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CAT NO: DIDACTICNLE-Export-310002
Auxiliary Apparatus.
Auxiliary Apparatus -
Penetration through most upper leathers would be very slow if they
were merely put into contact with water without flexing, and the rate of
penetration of most leathers may be greatly accelerated by increasing
the severity of the flexing (for example, by increasing the amplitude of
the crank motion on the test machine). Experience shows that if all
types of upper leather are flexed to the same extent when tested on the
machine, the water proofness of thick leathers in actual wear will be
under estimated, and that of thin leathers over estimated. For this
reason, the machine is so constructed that any one of four amplitudes
may be chosen for particular tests.
The Auxiliary Apparatus is used for deciding whether a particular
leather or group of leathers should be flexed with 5, 7.5, 10 or 15%
amplitude
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