734 THE COLLIERY GUARDIAN April 14, 1916. Purchasers’ Guide to Advertisers’ Specialities—(continued). Sulphur Recovery Plant—Appawis d rhupfra- ' tion du souffre Coke Oven Construction Co. Ld., Sheffield ■ Coppde Co. (Gt. Britain) Ld., Jlingsway, W.C. Daglish, Robt., and Co. Ld., St. Helens, Lancs. Koppers’ Coke Oven & Bye-Product Co., Sheffield Superheaters—Surchauffeurs 1 Clarke, Chapman and Co. Ld., Gateshead-on-Tyne Pulsometer Engineering Co. Ld., Beading Surplus Steam Valves (Full Bore)—Soupapes auvapeur en trop plein Auld, D., and Sons, Whitevale Foundry, Glasgow Baldwin, James, and Co., Keighley, Yorks Hopkinson, J„ and Co. Ld., Huddersfield Boyles Ld., Irlam, Manchester SURVEYING (Books on)— Manuel d’arpentage • Thomas, Wm., Cambrian Mining School, Forth Surveying ( Instruction ) — Enseignemmt ; (arp entage) Thomas, Wm., Cambrian Mining School Forth Surveying Instrument Makers — Appareiis | d’arpentage Davis, John, and Son (Derby) Ld., Derby , Barling, W. H., 47, Finsbury Pavement, London Stanley, W. F., & Co. Ld., 286, High Holborn, W.C. I Thornton, A. G., Ld., King-st. West, Manchester SWITCH BOARDS—Tableaux de distribution I Davis, John, and Son (Derby) Ld„ Derby Haslam and Stretton Ld., Cardiff Holmes, J. H., and Co., Newcastle-on-Tyne SWITCH Gear—Commutateurs tlectriques ' Anderson, Boyes & Co. Ld., Motherwell, Scotland British Insulated and Helsby Cables Ld., Prescot Davis, John, and Son (Derby) Ld., Derby Haslam and Stretton Ld., Cardiff Holmes, J. H., and Co., Newcastle-on-Tyne Swivels (Ball-Bearing)—imertiion. a bales Youngs, Byland-street Works, Birmingham TAN KS —Reservoirs Bagnall, W. G., Ld., Stafford Daglish, Robert, and Co. Ld., St. Helens, Lancs. Goodall, Clayton and Co. Ld., Hunslet, Leeds Harvey, G. A., & Co. (Lndn.) Ld.,Woolwich-rd.,S.E. Head, Wrightson and Co. Ld., Stockton-on-Tees Isca Foundry Co. Ld., Newport, Mon. Mather and Platt Ld., Manchester Theedam, E. C., Ld., Dudley Ward, Thos. W., Ld., Albion Works, Sheffield Wright’s Forge and Engineering Co. Ld., Tipton Wood, John, and Sons Ld., Wigan Tachographs and Tachometers—Tacheometres Davis, John, and Son (Derby) Ld., Derby Tar Distilling Plant—installations a distiller ie goudron Coal Distillation Co., Middlesbrough Coke Oven Construction Co. Ld., Sheffield Copp^e Co. (Gt. Britain) Ld., Kings way, London Daglish, Robt., and Co. Ld., St. Helens, Lancs. Koppers’ Coke Oven & Bye-Product Jo., Sheffield Simon-Carves Ld., 20, Mount-street, Manchester TECHNICAL Education—Enseignement technologique Southern, T. A., Universal Mining School, Cardiff Thomas, Wm., Cambrian Mining School, Forth Telephones—TiUphmus British Insulated and Helsby Cables Ld., Prescot Davis, John, and Son (Derby) Ld., Derby Haslam and Stretton Ld., Cardiffi Timber (Colliery)—Roisages Baird, J. W., and Co., West Hartlepool Forslind, C. A., and Son, West Hartlepool Osbeck and Co., Newcastle-on-Lyne Tools—Outiis Fell, C. A., Dronfield, near Sheffield Hardy Patent Pick Co. Ld., Sheffield Howell & Co. Ld., Brook Steel Works, Sheffield Tangyes Ld., Cornwall Works, Birmingham Willcox, W. H., & Co. Ld., 32, Southwark-st., S.E. Tram and Wagon Corner Plates—Cormeres pour voitures Baker, John, and Son, Bilston, Staffs Chorley Railway Wagon Co. Ld., Chorley, Lancs. Theedam, E.C., Ld., Dudley Transformers (Electrical) — Tranifomatewt tlectriques Davis, John, and Son (Derby) Ld., Derby Transport Plant—Transporter Trommels—Trommels Barns, W., and Son, Globe Works, Holloway Johnson, Wm.,& Sons (Leeds) Ld., Armley, Leeds Spencer and Co. Ld., Melksham, Wilts Truck Shunting Plants — installations