43^ 



SCIENTIFIC NEWS. 



[May 4, I? 



Eccles, Port Talbot. On the Mechanical 

 Appiirahis for Continuous Moulding at the 

 VVorhs of M. Godin, Guise ; by Mr. Jas, 

 Johnston, Manchester. On the Effect of 

 'Arsenic on Mild Steel ; by Mr. F. W. 

 Harbord, and Mr. A. E. Tucker, Bilston. 

 On the Manufacture of Ordnance cit Trubia; 

 by Major Cubilio, Trubia. 



Civil and Mechanical Engineers' Society, at 

 7 p.m.— General Meeting. 



Society of Arts, at 7 p.m. — Locks and Safes ; 

 by Mr. Samuel Cbatwood. 



Royal Microscopical Society, at 8 p.m. — 

 New Infusoria Flagellata from American 

 Fresh-Waters ; by Dr. A. C. Stokes. 

 Thursday, May lo. — Iron and Steel Institute, at 10.30 a.m. — On 

 the Melting of Wrought Iron or Steel 

 Scrap mixed with Fe7ro- Silicon in Cupola 

 Furnaces ; by M. F. Gautier, Paris. On the 

 Behaviour of Arsenic in Ores and Metals 

 during Smelting and Purification Pro- 

 cesses ; by Mr. John Pattinson, Newcastle- 

 on-Tyne, and Mr. J. E. Stead, Middles- 

 brough. On a New Instrument for the 

 Measurement of Colour, more especially as 

 applied to the Estimation of Carbon in 

 Steel; by Mr. H. Le Neve Foster, West 

 Hartlepool. 



London Mathematical Society, at 8 p.m. — 

 Sojne Theorems on Parallel Straight Lines, 

 together with some Attempts to Prove 

 Euclid's Twelfth Axiom ; by Mr. J. Cook 

 Wilson. On Cyclicaitts or Ternary Reci- 

 frocants and Allied Functions ; by Mr. E. 

 B. Elliott. On the Correlation of Two 

 Spaces each of Three Dimetzsions ; by Dr. 

 Hurst, F.R.S. 



Royal Institution, at 3 p.m. — The Chemical 

 Arts ; by Professor Dewar, F.R.S. 



Society of Telegraph Engineers and Electri- 

 cians, at 8 p.m. — On the Risks of Fire In- 

 cidental to Electric Lighting ; by Mr. W. 

 H. Preece, F.R.S. 

 Friday, May 11. — Royal Institution, at 9 p.m. — Some Curiotis 

 Properties of Metals and Alloys ; by Pro- 

 fessor Chandler Roberts Austen, F.R.S. 



Farkes Museum, at 8 p.m. — Nature of Nuis- 

 ances, including Nuisances the Abatement 

 of which is Difficult; by Mr. J. F. J. 

 Sykes, B.Sc. (Pub. Health) M.B. 



Balloon Society of Great Britain, at 8 p.m. 

 — Fire Prevention ; by Mr. E. C. Marriott. 



Royal United Service Institution, at 3 p.m. 

 — The Formation of Volunteer Field 

 Batteries for Home Defence ; by Captain 

 Francis G. Stone, R.A. 

 Saturday, May I2. — Royal Institution, at 3 p.m. — The Later 

 Works of Richard Wagner; by Mr. C. 

 Ambruster. 



Physical Society, at 3 p.m. — Note on the 

 Condition of Self-excitement in a Dynamo 

 Machine, and Note on the Conditions of 

 Self - Regulation in a constant Potential 

 Dynajno Machitie; by Professor S. P. 

 Thompson. Note on the Electrical Action 

 of Light ; by W. E. Ayrton. On the 

 Theory and Practice of Applying the 

 Dynamometer to the Investigation of Trans- 

 formers ; by Mr. T. H. Blakesley. On 

 Measuring the Electro- Motion Force of 

 Dynamos and Motors ; by Professor W. E. 

 Ayrton, F.R.S., and Professor J. Perry, 

 F.R.S. 



SALES. 



The Charge for Advertisements in this Column is Sixpence for the 

 first sixteen words, and Sixpence for every succeeding eight words. 



Advertisements for this Column should be received by first post on 

 Tuesday to insure insertion in the following number. 



Patterns. — 100 fretwork, 100 repousse, 200 turning, 300 stencils ; 

 I s. each lot. — Collins, Summerlays Place, Bath. 



Large Assortment of Lathes, Planers, Drilling, Milling, 



and various new inventions and tools. — Britannia Company, 

 100, Houndsditch London. — All letters, Britannia Tool Factory, 

 Colchester, England. Makers to the British Government. 



Brass Work, casting, turning, fitting, bronzing, plating, 

 lacquering, stamping, piercing, spinning ; anything intricate to 

 manufacture, new ideas inventions, patents. — MoRLEY Hall 

 Works, Trindale, Hackney. 



Rubber Stamps, any name, gd.; tip top or automatons, is. 6d. 

 — F. Walton, 135, Langsett Road, Sheffield. 



Microscopic Objects. — Hundreds cheap, including gor- 

 geous polarizing crystals. List free. — Henry Ebbage, 344, Cale- 

 donian Road, London. 



New Book on the Lathe, with notice of new appliances, metal 

 spinning, milling, etc., in an ordinary lathe ; 3s. post free. — 

 Britannia Company, Colchester. 



Chisel Steel, i to 5 feet bars, | to \\ octagon, 13s. per cwt. — 

 Gilbert, Oxford Road, Sheffield. 



Best Cast Steel for tools, taps, and dies, drills, 6d. per lb. — 

 Gilbert, Oxford Road, Sheffield. 



Rubber Stamps for business or private use ; excellence 

 guaranteed ; lists id.— A. H. Pashley, 12-I4, Ecclesall Road, 

 Sheffield. 



Electro - Plating and Gilding successfully taught. Every 

 requisite supplied. — Address, Henric, 234, Great Colmore-street, 

 Birmingham. 



Practical Hints on Electro-Plating, etc. — i stamp. — 

 Address, Henric, 234, Great Colmore-street, Birmingham. 



Dynamo, 120-candle power, improved armature, iocs. Photo. 

 5 stamps. — D. Walton, Hebden Bridge, Yorkshire. 



Dynamo, 6o-candles, improved armature, 45s. ; photo. 5 stamps. 

 Castings, lamps, etc. ; wire from is. 4d. per lb. 



Dynamo, 30-candles, 28s. ; lo-candles, 20s. Photo. 5 stamps 

 each — D. Walton, Hebden Bridge, Yorkshire. 



Meerschaum and Briar Pipes Repaired, Mounted, or cased, 

 ambers fitted. — W. George, 324, Essex Road, Islington, London. 



Fretwork, Carving, Turning, Woods, Tools, and all 

 requisites. Catalogue with 700 illustrations, 6 stamps.— Hargek, 

 Bros., Settle. 



Second-hand Lathes, and other tools, offered cheap ; on 

 view, Britannia Co., 100, Houndsditch, London. — Send 2 stamps 

 for Hst, to Britannia Works, Colchester. 



" Inventors' and Manufacturers' Patent and Trade Mark 

 Pocket Guide," by G. C. Marks, C.E., 13, Temple Street, 

 Birmingham. Four stamps. 



"Sheet Metal Worker's Instructor," Warn's; few copies, 

 cheap, covers slightly soiled. — 94, St. Augustine's Road, N.W. 



Minerals, Fossils (Carboniferous, Lias), 12 specimens, 

 2s. 6d. ; polished specimens, 6d. to gd. — C. Wardingley, Black- 

 wood Crescent, Edinburgh. 



" Dynamo Construction for Amateurs and Engineers," 

 illustrated pamphlet, post free, is. — Alfred Crofts, Electrician, 

 Dover. 



Cameras and Apparatus. Good workmanship; low prices. 

 Price list free. — J. Braine, 22, Bedford Terrace, Moray Road, 

 Holloway. 



Patterns : 100 Fretwork, 100 Repousse, 200 Turning, 300 

 Stensils. is. each lot. — Collins, Summerlays Place, Bath. 



EXCHANGES. 



Exchange Notices will be inserted in this Column at the rate of 

 Sixpence for the first twenty-four words, and Threepence for 

 every succeeding eight words. 



Advertisements for this Column should be received by first post on 

 Tuesday to insure insertion in the following nvjnber. 



X, Electro-Plating and Gilding taught to perfection; system 

 inexpensive ; distance no object ; exchange for anything useful 

 (stamp).— Perks, 47, Alexandra Road, Richmond, Surrey. 



SELECTED BOOKS. 



Electric Light Arithmetic. By R. E. Day, M.A., Evening 

 Lecturer in Experimental Physics at King's College, 

 London : Macmillan and Co. Frice 2S. 



Tea Cultivation and Manufacture. By E. Money. Fourth 

 edition. Whittingham. Price los. 6d. 



