| 31. | "Karagandoceras " has an involute, lenticular shell, with an acute ventral margin.
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| 32. | The "'base cylinder "'corresponds to the involute tooth surfaces are developed.
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| 33. | A few genera are more involute, with successive whorls partially embracing the flanks of the previous.
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| 34. | The left-handed involute of an all-fifths tuning is an all-fourths tuning.
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| 35. | For oil cooling the engine has an involute heat exchanger or a shell and tube heat exchanger.
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| 36. | "' Spur gear teeth "'are manufactured by either involute profile or cycloidal profile.
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| 37. | The shell of " Albanites " is more or less involute, smooth or faintly ribbed.
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| 38. | "Anapachydiscus " has a rather involute shell with a broad to moderately compressed whorl section.
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| 39. | The same involute gear may be used under conditions that change its operating pitch diameter and pressure angle.
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| 40. | Shells are variable in form, both ribbed, evolute forms and smooth, involute forms are included.
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