新しい剃刀の切れ味試験機について

抄録

A sharpness tester for razor blades of a new type was devised and the mechanism of cutting hairs in shaving was discussed. By the new instrument, the pulling effect could be measured quantitatively and it was found that the pulling effect was an important factor in shaving. The load to cut a string was applied by means of water pressure, so that it could be increased continuously and shockless at a constant rate. The new instrument is capable of measuring the sharpness of a razor blade at any point and is very simple and rapid in operation.