420 Miscellaneous Intelligence. 
into rotation, the jet and screen were illuminated b a rapid succes- 
sion of flashes of light.* Instantly the troubled section of the jet 
a to be resolved 
When the flashes followed each other as fast as the apm the 
: 
well known optical relation. It may be added, that by changing 
the relative distances of the jet and screen from the illuminating 
ocus, we may make the shadows of the drops so large as to 
seen without difficulty from the remotest parts of the largest 
formed on the screen, and suitably interrupted at short interv 
: by the sound of a monochord, tuned to tension with it, 
Exp. 2.—The jet was chastened into greater regularity of php id 
or 
cr . pon yenae ae A > ° . f the screen seems 
Pinca the dise is spinning _ rapidly, the illumination o et in the light, 
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