

.€H^ 



A POPULAR ILLUSTRATED WEEKLY JOURNAL OF SCIENCE. 



[Registered at the General Post Office as a Newspaper.] 



.. IL— No. i. 



FRIDAY, JULY 6th, i388. 



[Weekly, Price 3d. 

 By Post, 3Jd. 



ht your House, 



by 

 etricity 

 fom /v ^ 



For 

 Estimates 



^^S» / apply to 



>Q~/^E LECTRiCAL 

 P OWER STORACE 



Co., Ld. 

 r 4,GREATWlNCHESTERST., 



LONDON, E.C? 



Medal Awarded at the International Inventions 

 Exhibition. 



Price from 253. 



CSIMILE PRINTING. 



Permanent Black or any Colour. 



our own Notices, Circulars, Price Lists, etc., 



BY ZHCCATO'S PATENT 



APOGRAPH. 



aple. Cleanly, Reliable, Cheap. 

 for Itself after a Few Times Using. 

 X) COPIES can be produced from One 

 g. Pre^s not required. 



particulars, with Specimens of Work, 

 tonials, etc., on application to the Mann- 

 ers and Patentees — 



ZUCCATO &. WOLFF, 



arterhouse Street, Holborn Viaduct, 

 London, E.C. 



IPINALL'S ENAMEL 



(BEGItiTEBED.) 

 BS EXQUISITE. SURFACE LIKE PORCELAIN/. 



S TESTIMONIAL from a total 

 stranger speaks for itself. 



tact from " Diana's Diary," The Bat, March 

 87. 



se ' Aspinall's Enamel Paint.' It is a most faact- 

 nmusement, and so easy: I only lay the paint on 

 large painter's brush. It requires no water or 

 ig and is bought ready (or use; and if a little 

 id pains be taken in the use, the rurnitum, when 

 I, looks like new, with a ovely varnish. My room 

 with blue. But it can be bought In red, greeu, 

 "ana many other colours." 

 ^INALL'8 ENAMEL. 



For Home Renovating. 



For House Decorating. 



For Yacht Beautifying. 



For Tennis Lawn Ornamenting. 



For Wicker, Wood, Iron, or Stucco. 



For Inside or Outside Work. 



by al i respectable 8hops and Stores throughout 

 ngdom; or sent in Tin, post free, 8s. and la. m. 

 .•pinall's Enamel Works, Peckhcm, London, S.E. 



PERKEN, SON, 3c RAYMENT 



Manufacture for 

 the Trade ONLY. 



"OPTIMUS" 



Rrt.'ID 



LENSES, 



l CAMERAS 

 for field 

 AND STUDIO 



"OPTIMUS" 



MAGIC 



LANTERNS, 



SLIDES, 



And Accessories. 



99, Hatton Garden, London. 



FREDERICK WALKER & HYDE, 



Patent Agents, 



Consulting Engineers & Electricians, 



4, LITTLE MOORFIE LDS, E.C. 



Estimates, and Working Drawings for General 



Millwork and Electrical Plant- 

 Consultations, Opinions, Tests. 



MODERATE AND FIXED CHARGES. 

 LIST POST FREE ON APPLICATION. 



WOLFF'S 



INKS AND LIQUID GUMS, 



The Best and Cheapest 

 in the Market. 



Sold by all Wholesale Stationers In the 

 United Kingdom. 



This Alloy is an Improved Brass, hard, durable' 

 and strong as Mild Steel; of a beautiful gold 

 colour, when melted it produces sound castings 

 of fine grain. It can be forged hot or cold, and 

 takes a verv high polish. DELTA METAL is 

 being largely used for all kinds of machinery, 

 house, door and harness fittings, stair-plates, &c. 



For Prices of Ingots, Plates, Sheets, Rods, 

 Wire, etc., apply to 



ALEXANDER DICK, 



PATENTEE & MANUFACTURER, 

 no, CANNON STREET, LONDON. 

 Telegraphic Address — "Delta, London." 



Photographic Apparatus and 

 Chemical Co., Limited, 



15, Barbican, and Australian Avenue, E.C. 



CAMERAS, LENSES, AND APPARATUS 



Of the Best London Workmanship. 



CATALOGUES FREE ON APPLICATION. 



INVALUABLE TO AMATEURS I 



OTJB 



Victoria Dry Plate Developer, 



" Registered." 



A Developer in one Solution. Easily worked, 

 and readily developing plates, paper, or opals. 



In Bottles, Is. and Is. 9d. tach. 

 Sample Bottles sent on receipt of postage, 3d. 



SCHOOL OF 



ELECTR1GAL ENGINEERING 



12, Princes Street, Hanover Square, W. 



More than 3,;t00 PupilB have passed through its 

 course ol instruction, many of whom are now 

 flllins responsible and highly remunerative posi- 

 tions ia all parts of the world. 



For full purthulars fprafisj. terms, e*C, apply 

 personalty or by letter, to the Secretary, at aooxe. 



