Abstract
In this report, the effect of inclination of the measuring tube of the tester on the Shore hardness number was investigated. The experiment was carried out with three Shore scleroscopes of D-type and many specimens different in hardness or in material. It need scarcely be mentioned that the general requests for testing were satisfied in this experiment. Especially operating conditions of the tester were carefully maintained constant throughout this experiment without being effected by the speed of the operating handle and the force with which the specimen was pressed. As a result, the effect of inclination of the measuring tube on the hardness number was made clear. That is, on the whole, the behaviour of this effect is separated into three sections. Namely, 1st is a horizontal line section where the hardness number has no change, 2nd is a inclined line section where the hardness number dropes at constant rate, and 3rd is a horizontal linear section where the hardness numbers are scattered over a certain range. It is shown that the hardness of the specimen, and the structure of the tester, dimensions and finishing grade of its parts have some influence upon this effect. And, after all, it is represented that the effect of inclination of the measuring tube is so strong that it is necessary to attend to hold the measuring tube vertical in such cases as testing with the measuring tube hold by hand or by the swing arm holder.
