284 Lord Rayleigh. On the Tension of [Mar. 6, 



Figs. 1 and 2. 



aperture, and the ten seconds needed to produce a suitable impression 

 upon the gelatine plate was not so long as to entail any important 

 change in the condition of the jet. Otherwise, it would have been 

 easy to reduce the exposure by the introduction of a condenser. In 



