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A WEEKLY ILLUSTRATED JOURNAL OF :SCIENCE. 
*To the solid ground 
Of Nature trusts the mind which builds for aye.-—Worpsworth. 
~ No. 2451, VOL. 98] 
Registered as a Newspaper at the General Post Office.] 
THURSDAY, OCTOBER 10, 1916 
[PRICE SIXPENCE. 
[All Rights Reserved. 
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(W.&J.GEORGE.LTD.,SUCC#=) LONDON, E .C. 
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With plain slit, 26/6; with adjustable slit, 33/- 
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OPTICAL & PILOTOGRAPHIC APPARATUS. 
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A New Barograph—THE ‘* JORDAN.” 
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Shows at a glance the movements of the barometer during 
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