sets the shutter with one turn. It is in the model K-i camera that the most interesting features may be found, for this is a design embodying the latest developments in aero-cameras. Although it is entirely automatic in operation its mechanism is remarkably simple. This camera is particularly suitable for photographic mapping. and is constructed to take roll films, giving 100 exposures of 18 X 34 cm. The daylight loading of these films is similar to the orthodox system employed in the ordinary Kodaks, and is an important feature. The camera is suitably mounted in the floor of the aeroplane, and is operated by a wind motor, mounted outside the fuselage, through flexible shafting. The wind motor consists of a paddle-wheel mounted in the lower portion of the metal motor-box, the front end of which is open to the slip stream of the airscrew. Behind the paddle-wheel is- a shutter or damper, controlled from wdthin the fuselage, which regulates -ibe air flow past the paddle- wheel and consequently the speed of the latter. From the paddle spindle a flexible shaft transmits the power to one of two connections on the camera body—one for slow speed and one for high speed work. According to the altitude and ground speed of the aeroplane, the interval between exposures is adjusted by means of the damper control of the wind motor. The camera, •which is of metal construction, comprises a " cone " carrying the lens, above which—attached by means of a quick release joint—is the film box carrying film spools, operating gear-box, and focal-plane shutter. The arrange- ment of the film spools is much the same as that on the ordinary Kodak film camera, and is clearly shown in one of the accom- panying illustrations. The focal-plane shutter, located as close up to the film as possible, is of the one-piece type with a fixed aperture of fin. By adjusting the tension of the blind speeds from 1/90 to 1/310 of a second may be obtained. Below the focal-plane shutter is a safety curtain, which is closed whilst the shutter is being reset and automatically opens as soon as this has been accomplished. The film is shifted ready for the next exposure simultaneously with the MARCH IO, 192I setting of the shutter. A key for hand operation is also provided. A rather important feature consists of an arrangement whereby the film is held accurately in the recording plane, and is prevented from vibrating. This is achieved by means of a perforated plate, on the inner side of the top cover of the film box, which is connected up with a Venturi tube in The component parts of the Kodak K-l Automatic Aerial Camera, showing the vacuum plate in the top right-hand corner, and below it the film box and focal plane shutter. The safety curtain may be seen in the view of the film box (from below) on the left. the upper portion of the wind motor-box. The suction from the Yenturi tube holds the film in close and flat contact with the perforated plate ; a release valve being provided to prevent excessive suction. The lens fitted to the K-i is a " Hawk Eye" 12-in., or, if required, 20-in. The weight, complete with 100 exposure film rolls, is 44 lbs. PHOTOGRAPHING AS THE EYE SEES IT : On the left is shown a view from above taken on an ordinary plate (which is colour-blind), and on the right the same view taken, under identical conditions, on a Wratten Panchro- matic plate with K-l filter. In the latter case true colour values are obtained, and the slight haze which prevailed on this occasion is cut out by the filter. Finnish Pilots Barred Over Sweden LAST month the ban placed by the Swedish military authorities upon Finnish air-pilots flying over Swedish territory was re-affirmed, with the result that the Finns' participation in the flying competitions arranged in Norway was practically barred. The Aaland question is at the bottom of the refusal of Sweden, a question which looks like leaving some very sore places for treatment. \ At the Christiana meeting on Saturday last, when the air racing took place, the weather was pretty bad and exciting times were experienced. The course for the chief race was a triangular one of 85 kiloms., none of the eight starters com- pleting the specified flying peiiod. Bestmann, through a seized motor, had to give up, whilst both Lieut. Normann ,and Capt. Hellesen were injured through accidents. 168
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