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B a u s c h & Lomb Optical Company an image 6 feet wide at a distance of 20 feet, should be used. This burner consumes 1 /4 cubic feet of gas per hour. Oxyhydrogen Burner The oxyhydrogen burner gives greater illumination than the acetylene, but is also somewhat more expensive to operate. Formerly a lime which had to be revolved was employed. In this new burner a pastil of special composition is used, producing a very white and satisfactory light. Rheostats We construct our rheostats to meet the strictest requirements of fireboards and under- writers and they have been approved by the National Board of Fire Underwriters’ Laboratory of Chicago. The wire in the resistance coils Figure 1—4jTAmpere Rheostat, has practically no temperature coefficient and No. 4452. W ill not deteriorate with frequent heating and cooling. The cases are of perforated metal thus providing for the freest possible air circulation among the coils. There are no exposed contact points, and every means of insuring safety has been taken advantage of. The coils in rheostats of 15 amperes capacity and over are wound on asbestos board strips to prevent sagging or possible contact between coils. The coils in the 4J4-ampere rheostats are carried on porcelain spools. The 4/4-ampere rheostats can be used satisfactorily with the electric wiring usually found in private houses, connecting with the ordinary lamp socket. Those of higher capacity generally require special wiring. When ordering be sure to specify voltage. 106