. Electric railway gazette . loads, and the first consideration should be totake them exactly on the second. Boiler-roomreadings may be taken at intervals of five minutes,cards should be taken from the engine at intervalsof two and a half minutes, with about two trac-ings on each card, generator readings being takenat the same time, while motor readings may betaken as frequently as each fifteen seconds. Definite plans for a test must always be madeand strictly adhered to ; no details can be over-looked without causing serious inaccuracies in theresults obtained. The changes in pipe fittings an
. Electric railway gazette . loads, and the first consideration should be totake them exactly on the second. Boiler-roomreadings may be taken at intervals of five minutes,cards should be taken from the engine at intervalsof two and a half minutes, with about two trac-ings on each card, generator readings being takenat the same time, while motor readings may betaken as frequently as each fifteen seconds. Definite plans for a test must always be madeand strictly adhered to ; no details can be over-looked without causing serious inaccuracies in theresults obtained. The changes in pipe fittings andall preparations for a test must be carefully studiedand a sufficient number of reliable men employed,because if one man fails to do the work assignedhim the entire results may be wholly withoutvalue. One competent man should he assignedto the duty of doing nothing except to see every-thing and remember all that he sees. His informa-tion will be valuable in working up the test. In the preliminary work engine valves shouldbe. Metropolitan West Side Elevated. Lake Street Elevated. Chicago and South Side Elevated (Allev L) Northwestern Elevated. (Projected.) ELEVATED RAILWAYS OF CHICAGO. ing millions of dollars to the aggregate value of theelevated railway securities. Such evidently is thebelief of the Chicago Stock Exchange, as upon theannouncement that the agreement had been made,securities tooka sharp advance. carefully adjusted and the interior and exterior ofthe boilers personally inspected, as the least coat-ing of soot or scale makes a large difference in theevaporation. All piping valves must be carefully * Electrical World, S46 STREET RAILWAY GAZETTE. December 15,189-!. tested, and if any faults are found the valvesshould have blanks inserted. The three most accurate men should be assignedto the duty of weighing water and coal and read-ing voltage and amperage at the switchboard, be-cause these three iiems form the foundation forthe test. A set of friction cards should b
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