May 5, 1916. THE COLLIERY GUARDIAN. 865 Cleaner Coal and Fewer Roof Accidents. are but two of the results of a good clear light. But its cost should not be prohibitive nor its service uncertain. HAILWOOD COMBUSTION TUBE OIL LAMP answers these requirements, and, in fact, all others—it is the ideal lamp for the miner. The Hailwood has gas-detecting properties, and greater candle power than an electric lamp. It is magnetically unlocked, electrically ignited, gives a clear white flame, and is not readily smoked up. Its scientific construction and the fact that it may be tilted without being extin- guished, are important advantages. Approved by British and French Governments. Send for the circular and learn why 64,000 Hailwood Lamps have been put to work during the last 18 months in preference to electric lamps. ACKROYD & BEST LTD., Beacon Works, MORI FY YORKS. B E Sail* OMSUJ TUB Block showing Hailwood Combustion Tube with small glass ready to be passed into and supported by spring arms. he? V I Block showing Com- bustion Tube in position in usual gauze and glass. . . JgSfc.A