Practical instructor and reference book for locomotive firemen and engineers: a practical treatise .. (1911)
Lockhart, Charles F. (Charles Fulton), b. 1872 · New York, The Norman W. Henley publishing co. · leaf 265
to the signal whistle. 698. The valve contains two operative parts: a rubberdiaphragm and signal valve stem. 699. Air pressure enters the valve above the diaphragm 262 THE AIR WHISTLE SIGNAL VALVE from the signal line through port d, thence through passagec, into chamber b, under the diaphragm.… … Fig. 88.—Air Whistle Signal Valve. The pressure in chamber b being the greatest, it forcesthe diaphragm to raise, unseating the signal valve stemio, allowing air to flow to the whistle, causing it to sound.The same reduction of signal pipe pressure which causedthe whistle to sound also caused the…
Locomotives
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