File:The Street railway journal (1905) (14574651247).jpg

Identifier: streetrailwayjo251905newy (find matches)
Title: The Street railway journal
Year: 1884 (1880s)
Authors:
Subjects: Street-railroads Electric railroads Transportation
Publisher: New York : McGraw Pub. Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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lersystems in property not protected in winter against freezing.The record of this valve in the past ten years and more hasbeen instrumental in convincing all interests that dry-pipesystems controlled by this valve are as reliable as wet-pipesystems. This valve is purely mechanical in operation, and is not de- pendent upon springs, diaphragms or weights. The ratio of theair to the water is sufficient to hold the valve closed against anywater pressure with only 15 lbs. of air. The levers cannotremain in position unless air is on the system, and the valvecan be quickly tested by turning the wheel on the drain valve.An important feature, said to be embodied only in this dry-pipevalve, is the anti-water column, which makes it impossible tocolumn the valve, as the air line from the air cup in the valveis carried to a point above the first floor and into the riser pipe. By the use of this device the air, to release the leverage sys-tem, is drained through the anti-water column fixtures, and
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FIG. 3.—DRY-PIPE VALVE PLACED BETWEEN OUTSIDE WATERSUPPLY AND INSIDE AIR SYSTEM OF THE SPRINKLER PIPES not through the lower riser pipe or air-valve chamber, wheredrainings from the system used as wet pipe in summer, as isoften the case, might accumulate a water supply above thecheck valve into the system that would seriously interfere withor retard the opening of the valve. The simplicity of construction allows of the quick resettingof valve after it has been tripped or opened, and no parts re-quire any systematic renewing. A valve shield incases allexterior working parts or levers. ■ NEW TRACKLESS TROLLEY LINE IN ITALY The Societa Italiana per Trazione Elettrica Ing., Meriggi,Diaz & Company, of Milan, has been given a contract for theconstruction of a trackless trolley bus line, 16 km (10 miles)in length, between Spezia and Portovenere. Three buses willbe run. The overhead material is being supplied by the OhioBrass Company. A representative of the Post-Office Department in

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