The Total Solar Eclipse of 1900. 75 
Description of Figures. 
The kinematograph arrangement used is shown in detail in figs. 3, 4, and 5. 
In the end view (fig. 8) is seen the handle /, two turns of which are required 
for each exposure, actuating a crank and connecting-rod which drives the lever / / 
up and down. The fulcrum of this lever being some four feet from the portion 
shown in the figures, the motion is almost purely vertical. 
This lever actuates the piston ¢ ¢ (see figs. 3, 4, 5), which carries across it a 
light steel bar, 4, 6, 6, 6, shown dotted in end view, and is connected by cords 
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to the pulleys p p, pp’, which carry pawls, engaging in six-toothed rachets on the 
drums carrying the photographic plates. — 
A second pair of cords, connected by a spring ss, serves to keep the teeth 
of the ratchets pressed against the pawls. 
As the bar 6% is carried up and down, the effect is to advance the drums 
one-sixth of a turn alternately. The left drum advances one-sixth as the bar 
is raised (the right remaining stationary), while the right advances one-sixth 
while the bar is lowered. 
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