A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 



Of Nature trusts the mind which builds for aye." — Wordsworth. 



No. 2772, Vol. no] SATURDAY, DECEMBER 16, 1922 fPRicE One Shilling" 



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Newton's Episcope 



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See Physical Catalogue {Oct. 1921V. Post free on application. 



Wireless Apparatus and Accessories supplied. 



Also New Catalogues of Chemical Apparatus, Chemicals and Reagents. 



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