_a._ Five brass drain cocks, each with a lever handle and of 1/2-inch bore, are to be provided, and located one on each end of each water cylinder, and one above the upper valve deck. Care should be taken to select a pattern of cock whose passageway is the practical equivalent of a 1/2-inch hole. Some patterns of 1/2-inch commercial cocks although threaded for 1/2-inch pipe thread have but a 1/4-inch hole through them. Such are not acceptable. [Footnote D: Such detachable rubber check valves are now made up in regular form by the George F. Blake Mfg. Co., East Cambridge, Mass.] TESTS FOR ACCEPTANCE. 48. TEST FOR SMOOTHNESS OF ACTION. _a._ Provide outlets for the water; start the pump slowly, gradually open steam-throttle to bring the pump to full speed. The pump should run smoothly at the rated full speed of 70 revolutions per minute (or 60 revolutions if a 1,500-gallon pump) with full length of stroke, and meanwhile maintain a water pressure of 100 lbs. per square inch. If the hose lines are short, or discharge is too free, partly close the water outlet valves, thus throwing an extra back pressure on the pump equivalent to that which would be produced through a greater length of hose. During this trial it is preferable to discharge the water through lines of 2-1/2-inch cotton rubber-lined hose, preferably each 150 feet long, each connected directly to the hose outlets on the pump, and each line having a 1-1/8-inch smooth nozzle at its outer end. Two lines should be connected for a 500-gallon pump, three for a 750, and so on, having as many lines as rating of pump requires. A hose line 150 feet long, with an inside surface of average smoothness, and with a 1-1/8-inch nozzle attached, will require about 80 pounds pressure at the pump to discharge 250 gallons per minute, and the nozzle pressure will be about 45 pounds. Therefore, with lines attached as above, a pressure at the pump of about 80 pounds should represent a discharge about equal to the rated capacity of the pump, and would ordinarily correspond with the rated full speed revolutions. If the pump runs smoothly under these conditions, it is well to open the throttle somewhat further, and bring the pressure at the pump up to 100 pounds. This will give a discharge of about 280 gallons per stream, or about 12 per cent. in excess of the rated capacity. The revolutions will, of course, correspondingly increase, and under all ordinary conditions a pump should run smoothly at this higher capacity though a little more vibration and pounding would be expected than when running simply at its rated speed.