PHYSICS AND THE INTERNAL COMBUSTION ENGINE 29

   

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lull-Ill
Inn-Ill-
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III-lull.-

IIIIIIEEEI
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0-1 0-2 0-3 0-4 0.5 0-6 0-7 0-8 0-9
DEPTHOF‘ CASE‘ IN MM.

 

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s:
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I.
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II
II
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8‘68

5mm: SCLERESCOPE HARDNESS NUMBERS.
L9

Fig. 22.

Curve shewing hardness of Nitralloy Steel, oil treated and reheated
to give 64 tons tensile. Nitrated for 90 hours.