May 1 1, I905 



St A TUkE 



C]^^:^===°^ 



YOST 



Swift, Quiet, and Convenient. 



[lluslratcd Booldct Post Free. 



The YOST TYPEWRITER CO, Ltd. 

 50 Holborn Viaduct, London, E.G. 



CoHffiipetitlioini 



First Prize - Five Guineas 

 Second „ - Three Gu n;as 

 Third „ - Two Guineas 



kir nL^;Llliv^_•^ <li 



nllvrc.l l.> 

 an.l I-., 

 ,,,e,l witl, 



.-.r 'TABLOID'.— 

 PYRO-METOL DEVELOPER 



Competition closes IVfay 15, 1905 



Entry forms and full particulars from 

 all chemists, or from 



BURKOUGHS WeLLCOMK AND Co. 



London, K.C. 



PHO. 123 



w. WILSON. THE SYTAM SYSTEM 



VERNIER 



MICROSCOPE. 



Horizontal and Vertical Scales ; 

 16 cm. in length. The microscope 

 rotates on a horizontal axis, and 

 can be clamped in any position. 

 One power and one Eye-piece. 



With Scales reading to •! mm. £6 10 

 „ 05 „ 7 



„ 02 ,, 7 10 



•01 .. 8 5 



1 BELMONT STREET, CHALK FARM, N.W. 



RADIUM BROMIDE 



OF THE HIGHEST ACTIVITY 

 IN 5 mg. TUBES. 



Only Sk. F'ew HTuibes left,. 



ARMBRECHT, NELSON & CO., 



71 & 73 DUKE STREET, GROSVENOR SQUARE, W. 



'Telephone : Gekrard, 494^. 



i8-inch Apps-Newton Coil for sale, in perfect 



condition. No trace of oxidation on the vulcanite. G. BowRON, 



Metallurgical Laboratory, well equipped for 



experimental work, lu let at low rent. One minute from Station. 

 Fifteen minutes to City. Apply Marshai-I- S: Co., Campbell WorkN. 

 Sloke Newington, N. (dose to Station, G.E.R.). Tel., 79 Dal-lon. 



Saves an incredible amount of wall space and 

 completely utilises dark corners, recesses, and 

 out-of-the-way places. 



Prevents crowding and confusion. 



Allows for extension as and when required. 



Always room for more, fience reorganisation 

 seldom or never necessary. 



Saves time, lightens work, and incre.ises comfort 

 by producing perfect order in the Laboratory, 

 Library, Study, Home, Office. &e. 



SOIVIIB: S'VTAIVI FITTINGS. 



1. THE BOTTLE ELEMENT. 



One hundred 4 oz bottles are arranged in one 

 Sytam Bottle ■ Element occupying less than 

 1 sq. ft. of wall space, eacn bottle is instantly 

 located, removed or replaced, and any size from 

 !oz. to a 'Winchester can be accommodated in 

 one and the same element. 



2. THE CLOSED-FRONT BOOK ELEMENT. 



3. THE OPEN-FRONT BOOK ELEMENT. 



4. THE AUTHOR'S PILE. 



For division of subject into headings, chapters 

 or sections. 



5. THE TWIN DESK TRAYS. 



6. THE PAMPHLET FILE. 



THE SYT^SivrnTTlNGS CO., 



1 18 & 19 BASINGHALL BUILDINGS, LEEDS. 



