EXPOSURE 73 
meeple walkine four miles per hour) )4/20 2.2). LA LOO 3: 
Mebicles/at eight miles per howe yyy. nee Ufa tis) Ovi 
Preineles at tenjnatles per Hour) ie) P2005, 
Remicles atitwelve miles per hour sinensis). L250) 05 
Bicycle and horse races ....... Se De eR CUAL 1/500) .5, 
LE Gioky lini lrken Ns A OE NE HI OA L/600));; 
matomopile and fast horse races. 3652990 ove P/TOOO 
If the object is at 50 feet distance, twice the exposure can be 
given; at 100 feet, four times as much. The longer the focus 
of the lens the shorter must be the exposure, and the more 
nearly the object moves at right angles to the axis of the lens, 
the shorter the exposure. 
EXPOSURES FOR INTERIORS.—Cover the camera and head 
with the focussing cloth, and wait until the eyes are accus- 
tomed to the dull light. Stop down until detail can barely be 
seen in the deepest shadow in which full detail is required. 
Note the stop, and consult the following table for the ex- 
posure at f: 16 of a plate or film classed as 1% A. P.: 
Stop noted Exposure at f: 16 
ace 56 minutes 
ifavalk 28 minutes 
ale 14 minutes 
eee 7 minutes 
eo 314 minutes 
~f:45 134 minutes 
f : 64 52 seconds 
For other stops or plates, calculate from the known speeds, 
remembering that each step in plate speed represents 50 per 
cent, whereas each listed stop represents 100 per cent varia- 
tion. 
NicHtT PHoTocraPpHY.—Exposure suggested for trial at 
f:8 with ortho plates of speed 1% A. P.: 
ited Sao wi Widows) \\.).)3)2\5 4/5 Wisi) ee ants 1 minute 
