. The American annual of photography. ; that is, the exposurewill be 6* times as much as the exposure required with an aperture whose diameterequals p + 4, assuming the aperture (a) to be \ inch diameter. AND PHOTOGRAPHIC TIMES ALMANAC. 305 FOCUSING SCALES FOE ANY LENS OF FROM 3 TO 12 INCHES EQUIVALENT FOCUS. Drawn by W. T. 306 THE AMERICAN ANNUAL OF PHOTOGRAPHY, TABLE SHOWING DISPLACEMENT ON GROUND GLASS OF OBJECTS IN MOTION. By HENRY L. TOLMAN. [Republished, with corrections, from the Photographic Times.] Lens 6 in Equiv. Focus, Ground Glass at Principal Focus of Lens. Distance
. The American annual of photography. ; that is, the exposurewill be 6* times as much as the exposure required with an aperture whose diameterequals p + 4, assuming the aperture (a) to be \ inch diameter. AND PHOTOGRAPHIC TIMES ALMANAC. 305 FOCUSING SCALES FOE ANY LENS OF FROM 3 TO 12 INCHES EQUIVALENT FOCUS. Drawn by W. T. 306 THE AMERICAN ANNUAL OF PHOTOGRAPHY, TABLE SHOWING DISPLACEMENT ON GROUND GLASS OF OBJECTS IN MOTION. By HENRY L. TOLMAN. [Republished, with corrections, from the Photographic Times.] Lens 6 in Equiv. Focus, Ground Glass at Principal Focus of Lens. Distance on Miles perHour. Feet perSecond. Ground Glass, Same with Same with in inches,with Object 30 Object 60 Feetaway. Object 120Feet away. Feet away. 1 IK .29 .15 .073 2 3 .59 .29 .147 3 4K .88 .44 .220 4 6 .59 .293 5 1% .73 .367 6 9 .88 .440 7 iox 1 03 .513 8 12 2 35 .587 9 13 .660 10 UH .733 11 16 .807 12 1% .880 13 19 .953 14 20K 15 22 20 29 25 37 30 44 35 51 40 59 2 933 45 66 50 73 55 80 60 88 75 110 100 147 125 183 150 220
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1892
