Compressed air is delivered
through tapered column 1 conta
in in g float 2 and, in its upper
part, two contacts 3. The air
flows further to the measuring
head. At definite dimensions
of the workpieces being inspected,
float 2 closes contacts 3 of
the signalling circuit. The air
pressure is regulated by means
of th rottlin g device 4.
$4344$SmE,M$