

A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 



" To the solid ground 

 {'I Nature trusts the mind which builds for aye" — Wordsworth. 





John J. Griffin & Sons, L 



KINGSWAY, LONDON, W.C. 



Scientif ic Instrument m akers. 



TH ' rt v\^ 0W e^ 



ftV \ (C V. Bovs's Patent.) V^ ^>. 



<a lT^ For Studying Liquid Films. Wj ^ 



Marvellous 

 Colour- 

 combinations 

 of Infinite 

 Variety. 



Unique 



Effects 



of 



Wonderful 



Beauty. 



Pr»lf»*» Oi*^/— Packing and Carriage 



.Trice .*££>/- in United Kingdom, 1/- 



Inclur/ing 2 Bottles of special Soap Solution and Full Instructions. 



REYNOLDS & BRANSON, Ltd. 



Awards- Gold Medals. London, Turin, and Allahabad. 

 Grand Prix, Turin. 



"RYSTOS" OPTICAL BEN CM 



Por use with 



the 



Stroud & Rendell 



Science Lantern. 



W^M 



Optical Bench for lantern, one metre long, wnhout fittings, £1 10 0. 



Sliding tables, 3/6 each. Lens holders, 4/6. Adjustable slit, 4/9. 



Screen holder, 4/- Standard candle holder, 1/- Circular table, 1/6. 



Screen with gauze, 3/6. Rotating holders for nicol prisms graduated at 



o°, oo", 180° and 270°, 9/- Glass prism 60°, mounted in special holder, 4/6. 



Half-metre extension with foot, 12/6. 



The above can also be u«ed without the lanltrn as an ordinary optical 



bench, and any part can be supplied separa'e'y. 



,Yeu> Catalogue of Optical Lanterns and Accessory Apparatus for the 



" S. * R." lantern, post free. 



14 COMMERCIAL. STREET, I.KEDS. 



The 



" PUBLIC 

 SCHOOL" 

 Set of 

 Meteoro- 

 logical 

 Instruments 



is a complete 

 simple Climatological Station at a moderate price. 

 The Set comprises — Maximum and Minimum 

 Thermometers, Hygrometer, Screen, Ram Gauge, 

 Pocket Book, and " Hints to Meteo. Observers." 

 Kew certificates supplied if required. 



NEGRETTI & Z AM BRA Descriptive 



Scientific Instrument Makers. P^phlet 



Holborn Viaduct. London. E.C. !*", r,„„ 



City Branch : 45 Comhill, E.C. &>**■""* 



West End : 122 Regent St., W. ° n request. 



