She tries hardness
17th January 1947, Page 41
17th January 1947
Page 41
Page 41, 17th January 1947
— She tries hardness
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make a first-class tyre, rubber mixes of
different hardnesses must be used for tread, side walls, cushion, bead and casing. Each one must be just hard enough, but not too hard. Henley's test hard
ness with this instrument. The penetration of its steel sphere measures exactly the resistance of rubber under a given load.
Another example of the meticulous care in manufacture which is the secret of Henley's rapidly rising reputation for reliability.