b':2-S0 o 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



"To the solid ground 

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



No. 1521, Vol. 59] 



THURSDAY, DECEMBER 22, li 



[Price Sixpence. 



Registered as a Newspaper at the General Post Office.] 



THE "NEWTONIAN" 



UNIVERSAL SCIENCE LANTERN 



NALDER BROS. & CO., Ltd. 



LONDON. 



N. C. S. 

 THOIMSOaM 



REFLECTING 

 GALVANOMETER. 



5000 OHMS RESISTANCE. 

 VERY SENSITIVE. 



Complete for Slides, Microscopic Objects, and Spectra. 



Price £18. 



For Lecturers on Light, Colour, and Colour Photography, &c. 



Sole Makers: NEWTON & CO., 3 FLEET STREET, LONDON. 



SHORT^EAM BALANCEST 



CHEAP, QUICK-ACTING, 

 ACCURATE, 



KNIFE EDGES AHD PLANES OF ACATE 



Compensating Stirrup 



Suspenders. 



To carry 200, 500 grammes. 



Price £7. £9 9s. 



PRICE 



.^i& 10 



■Write for CATALOGUES. 



Cable Address : 



SECOHM, LONDON. 



No Agruls in T.I^.A. 



This Instrument delivered Free anywhere in U.S.A. 

 for «60 C.O.D. 



CIXXC.IS'nVE.A.S I»ItESEBrTS. 



ASSAY BALANCES. 



Aluminium Beams 



5 Grammes in each Pan 



Indicate i'„ m.g, 



£10 10s. and £7. 



CHEMICAL BALANCE. 



Aluminium Beam. 



New design Sliding Rider. 



To carry 100 ssogrms. 



Indicates ,V ,'r, m.g. 



£8 15s. £10 10s. 



WRITE for BALANCE CATALOGUE 



JOHN J. GRIFFIN & SONS, \2 



20-26 SARDINIA STREET, LONDON, W.C. 



NEGRETTI & ZAMBRA S 



TRAVELLERS SCIENTIFIC COMPANION. 



Aneroid Barometer with Altitude Scale. Compass with Patent Dial and- 



Thermometer for Air Temperatures (or a Clinical Thermometer may be 



substituted). An excellent Present for Oflicers on Foreign Service. 



PRICE £4 lOs. to £7 10s. 



Can also be h.ad Mounleil in either Gold or Silver Cases. 



"Special" Illustiated Price List of Instruments, suitable for 

 Presents, free by Post to all parts of the World. 



SCIENTIHC InSTRI'.MENT MAKERS TO THE QUEEN, 



38 HOLBORN VIADUCT, E.G. 



Ukanches— 45 CORNHILL, .and 122 REGENT STREET, London. 



