Compressed Air Work And Diving 1909
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KIN G EDWARD VII. BRIDGE.
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lid was fastened clown by four screws, and also two safety
bolts 11 in. wicle, which were strong- enou«'li to holcl
clown the lid against the pressure, should the door not
have been fastened clown by the screws. These bolts
were kept in position by two tongues fastened to the
piston rods of two pistons ; the bottoms of the cylinders
Fig. 12.—Bucket and Tipping Gear.
communicated with the bucket chamber. Consequently
when there was a + pressure in the bucket chamber it
was impossible to draw back the bolts and allow the lid
to be blown off by the air. If, 011 the other hand, the air
pressure had been admitted to the chamber before the
screws had been tightened, the bolts, which were kept