May 9, 1913. THE COLLIERY GUARDIAN. 989 JOHN SHAW LTD., Yorkshire Wire Rope Works, SHEFFIELD, ENGLAND. STEEL WIRE ROPES OF EVERY DESCRIPTION. JOHN SHAW (AUSTRALIA) LD., 445, Kent Street, Sydney. FOUNDED 1895. THE QUARRY, The Oksan of the Stone, Marble, Slate, Lime, Clay and Cement Trades, CORES ’ CORESI CORES’ CORES ! Price— 6d» monthly. Annual Subscription, 7s. 6d. post free (payable in advance). Offices— 30 & 31, Furnival Street, Holborn, London, E.C. THE New Calyx Drill & Boring Co. Ld. 120, East Ferry Road, Millwall LONDON, E. Boring for Coal and Mineral Prospecting, Artesian Weils, &c Large Cores a Speciality. Patent Appliances for ensuring the verticality of bore. Contracts completed to date— 60,000 ft., from 500 to 3,600 ft. Core of 8 in. dia. has been produced at a depth of 3,000 ft. by this system. Estimates Given for any depth cr size. Complete Drilling Outfits Supplied for Foreign Contracts. OVERWINDS CALEDONIA CONTROLLER WALKER’S PATENTS GIVES FULL PROTECTION AGAINST OVERWINDS FROM ALL CAUSES • ■ • SIMPLE EFFECTIVE • • - FULL PARTICULARS ON APPLICATION w iVR/r/wr, p/epsa pnnPF