March 10, 1916. THE COLLIERY GUARDIAN. 485 Wrought Iron and Steel Tubes. SPECIAL JOINT. These Tubes are specially suitable for mines, being both light and strong The Joint, as illustrated, can be easily connected, and a tube can be removed without disturbing the run. Fittings of all kinds supplied. Improved Albion Loose Flange Joint. STEWARTS and LLOYDS LTD., PIT PROPS. We manufacture Tubular Steel Pit Props, which are exceptionally strong and durable. They can be used repeatedly and have a high factor of safety. Lists sent on application. GLASGOW—41, Oswald Street. BIRMINGHAM-Broad Street Chambers. LONDON—Winchester House, Old Broad Street. POLE LINE MATERIALS Copper Wire and Strands, Insulators, Ironwork, Poles and Cross Arms, Guard and Stay Wires, Lightning Arresters, Earth Plates, &c. BRITISH INSULATED & HELSBY CABLES LTD PRESCOT, Lancashire.