The Techniques of the Hand Camera

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Sands & Company, 1901 - Cameras - 90 pages
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Page 20 - Over his relics was raised a thupa one league in height, each brick of which was worth one crore. It is said* that there was a great difference of opinion as to what should be the size of the thupa and of what material it should be constructed ; when these points were finally settled and the work of building had started, the citizens found they had not enough money to complete it. Then an...
Page 88 - One or two drops of a 10 % solution of bromide of potassium may generally be added, but no hard and fast rule can be laid down in this respect, as the necessity for bromide seems to depend to some extent on the make of the plate.
Page 28 - The time of exposure is proportional to the square of the focal length of the lens.
Page 12 - In other words, depth of focus is directly proportional to the diameter of the circle of confusion, and inversely proportional to the diameter of the aperture. From eq. (2) we know that C' = rr7- • • • (2) and by similar triangles d 6 D _ d Substituting the value of c
Page 28 - D' : so that the shorter the focal length, the greater will be the depth of field ; all other conditions (viz. 6", , and 0) remaining the same. With a focussing camera, the values of a and D' should be calculated for the lens in nse, and tabulated in some convenient manner.

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