July 23, 1915. THE COLLIERY GUARDIAN 199 Koppers’ Coke Oven Is undoubtedly the most successful Bye-Product Oven on the market. Since its introduction a little over 10 years ago there have been built 12,500 KOPPERS’ OYENS. KOPPERS’ OVENS ARE AT WORK HEATED BY PRODUCER GAS AND BLAST FURNACE GAS. KOPPERS’ DIRECT RECOVERY PROCESS IS THE SIMPLEST AND MOST EFFICIENT SYSTEM OF AMMONIA RECOVERY. PLANTS ERECTED FOR THE RECOVERY OF BENZOL & TOLUOL, FOR TAR DISTILLATION & THE MANUFACTURE OF SULPHURIC ACID. Full particulars on application to — —- — The Koppers” Coke Oven and Bye-Product Co., 301, GLOSSOP ROAD, SHEFFIELD. •‘HTW X TH may be 8O» but 8ome officials “get tired of waiting till -*■ A the Home Office forces us to adopt shaft safety tackle/’ and there comes a time when every shaft pit manager or engineer “ would dearly like to have Cage Arresters on their Cages,” or shaftmen “ would like one of them Holdemrite things;” officials **get ashamed at looking at their unguarded cages,” or of allowing their shaftmen to be without proper safety belts.” So it happens, I’ve designed and sold more cage and men arresters in the shaft than ALL the other 1,600 British inventors put together. Why ? Well,first the things are ALL BIGHT; then I’m the only one of 1,600 inventors that has confidence in British mining engineers’ willingness to adopt any good thing for safety in the shaft,” and some seize the chance of getting things on approval. You see the man with the right goods wins all arguments, and a penny letter easily gets the proper things for safety. Take the latest. The HOLDEMTITE is a proper Safety Belt-Rig for shaft and high scaffold meu. All the fixings and the sling (A) are at the back. The man is Right before, and after he slips is held by the strong parts of his body. It is 3 lb. weight, 5,000 lb. strength. Price £12 per doz. Then the HOLDEMUPRITE is really a combined (1) flexible Safety Cage to ride men upright up and down narrow shafts, chimneys, street manholes, etc.; (2) Safety Belt-Rig; (3) Bosun’s Chair in which a man can SIT or STAND any length of time to do any work in shafts, on buildings, chimneys, etc. You can raise a dozen men in an emergency. Price is 30s. each, £14 per doz. You see, with these and other Hanley appliances, we can easily clean the pit shaft of its daily disasters and—well its an order-book man’s question.— A SAFETY FIRST IN THE SHAFT OFFICIALS’ question. ALL ■ RIGHT CAGE ARRESTERS ; ROPE and GUIDE DAPPLES and TENSION GEARS, SAFETY HOOKS ; HOLDEM- RITES and Holdemwells (Safety Clips). Also CORNER PLATES and SIDE BRACKETS for wood pit tubs. Details & prices, A* HANLEY, 21, Alpha Rd., Bristol. Price 3s. 6d. Post Free. A Practical Handbook for Colliery Electricians. ELECTRIC CIRCUIT PROBLEMS IJNT MINES AND FACTORIES. By ELLIS H. CRAPPEB, B.Eng., M.I.E.E., Head of the Department of Electrical Engineering at the University of Sheffield. THE COLLIERY GUARDIAN CO. LTD., 30 & 31, Furnival Street, Holborn, London, E.C. THOMAS SUMMERSON & SONS LTD ALBERT WORKS, DARLINGTON. “The Shipping World.” WEEKLY. ILLUSTRATED. PRICE 6d. Annual Subscription (Post Free): UNITED KINGDOM, 218. FOREIGN COUNTRIES, 28s. Sidings Contracted for Complete PRINCIPAL FEATURES: CURRENT EVENTS, by the Editor, on Trade, Commerce, and all Shipping and Commercial Questions, especially, at this time, in connection with the War. SHIPPING in PARLIAMENT, by Special Representative. WAR RISKS, by an Expert in Marine Insurance. SHIP SALES and CONTRACTS. NEPTUNE’S MAIL, with News and Notes about the War and other matters. ILLUSTRATED ARTICLES. TECHNICAL ARTICLES, by “ An M.I.N.A.” NAVAL and ENGINEERING NOTES. REPORTS from the SHIPPING CENTRES. REPORTS on FREIGHTS, whether affected by the War or not. MARINE INSURANCE NOTES (of special interest at this time). TRADE and FINANCE. LAUNCHES and TRIAL TRIPS. MANUFACTURERS of SWITCHES and CROSSINGS, CHAIRS, SPIKES, FISH PLATES, PLATELAYERS’ TOOLS t GENERAL CASTINGS. FISH PLATES and BOLTS for various sections of Rail kept in Stock. First-class Medals— Paris, 1885; London, 1862. “SHELTON” IRON. “SHELTON” STEEL C=J “GRANVILLE” PIG IRON « Gold Medals— Paris, 1878; Melbourne, 1881. Offices of the “Shipping World Ltd.” Effingham House, Arundel Street,