Abstract
( Read 4 th March , 1909. Manuscript received 30 th December , 1909.) The apparatus is for the purpose of determining the inclination and the direction of the inclination of bore holes, which when carried to a great depth are liable to run away from the vertical direction. It furnishes also means whereby the dip or inclination of the strata passed through by the bore holes and the direction of the same can be ascertained. The apparatus consists of a hollow pendulum, in the form of a hollow cone of any light and suitable material, preferably non-magnetic. Aluminium is well suited for the purpose. The full angle of the pendulum cone is about 100 degrees. A pivot pin secured to a circular base plate supports the pendulum from the apex end of the hollow of the pendulum in such manner that the base plate and pivot pin can be tilted at a considerable angle and still allow the pendulum to hang truly vertical. An agate bearing is inserted in the apex of the hollow of the pendulum or cone. A magnet is secured to the upper end or apex of the pendulum by a screw projecting from the apex of the same and passing through a hole in the centre of the magnet, and a nut or cap screwing on to the same. The nut is formed with a hemispherical cap, the centre of which, when the nut is screwed down on to the magnet, coincides with the point of support for the cone, …
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