

A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

 Of Nature trusts the mind which btiilds for aye."- 



-Wordsworth. 



LANTERN SLIDES 



IN NATURAL COLOURS. 



A few Subjects can now be supplied as 

 Lantern Slides for sho\A'ing in an ordinary 

 single Lantern, illustrating Photography 

 in Colours. They are composed of three 

 superposed films, the negatives of which 

 have been taken through Red, Green and 

 Blue Glasses. The colours and tints are 

 exciuisite, and show most brilliantly on 

 the screen, making very effective pictures. 

 Price 20s. each. 



No apparatus is needed to show them except an 

 ordinary Optical Lantern. 



NEWTON &^CO., 



Scientific Instrument IVlakers to H.IVI. the Queen 



and the Government, 



3 FLEET STREET, LONDON, E.C. 



A NEW DEPARTURE in CHEMICAL BALANCES. 



BALANCE on Polished 

 Mahogany Base, Three 

 Levelling Screws, &c., 

 Plummet for levelling. 

 Adjusting Screws for 

 counterpoising Beam. 

 Steel Knife Edges. 

 Will carrj' loo grms. in 

 each pan and turn with 

 1-2 m.g. 24/- 



JOHN J. GRIFFIN & SONS, Ld. 



20-26 SARDINIA STREET, LONDON, W.C 



THE NO. I "VICTORIA" HAND CAMERA. 



The lens is an 

 achromatic ot 

 best quality with 

 Iris Diaphragm. 



nged for t 



be regu 



JAMES WOOLLEY, SONS & CO., 



VICTORIA BRIDGE. MANCHESTER. 



Complete Catalogue on application. 



NEGRETTI & ZAMBRA'S 



IMPROVED 



SELF-RECOROINO 



RAIN GAUGE. 



DESCRIPTIVE 



PRICE LIST 



POST FREE. 



INVENTEh AMI MADE ONLY BY 



NEGRETTI & ZAMBRA, 



Scientific Instrument Makers to Her Majesty the Queen, 

 38 HOLBORN VIADUCT, E.C. 



Branches— 45 Cok.niull, E.G., and 122 Regent Street, W. 



