20 different kinds of the pneumatic marteaux-piqueurs, which have made remarkable progress of their usages in our coal fields, are tested recently in our mining laboratory.
The type of the tester in Müller's spring-type machine which records the strength of blows and number of strokes of picks in unit time. To measure the air consumption of picks, we used Kent's 11/2″ gate air meter. From the above two measurements we calculated the indicated horse-powers and the efficiencies of them.
And also by setting the picks at reverse position, we could measure the kinds of them which may have very important co-relation to the physical condition of workers.
This paper contains chiefly the results of the six characteristic points of the picks which will turn out to the valuable gindance to the practical application of the marteaux-piqueurs.
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