Geology Reference
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Figure 4.42 Pneumatic piezometer being used to take measurements of rapidly changing water
pressures during pile driving. Only small volume changes are necessary to measure pressure changes,
so readings could be taken every ten seconds or so. Water pressures measured went off scale at about
three times overburden pressure (Hencher & Mallard, 1989), Drax Power Station, Yorkshire, UK.
Figure 4.43
Extensometer with
claxon and
flashing
lights used to warn
workers at
Aznalcollar mine,
Spain, of danger
from moving slope.
 
 
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