Effect on entrapped air on the action of wet pipe alarm valves . -m— ^^^^ ^ f F —-- 1 1 1 > —Jh- 4-^- •1 -- t — - 1 t / ; ^ -^ ^ 1 , / ~ ^ : ^ / s -^^ -- ? - - -- ^ § ^ ? .?•???? 1 <§ . • • — »-9Ayr-^y/9^z. ^ — //o — u^ ~ — — /So — 0 ^?C^DS/f/rix-lffr -/TO 7 w- ^ o s ^ s ~ l.~, . J ~ .1 -r„j^r . r. — — I -??:- /•oo ?^•?--, ??--- S ???--, ? io ,,^ 4o i 1 Zo 0 —o >^<. ^3 *^» ~8= }iO ?
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Keywords: ., bo, bookcentury1900, bookdecade1900, bookideffectonentrappe00aher