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Topic: Backhead

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	No 21 Backhead Detail
		It was mounted to the large hole in the bottom of the backhead in the previous photo.
		The small dark spots between the hand holes are the stay bolts that hold the outer backhead to the inner ring seen in the previous photo.
		It is possible that the hole cut in the front of the cab after outshopping was a shroud that covered the air intake reducing the possibility of fire in the cabin.
	www.ironhorse129.com /Projects/Engines/NPC_21/no_21_backhead_detail.htm (1806 words)

	Patent 4402370: Valveless pneumatic hammer
		There is a chamber divider at the backhead end of the casing which co-operates with the piston for conducting fluid under pressure into alternate chambers, one at each piston end, for reciprocation of the piston.
		The backhead end of the chamber divider is adapted to co-operate with the inner end of the back-head assembly for the securing of the chamber divider between the screwed in backhead assembly, and the locating ring.
		In use, air under pressure is admitted to the casing 1 by the backhead assembly 2 and passes along the first fluid path into the first fluid chamber 23 where the pressure causes the piston 13 to move towards the backhead assembly 2 and position two.
	www.freepatentsonline.com /4402370.html (3064 words)

	Locomotive Backhead Detail
		THE BACKHEAD IS the part of a steam locomotive boiler extending into the cab.
		All steam locomotives need at least one gauge on the backhead to indicate boiler pressure.
		The injector usually, but not always, mounts on the fireman's side of the backhead.
	www.finescalerr.com /outdoor_railroader_articles/locomotive-backhead-detail.htm (1288 words)

	Shay Boiler Backhead - Fittings
		The machining of the various boiler related castings was started and some of the boiler fittings fabricated while waiting for the boiler to arrive.
		The fittings for the backhead are the water gauge, the firebox door and the throttle lever.
		The door will be attached to the backhead with screws in the four corners.
	www.nelsonslocomotive.com /Shay/Boiler/BoilerBackhead/BoilerBackhead.htm (1199 words)

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