. The railroad and engineering journal . The steam admission valve should be balanced, and itshould be placed as near as possible to the hammer, orbetter, immediately in front of the steam-chest, and shouldbe so arranged that the hammerman can open or close itby a lever. Moreover, close to the valve or the exhaustport the steam pipe should open out into a reservoir of ^y<^.36. large dimensions in such a way as to give a very quickdischarge and thus favor the descent of the reservoir should then, by means of a pipe of largesection, open directly into the air, and should have at i
. The railroad and engineering journal . The steam admission valve should be balanced, and itshould be placed as near as possible to the hammer, orbetter, immediately in front of the steam-chest, and shouldbe so arranged that the hammerman can open or close itby a lever. Moreover, close to the valve or the exhaustport the steam pipe should open out into a reservoir of ^y<^.36. large dimensions in such a way as to give a very quickdischarge and thus favor the descent of the reservoir should then, by means of a pipe of largesection, open directly into the air, and should have at itsbase a small pipe to permit the escape of condensed water. CHAPTER X. SAFETY APPARATUS. There is often used a safety apparatus, which is shownin fig. 35 : it is composed of a cylindrical part a placedabove the cylinder and closed by a cover. This part acarries two valves ; the one 6 below is free on its seat,and the upper S is held to its seat by springs whose ten-sion can be regulated at will. This upper valve permitsthe escape of compressed air. The piston in descendmgdraws in the air from the outside through the valve 5, andthis air is compressed above the piston, m its ascendingcourse, in such a way as to form a cushion, preventing anyaccident in the case of any breakage of the piston-rod ; 354 THE RAILROAD AND [August, 1888. moreover, its descending co This system
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