Morgan, William Ray, b. 1898, Charles, Andrew Hoyle, Jr · leaf 46
30 The effective height giving the best range in number of blows requiredto produce failure was 3.3 cm. in our case. The point of contact cfthe hammer with the enamel was the surface of a 3/4 steel ball, thisgiving practically a single point contact. The number cf blows re-quired to cause failure…
Enamel and enameling · Theses
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