Archive image from page 86 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 CORE ORIENTATION 75 the cores on the surface. To the upper portion of the core box a screwed to the boring rods h is secured a plate holding a pipe c, which leaves a space between it and the walls of the core box for rinsing water. In the center of c are oscil- lating needles d and e supported on their respective gimbals or universal suspensions / and g. Gimbals g are weighted on one side by weight h, causing e to incline. Above d and below e are cork pistons
Archive image from page 86 of Deep borehole surveys and problems. Deep borehole surveys and problems deepboreholesurv00hadd Year: 1931 CORE ORIENTATION 75 the cores on the surface. To the upper portion of the core box a screwed to the boring rods h is secured a plate holding a pipe c, which leaves a space between it and the walls of the core box for rinsing water. In the center of c are oscil- lating needles d and e supported on their respective gimbals or universal suspensions / and g. Gimbals g are weighted on one side by weight h, causing e to incline. Above d and below e are cork pistons i moved by springs j toward the needle points of d and e. The cork disc i is held by rod k allowing d to oscillate freely and carries an arm lever / rotatable about the long axis of the apparatus, the lower end of this lever holding another arm m by means of rod c to actuate the lower cork plunger i. Under the top plunger i is a gunlock trigger-releasing device actuated by rod n operating springs j which press the cork pistons i against the points of pendulum needles d and e. Needle d is used for indicating the dip of the bore- hole and e for the lateral deviation due to the action of weight h. To facilitate this the cork discs i are faced with paper scales on which the needle points prick holes. As electric cables can not be introduced into the hole during boring, the positions of the indicating needles are fixed by a messenger weight dropped in releasing the above device from n. The movement relative to the meridian is taken with respect to a mark made on the core box. In core boring the needles are fixed before wrenching off the core; then the core is extracted and the core box arranged on the surface in such a manner that it is slightly inclined and a definite mark arranged on the meridian. The cork pistons i are withdrawn and the needles released, taking up a position in accordance with the inclination of the core box. After the needles come to rest pistons i are again rel
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Keywords: 1930, 1931, archive, book, bookauthor, bookdecade, bookpublisher, booksponsor, booksubject, bookyear, boring, boston_library_consortium_member_libraries, drawing, haddock_m_h_marshall_henry_, historical, history, illustration, image, new_york_mcgraw_hill, page, picture, print, reference, vintage, zimmermann_a_albrecht_b_1860
