Improvements introduced in the appliances to measure the deviation of the pollution holes (Machine-translation by Google Translate, not legally binding)

摘要

Perfections introduced into the apparatus for measuring the deviation of the boreholes, which have an oscillating pendulum in relation to the body of the apparatus, to allow the measurement of the deviation of the axis of the apparatus with respect to the vertical, characterized by the fact that the the axis of this pendulum is subjected to an undulating or zig-zag movement of very small amplitude, so that the coefficient of static friction of the pendulum on this axis is replaced by a coefficient of dynamic friction. (Machine-translation by Google Translate, not legally binding)