NATURE 



[May 4, 1905 



INSULATION TESTER 



Reading to 20 

 IWegohms with 

 Aperiodic Read- 

 ings independent 

 of Speed of 

 Inductor. 



THE 



Kiill H..rli.ii-,„sofal,ovean 1 • ihrr iuini, ,,1 ELECTRICAL IVIEASURING 



INSTRUMENTS for I, ..Ijo. atones -v, , are , nnrained in our NCW 



Illustrated List, po-.t free on applKauon. 



ISENTHAL & CO-.^iTMortimer St., London, W. 



(■,■;;/<■,!, /,>.s /,, //„• A.lmh-alty. II 'nr, /,i,/i,r c^ Cohnia/ O/fics, i;-, , 



WOODHOUSE 

 INCLINED PLANE. 



Price 2S/- 



TOWNSON & MERCER, 



34 CAMOMILE STREET, E.G. 



C. E. MULLER, ORME & CO.'S 



NEW RESISTANCE GLASS 



excels Jena Glass in its power to stand sudden variations of temperature. 



N.B.— The ' Ificial test at the Charlottenlnirq Institute showed ili.it «ith this i;la!;s the alkali dissolved by lOO c.c. of distilled 

 waler is j.V.'tt milligrammes as compired wiih t\lr, milligrammes di'ssolved from Jena glass under the same conditions. 

 IT IS AS CHEAP AS THE COMMON BOHEMIAN GLASS. 

 May be had in BEAKEKS (various forms), FLASKS (all shapes), TU^IN^G (any size). 



C. E. MIJLLER, ORME '' '&'' CO., Lta. (S^.'^lgSIfS^El?), 



148 HIGH HOLBORN, LONDON, W.G. 



THE LONDON STEREOSCOPIC COOlPflNY'S 



LATEST INTRODUCTION 



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