Ixxviii 



NATURE 



IJuly 3, 1879 



MEDALS -PHILADELPHIA, 1876. MEDALS— PARIS, 1878. 



8ETH THOMAS CLOCK COMPANY, 



NEW YORK, CHICAGO, SAN FRANCISCO, and LONDON. 



MANUFACTURERS OF 



CALENDAR CLOCKS, REGULATORS for ASTRONOMICAL 



AND SCIENTIFIC PURPOSES, 



TURRET CLOCKS FOR LARGE BUILDINGS, 



AND 



HOUSE CLOCKS OF EVERY DESCRIPTION. 



Prices and Particulars from any respectable Watchmaker, or Wholesale atid for Shipment from 



R. M. MARPLES (SOLE AGENT), 

 16, WORSHIP STREET, LONDON, E.C. 



NEW ILLUSTRATED CATALOGUE of ELECTRIC 



SIGNALS, &c., with Instructions for Fixing. 1 50 Diagrams. Just cut, 

 post free, 6 Stamps. 



EDWARD PATERSON, 



Electrical Engineer and Scientific Apparatus Matmfacturer, 



3, BEDFORD COURT, COVENT GARDEN, LONDON. 



STEAM WORKS, GRAY'S INN ROAD. 



Experiments in Electric Lighting carried out. 



Electrical Apparatus of all Descriptions for Lecture Purposes Loaned 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 and INDICATORS. 

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



Fixing. 

 EDISON'S ELECTRIC PEN £i 8j. 



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. 



^ C. TISLEY cfe Co. 



OPTICIANS, '' 



172, 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, 10s. 6d. 



MANUrACTl/RED AND SOLD WHOLESALE AND RETAIL BV 



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



TELEPHONIC ELECTRICITY. All Materials supplied for experi- 

 mental purposes. 



Price Lists 0/ Electrical and Acoustic Apparatus^ with Dtawings and 

 Description of the Harrtiono^aph, Post Free, zd. 



HOILOWAYS OINTMENT 



A CERTAIN 



REMEDY 



For BAD BKEASTS, OLD WOUNDS, and SOKES. If 

 effectually rubbed on the Neck and Chest, it cures SOKE 

 IHEOATS, BKONCHITIS, COUGHS and COLDS; and for 

 GOUT, BHEUUATISM, a id all Skin Diseases it is oneanalled. 



BARCLAY & SON, 



138, REGENT STREET, LONDON. 



To Her Majesty and H.R.H. the Prince op 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. 



W. L A D D & CO., 



Scientific Instrument Manafactorers 



(By Afteintfiunt to tie Royal Itulitution 0/ 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 HOLTZ 

 ELECTRICAL MACHINE, with 4 to 12 Plates, in 

 closed in a Mahogany and Glass Case. This instrument is 

 immediatel); available in any condition of the atmosphere. 

 Philosophical Apparatus of every Description. 



Illustrated Catalogue, Sixpence. 



DIAMONDS AND OTHER PRECIOUS 



STONES. Scientific opinion givenai to GENUINENESS, PURITV 

 and VALUE — Bryck Wright, 90, Great Russell Street, Londos, 



