A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE. 



" To the solid ground 

 Of Nature trusts the tnind which builds for aye.' 



-Wordsworth. 



NEWTON & Co.'s 



New "College " LANTERN. 



.MADi: KNTIRELV IN' METAL, 



With Removable Bellow? Front, giving an open stage if reqaired 



for Science Worlc, well ventilated "Steam Proof" Condenser, 



"Miniature" Semi-encIo;ed Aic Lamp, Resistance, &c. 



In Case Complete £7 12s. 6d. 



(Woodcut in course of preparation.) 



Tbis is probably the very finest value in Optical Lanterns for Class 

 Room Work that has ever yet been put on the Market. 



;r,--.V, -if I'liyluiilars, tir call and sec the Instniincitt in Messrs. 



XEiV: 





AV 



OPTICAL & DEMONSTRATION SHOWROOMS, 



At 72 WICMORE STREET, LONDON, W. 



Late at 3 Fleet Stsf.et, E,C. (Two minutes' walk from 



Bond Street Station, C,L,R.) 



By Royal Warrant to H.M. the King and the CcrverKment. 



STUDY 



THE LENS 



It is the Key to Success in Photography. 



Who can eitpect to excel who does not understand 

 how to use the diaphragm, the swins; back, the 

 rising front, focussing scale, &c., &c, ? All such 

 questions are lucidly and simply explained in 



" PHOTOGRAPHIC LENSES : 



A SIMPLE TREATISE." 



350 pages, 4+ ]>lates, 

 illustrations 



numerous ^iagran 



cloth bound. 



. OC J. DLL.IV, L.td., London. E.ci 



REYNOLDS & BRANSON, Ltd. 



^RYSTOS" OPEN STAGE LANTERN. 



With 



•iide door and 



Com pie 



Body (suitable lor any illuminani nvith 

 sight hole?, walnut base, meniscus co; 

 objective of superior quality 2^ in. < 

 9, or 12 in. focus, with rack and pinion. 



iravelltng case, but without burner ... ... £5 12 



Phoenix" Arc Lamp for above extra 2 2 



For Optical Lanterns of other designs, see Catalogue, 

 224 pages, post free. 



14 CoiYmn.ei?ci£i.l Stix*eei;, I^eeds. 



NEGRETTI & ZAMBRA'S 

 RAIN GAUGES. 



The " Hyetograph " 



is a Recording 



Rain Gauge that is 



approved by the 



highest authorities. 



Price, complete, with 

 charts, pen, and ink, 



£6 15 



/lluslralid Price List of 

 Rain Gauges, etc.. sent 

 post free on request. 



38 Holborn Viaduct. 



London. E.G. 



45 Cornhill, E.G. 



122 Regent St., W. 



JAN 211913 



