clxxxvi 



NATURE 



[April lo, 1879 



NONA/ READY, 

 SECOND EDITION, 



GRIFFIN'S 



CHEMICAL HANDICRAFT. 



PRICE 4*. jd. POST FREE. 



A CATALOGUE OF CHEMICAL APPARATUS : 



ILLUSTRATED, CLASSIFIED DESCRIPTIVE. 



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



Most Complete and Cheapest List of Apparatus. 



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

 LONDON, W.C. 



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. 



Electrical Apparatus of all descriptions for Lecture Purposes 



Loaned out. 



FOR CLASS 



DEMON- 



APPARATUS 



STRATION 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. 



PROF. S. P. THOMPSON'S LANTERN 



SLIDE GALVANOMETER, 20s. 



EDISON'S ELECTRIC PEN £8 8s. 

 ELECTRIC and MAGNETIC APPA- 

 RATUS of aU Descriptions. 



New Lllustrated Catalogue of 60 pages post free 6 stamps. 

 Orders over ^n carriage paid to any part of the United Kingdom. 



MICROSCOPES, OBJECTIVES, &c. 



CENTENNIAL EXHIBITION, PHILADELPHIA. U.S.A. 



The Medal and Highest Award has been given for Design, 

 Construction, Optical Excellence, and Moderation in Price, to 



HENRY CROUCH, 



66, BARBICAN, LONDON, E.C. 



Fully Illustrated Catalogue and full Instructions by Post, 6 Stamps. 

 Mailed abroad free. 



HOW^ to MAKE a TELESCOPE, a MICRO- 



SCOPE, and a MAGIC LANTERN. How to TAKE a PHOTO- 

 GRAPH and PRINT a CARTE, see ILLUSTRATED CATALOGUE, 

 now ready, 3 stamps. Containing full direction for above, and how to 

 TRANSKER LANTERN SLIoES. 



J. LANCASTER & SON, Bull Street, Birmingham. 



The LANCASTER ELECTRIC LAMP, de- 

 vised by W. J. LANCASTER, F.C.S., F.R.A.S., Sc, in three sizes. 

 No. I, to bum 3 hours, £2 2S.; No. a, to bum 6 hours, £3 3s. ; largest 

 siie, £5 5s. Set of 20 Quart Bunsen's Cells, £4 4s. Model Electric 

 Lamp and 10 Cells, £2 12s. 6d. 



HOLLOWAYS OINTMENT 



A CERTAIN 

 REMEDY 



Tor BAD BBEASTS, OLD WOUNDS, and SOEES. If 

 effectually rubbed on the Neck and Chest, it cures SOEI 

 THSOATS, BSONCHITIS, COUGHS and COLDS; and fbr 

 GOUT, KEEUMATISK, and all Skin DiseasM it it ouhmU*^ 



W. L A D D & CO., 



Scientific Instrament Manufactarers 



(By Appointment to the Royal Institution 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 HOLTZ 

 ELECTRICAL MACHINE, with 4 to 12 Plates, in- 

 closed in a Mahogany and Glass Case. This instrument is 

 immediately available in any condition of the atmosphere. 

 Philosophical Apparatus of every Description. 



Illustrated Catalogue, Sixpence. 



EUDOLPH KOEiNiG, 



(DR. PHIL.) 

 MANUFACTURER OF 



ACOUSTICAL INSTRUMENTS. 



TO ILLUSTRATE THE LAWS 

 AND TO PRODUCE THE PHENOMENA OF SOUND. 



PARIS, 26, RUE DE POHTOISE. 



PRICE LISTS FREE. 



HORNE'S POMPEIAN DECORATIONS. 

 ROBERT HORNE, 



HOUSE DECORATOR and PAPER-HANGING 



MANUFACTURER, 



41, GRACECHURCH STREET, LONDON, E.C. 



By Special Appointment to His Majesty the King of Italy. 



THE MINIATURE MICROSCOPE LAMP 



(REGISTERED) 

 PRICE 14*. PORTABLE TIN CASE FOR DITTO, 2s. 6a. 



JAMES HOW & Co., 



SCIENTIFIC INSTRUMENT MAKERS, 



S, ST. BRIDE ST. {fate 2, Foster Lane), LONDON. 



172, 



O.T18LEYcgCo., 



OPTICIANS. 

 BROMPTON ROAD, S.W. 



(Close to South Kensinjjton Museum). 



THE PHONEIDOSCOPE 



An Instnimcnt for Observing the Colour-Figures of Liquid Fihns under th« 



action of Sonorous Vibrations. 

 Brine « visible demonstration of the Vibratory and Molecular Motion of a 

 Telephone Plate. . , 



The PHONEIDOSCOPE, with 3 Discs, Botde of Solution, DescnpUve 

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MANUFACTURED AND SOLD WHOLESALB AND ^^^'^^'^^ - _^ 



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

 TELEPHONIC ELECTRICITY. All MaterlaU suppUed for expe i- 



mental puri>oses. 

 Prke Lists of EUctrital and Acoustic Apparatus with Drawings and 

 Description of the Harmonofra/k, Post Free, 2d. 



