Ixx 



NATURE 



\yune 26, 1 87; 



BARCLAY & SON, 



138, REGENT STREET, LONDON. 



To Her Majesty and H.R.H. the Prince of Wales. 



DUPLEX LAMPS. 

 MODERATOR LAMPS. 



READING LAMPS. 



MICROSCOPE LAMPS. 



BEST COLZA OIL. 



A I KEROSINE OIL. 



WAX, SPERM, 



AND 



PARAFFINE CANDLES. 



ILLUSTRATED CATALOGUES POST FREE. 



NEW ILLUSTRATED CATALOGUE of ELECTRIC 



SIGNALS, &c., with Instructions for Fixing. 150 Diagrams. Justout, 

 post free, 6 Stamps. 



EDWARD PATERSON, 



Electrical Engineer and Scientific Apparatus Manufacturer, 



3, BEDFORD COURT, COVENT GARDEN, LONDON. 



STEAM WORKS, GRAY'S INN ROAD. 



Experiments in Electric Lighting carried out. 



Eleciricai Apparatus 0/ all Descriptions for Lecture Purposes Loatied out. 



APPARATUS for CLASS DEMONSTRATION and for SCIENCE 



SCHOOLS. 

 ELECTRIC LIGHT APPARATUS. 

 SIEMEN'S and GRAMME'S DYNAMO MACHINES and LAMPS 



for Hire and Purchase. 

 LARGE ASSORTMENT of RUHMKORFF COILS and VACUUM 



TUBES. 

 PROFESSOR HUGHES' MICROPHONE. 

 ELECTRIC BELLS .ind INDICATORS. 

 TELEPHONES and TELEPHONE CALL BELLS, WIRE, &c., for 



Fixing. 

 EDISON'S ELECTRIC PEN j£8 Zs. 



ELECTRIC and MAGNETIC APPARATUS of all Descriptions. 

 Illustrated Catalogue Electrical Apparatus, Part i. Post free, 6 Stamps, 

 do do Electric Signals, Part 2. Post free, 6 Stamps. 



S. C. TISLEY & Co. 



OPTI C I ANS, ' 



IT 2, BROMPTON ROAD, S.W. 



(Close to South Kensington Museum). 



THE PHONEIDOSCOPE 



An Instrument for Observing the Colour- Figures of Liquid Films under the 

 action of Sonorous Vibrations. 



Being a visible demonstration of the Vibratory and Molecular Motion of a 

 Telephone Plate. 



The PHONEIDOSCOPE, with 3 Discs, Bottle of Solution, Descriptive 

 Pamphlet, &c., in Cardboard Box, los. 6d. 



MANUFACTURED AND SOLD WHOLESALE AND RETAIL BY 



S. C. TISLEY & CO., 172, BROMPTON ROAD, LONDON, S.W, 



TELEPHONIC ELECTRICITY. All Materials supplied for expcri- 

 mental purposes. 



Price Lists of Electrical and Acotatic Apparatus^ with Drawings and 



Description of the Harmono^rafh^ Post Free^ 2d. 



W. L A D D & CO., 



Scientific Instrument Mannfactareri 



(JS)' Affointmtni to the Royal Tnstttutim of Great Britain), 



II & 12, BEAK STREET, REGENT STREET, W 



BYRNE'S PATENT COMPOUND PLATE PNEU. 

 MATIC BATTERY for Cautery and general purposes. 



EDMUNDS' PHONOSCOPE for making Vocal Vibra 

 tions visible in a Vacuum Tube. 



HUGHES' MICROPHONE. 



TELEPHONIC APPARATUS, &c. 



LADD'S IMPROVED SELF CHARGING HOLT5 

 ELECTRICAL MACHINE, with 4 to 12 Plates, in 

 closed in a Mahogany and Glass Ca.se. This instrument ii 

 immediately available in any condition of the atmosphere. 

 Philosophical Apparatus of every Description. 



llliistrated Cataloevit Sixpence. 



NOV^/ READY, 



SECOND EDITION, 



GRIFFIN'S 



CHEMICAL HANDICRAFT. 



PRICE 4». id. POST FREE. 



A CATALOGUE OF CHEMICAL APPARATUS: 



ILLUSTRATED, CLASSIFIED, DESCRIPTIVE. 



Demy 8vo, 480 pp., Illustrated with 1,600 Woodcuts. 



Most Complete and Cheapest List of Apparatus. 



JOHN J. GRIFFIN and SONS, 22, GARRICK STREET, 

 LONDON, W.C. 



JOHN NORMAN, 



MANUFACTURER OF 



MICROSCOPES, OBJECTS, CABINETS, 



TABLES, LAMPS, 



And all Glass Appliances for Microscopes, 



HAS OPENED NEW AND EXTENSIVE PREMISES AT 



123, Queen Victoria Street, E.G. 



Lists post free on application. 



DARTON'S 

 GUINEA ANEROID, 



With Thermometer. Dial is divide i off to 

 looths of an inch. Accurate and jensitiv;. 

 Each instrument tested in presence of 

 tomer, if required. Price iis. The s: 

 mounted in Carved Oak Frame, various 

 terns, 42s. and 63*. 



Illustrations and Prices on Apflii at:: 



F. DARTON & CO., Makers, 



45, ST. J O H N STREET, E.G. 



WORKS-ST. JOHN'S LAXE. 



MICROSC OPIC O BJECTS. 



Horn Sections, Blood Discs, Feathers, Hairs, Sections of Bone and Teeth, 

 Fish Scales, Anatomical Preparations fronn the Human Subject and Lower 

 Animals, Palates of Mollusca, Sections of Shells and Pearls, Polyzoa, whole 

 Insects, Parasites, parts of Insects, Ossicula, Spines, &c., of Echinodcr- 

 mata, Spicules of Sponges and Gorgonias, Foraminifera, Botanical Prepara- 

 tions, Diatomacesc, Salts, Crystals, Sections of P.ocks, Fossils, Minerals, 

 &c. 



Ochreous Iron in Moss-Hke Forms in Calcite, \s. 6d. post-free. 



Stellar Mica, or Canadian Phlogopite, \s. yl. post-free. 



Catalogues free. 



THOS. D. RUSSELL, 



48, ESSEX STREET, STRAND, LONDON, W.C. 



