<-> W O . «-; 



1^1) 6^9- 



A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



IVEZ'WTOIV SS. 00., 



SCIENTIFIC INSTRUMENT 



MAKERS 



TO HER MAJESTY THE 



QUEEN 



AND THE GOVERNMENT. 



Ph 



ICAL Ins 

 Makers bySp 



Al-POINTMENT TO ' 



Makers of every descrip- 

 tion of OPTICAL and 

 PHYSICAL APPARA- 

 TUS of the highest class, 

 for Colleges, Institutions, 

 &c. 



Catalogue of 

 OPTICAL LANTERNS, 

 PROJECTION APP.^RA- 

 TUS, and SLIDES, f>d. 

 WIMSHURST ELECTRICAL MACHINES. 



Best ( luality, 12 in., 70s. ; 15 in., £'; loi. ; 18 in.. Id loi. Multiple-Plate 

 M'achines, .£20 to ^150. As made for the Science and Art Depart- 

 ment, and the Universities of Oxford, Cambridge, London, Sydney, 

 N.S.W., McGill, Montreal, &c. 



3 FLEET STREET, TEMPLE BAR, LONDON, E.C. 



xso 



NEW 



MICROSCOPE 



THE 



"BRITISH STUDENTS." 



Microscope Stand No. 55, as 

 figured, with Iris Diaphragm, 

 One Eye-piece ; Double Nose- 

 piece, Two Object-glasses, 2/S" 

 and 1/6", adjusted to be in 

 about focus, and the Tvhole 

 packed in polished Mahogany 

 Case, 



£6:8:6 



R. &. a. BECK, Ltd., 



68 CORNHILL, LONDON, E.C. 



BROWNING'S 

 "PANERGETIC" BINOCULAR 



OPERA, FIELD AND MARINE GLASS. 



Has 12 Lenses, gives a very large field of view, arid 



exhibits objects with remarkable brightness 



and clearness. 



The " Panergetic " is 

 the best Binocular, for 

 general use, made ; only 

 its price has prevented it 

 from being more widely 

 known and used. Now it 

 is reduced nearly half inr 

 price. The medium size 

 in Black Enamel being 

 £2 5s., and in Alum- 

 inium ^3, in best Cases 

 complete. 



FULL PARTICULARS BY POST. 



JOHH BBOWHIHC, 63 STRAND, LOHDOH,W .C. 



N E G RETTI & ZAM B R AS 



IMPROVED 



SELF-RECORDING 



RAIN GAUGE. 



DESCRIPTIVE 



PRICE LIST 



POST FREE. 



INVENTED .-VN'l) .\I.M5E ONLY BY 



NEGRETTI & ZAMBRA, 



Scientific Instrument Makers to Her Majesty the Queen, 

 38 HOLBORN VIADUCT, E.C. 



Branches— 45 CORNHiLi., E.C. , and 122 Regent Street, W. 



