| Toward
the Camera. sec. | At Right Angles
to the Camera. sec. | |
|---|---|---|
| Man walking slowly, street scenes | 1/15 | 1/45 |
| Cattle grazing | 1/15 | 1/45 |
| Boating | 1/20 | 1/60 |
| Man walking, children playing, etc. | 1/40 | 1/120 |
| Pony and trap, trotting | 1/100 | 1/300 |
| Cycling, ordinary | 1/100 | 1/300 |
| Man running a race and jumping | 1/150 | 1/450 |
| Cycle racing | 1/200 | 1/600 |
| Horses galloping | 1/200 | 1/600 |
If the object is twice the distance, the length of allowable exposure is doubled, and vice versa.
To Reduce Photographs.
Here are the details:
Reducing Scale for Copying Photographs.
Turn the drawing face down and rule a diagonal line from the left bottom to the right top corner. Then measure from the left, on the bottom line, the width required. Rule a vertical line from that point until it meets the diagonal. Rule from that point to the left, and the resulting figure will have the exact proportions of the reduction. If the depth wanted is known, and the width is required, the former should be measured on the left upright line, carried to the diagonal, and thence to the lower horizon. The accompanying diagram explains the matter simply.
Color Photography:
A Three-color Process.
A.—Screen Solutions.—