^OS, Yi 



lC%. 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



THE "NEWTONIAN" \ MAI OpR RROQ JL C^Ck I Tn 



UNIVERSAL SCIENCE LANTERN '^"^ ,6 rFd lion stVeFt; wnVo^e.c 



AYRTON-MATHER UNIVERSAL SHUNT BOX. 



omplete for Slides, Microscopic Objects, and Spectra. 



Price £18. 

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



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



Does not need adjusting for each Instrument, but can be used indis- 

 criminately for Galvanometers of any resistance. No plugs to get lost. 

 Multiplying powers: — i, 3, 10, 30, 100, 300, 1000. 



" > makes a convenient form of Potentiometer. 

 Price y£3 15s. 



Wri 



Catalogue. Cable Address, "Secohx 



No Agents, U.S.A. This Ii 



, London." 

 U.S.A. for S24. 



GRIFFINS THE TOURIST'S ANEROID. 



NEW DRAUGHT 



GAS FURNACES, 



•WITH 



INDESTRUCTIBLE 

 CAST-IRON BURNERS. 



Producing a WHITE HEAT 

 Crucibles or Muffles. No Gauzes ; 

 Smoke. A perfect Bunsen Flame, 

 troublesome Internal Fittings : the Cover 

 snivels oft : the Crucible is easily removed. 

 Most powerful and reliable Burner. 



elts Cast-iron in 35 Minutes from time of Ligrhting. 

 I ILLUSTRATED PRICE LIST POST FREE. 



*JOHN J. GRIFFIN & SONS, 12 



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



(WHITESIDE-COOK'S.) 



Fop Measuring Altitudes without Calculation. 



RATED Price List 



Made only by 



NEGRETTI & ZAMBRA, 



SCIENTIFIC INSTRUMENT MAKERS to THE QUEEN, 



38 HOLBORN VIADUCT, E.G. 



BRANCHES : 45 CORNHILL ; 122 REGENT STREET. 



NEGRETTI .<: ZAMl'RAS •' llluvtraled Catalogue,' 6«) Pages 



,,.-.„ f „.Travint,i. Price 5i. 6tl. 



' Xegretti, London.' 



Telephone : No. 6583. 



gs. Price 

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