. The Bell System technical journal . or photographing a clock is shown in Fig. 4. Itconsists of a lens and shutter, shown at the top, and a periscope con-sisting of two right-angled glass prisms mounted in the vertical periscope places the image in the center of the film and since thereare two reflections the image will be the same as if none were shutter is equipped with an automatic release which is operated adefinite time interval after the beginning of an oscillogram, the time25 378 BELL SYSTEM TECHNICAL JOURNAL being determined by means of a slow acting relay or by a se
. The Bell System technical journal . or photographing a clock is shown in Fig. 4. Itconsists of a lens and shutter, shown at the top, and a periscope con-sisting of two right-angled glass prisms mounted in the vertical periscope places the image in the center of the film and since thereare two reflections the image will be the same as if none were shutter is equipped with an automatic release which is operated adefinite time interval after the beginning of an oscillogram, the time25 378 BELL SYSTEM TECHNICAL JOURNAL being determined by means of a slow acting relay or by a sequenceswitch. It is desirable to stop the film from rotating before photo-graphing the clock which may be done by means of the same relaythat turns off the lamp, or by means of a sequence switch. Main Features of Continuous-Film Oscillograph A picture of the continuous-film oscillograph is shown in Fig. differs from the polar oscillograph mainly in the form in whichrecords are obtained. As previously stated, records are made in. Fig. 10—Continuous-film oscillograph with covers removed. rectangular coordinates on a strip of film and may, therefore, be of anylength depending only on the length of film available and on the size ofthe storage magazines. The oscillograph shown makes records onmotion picture film or sensitized paper of the same width. The film is
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
