The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

[1930]. Cast-iron manhole and block; T-head bolts are generally used, but also eye-bolts, as in [No. 937].

[1931]. Wrought-iron plate lid, or cover for a tank.

[1932]. Wrought-iron dished cover, with hinged crossbar and T-screw used largely for gas retorts.

[1933]. Furnace door; hinged, with inside plate to protect the door from the heat.

[1934]. Manhole door with water seal, or packed recess to keep back gases, smell, &c.

[1935]. Screwed plug handhole.

[1936]. Wrought-iron boiler manhole cover, and block, a special manufacture.

[1937]. Type of sliding door; can be made airtight by planing the seatings.

Hinged doors are well-known. For hinging, see [Section 50]. For fastenings, see Locking Devices, [Section 49].

See also [Nos. 931], [937], [940], [962].