March 13, 1879] 



NATURE 



cli 



EUDOLPH KOENIG, 



(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. 



THE MINIATURE MICROSCOPE LAMP 



(REGISTERED) 

 PRICE 14*. PORTABLE TIN CASE FOR DITTO, m. t<L 



JAMES HOW & Co., 

 SCIENTIFIC INSTRUMENT MAKERS, 



S, ST. BRIDE ST. (late 2, Foster Lane), LOXVO.V. 



^ O. TtSLEY & Co. 



ORTICIANS, *' 

 X72, BROMPTON ROAD, S.W. 



(Close to South Kensington Museum). 



THE PHONEIDOSCOPE 



An Ii>5trainem for Obserring the Coloor-Figtires of Liquid Films tmder the 



action of Sonorous Vibrations. 



Being « 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. lox. 6d. 



MAJCUFACTUBED AKD SOLD WHOLMALK AND RKTAIL BY 



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

 TELEPHONIC ELECTRICITY. All Hatotals supplied for experi- 

 mental purposes 



Pr:\e Lzsii of Electrical and Acoustic Apparatus, vjitk DraTuings atid 

 Description 0/ the Harmonozraph, Pest hrce, 2d. 



JAMES WOOLLEY, SONS, & CO., 



69, MARKET STREET, MANCHESTER. 



EAGLE INSURANCE COMPANY, 



79, PALL MALL. 

 For Lives only. Established 1S07. 

 Net Premioms and Interest ......_>..... ~. ;£ 396,818 



Accumulated Fimds .^.^^.^^^ — •^ ;C3,o83,28i 

 Also a Subscribed Capital o£ more than ... .....>.- Xr.500,000 



Reports, Prospectuses, and Forms may be had at the OfiBce. or from aa> 

 o£ the Company s Agents, post free. 



GEORGE HUMPHREYS. Actuary and Secretary. 



CHEMICAL & PHYSICAL APPARATUS 



BOTTLES, PURE CHEMICALS, 



And every requirement fear Sdence Classes, Private Study, or Buaitess- 

 Purposes. 



Illustrated Priced Catalogues post frte for six stamps. 



Carriage allowed to any station in England or Wales, on orders of 40*, 

 value and upwards. 



MOTTERSHEAD AND CO. 



7, EXCHANGE STREET, & 10, HALF MOON STREET, 

 MANCHESTER.. 



W. L A D D & CO., 



Scientific Instrument Maaofactnrers 



(By ApfHrinttrunt to tht Royal Institution of Great Britatn), 



II & 12, BEAK STREET, REGENT STREET, W. 



BYRNE'S PATENT COMPOUND PLATE PNEU- 

 MATIC BATTERY for Cautery and general purposes. 



EDMUNDS' PHONOSCOPE for makuig 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. 



EDWARD PATERSON, 



EkctrUal Engineer and Sciaitific Apparatus Manu/aciureTf 



3. BEDFORD COURT, COVENT GARDEN, LONDON. 



STEAM WORKS, GR.A.Y'S INN ROAD. 



Experiments in Electric Lighting carried out 



Electrtcal Apparatus of all dacriptions for Lecture Purposes 



Loaned out. 



FOR CLASS 



DEMON- 



CHEMICAL APPARATUS AND REAGENTS 



For Lecture and Class Demonstration, Laboratory Instruction, &c. 



SETS OF APPARATUS AND CHEMICALS 



For the various Public Examinations. 



Portable Chemical Cabinets adapted for priuite study. 



Price Lists on Application. 



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 luly. 



DIAMONDS AND OTHER PRECIOUS 



STONES. Scientific ojxniongivenaj to GKKUIN"ENES<= PURITY 

 a»d VALUE.— Bhycb Wrigkt, 50, Great RusseU Street, Locdon. ' 



APPARATUS 



ST RATION and fcr SCIENCE SCHOOLS. 



ELECTRIC LIGHT APPARATUS. 

 SIEMEN'S and GRAMME'S DYNAMO 



MACHINES ar.d LAMPS for Hje and Purchase. 



LARGE ASSORTMENT of RUHMKORFF 



COILS a.nd 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, 20T. 



EDISON'S ELECTRIC PEN £8 8s. 

 ELECTRIC and MAGNETIC APPA- 



RATUS of all Descriptions. 

 Nno Illustrated Catalogue of 60 pages post free 6 stamps. 

 Orders over £i carriage paid to any part of the United Kingdom. 



HOLLOWAYS OINTMENT 



A CERTAIN' 

 REMEDY 



For BAD BBEASTS, OLD "WOUNDS, and SOEZS. If 

 effectually rubbed on the Heck and Chest, it cures S0££ 

 THEOATS, BEONCHITIS, COUGHS and COLDS; and for 

 GOUT, BHE¥]lATIS]f , aad all Skin Diieases it is unequalled^ 



