. Deep borehole surveys and problems. Boring. PENDULUM METHODS 173 device. The rewind mechanism is a spool on a shaft carrying a blank record strip C. The ends of this shaft are fixed in horizontal aligning open- ings at one side edge of the plate and bracket. The worm gear D fixed on a shaft has one side against the plate and its opposite side face in a vertical plane with the inner face of the flange of the spool. The rewind spool is secured on the shaft between the worm gear D and the bracket and has side flanges. About midway between the rewind spool and the upper inturned arm, and at the
. Deep borehole surveys and problems. Boring. PENDULUM METHODS 173 device. The rewind mechanism is a spool on a shaft carrying a blank record strip C. The ends of this shaft are fixed in horizontal aligning open- ings at one side edge of the plate and bracket. The worm gear D fixed on a shaft has one side against the plate and its opposite side face in a vertical plane with the inner face of the flange of the spool. The rewind spool is secured on the shaft between the worm gear D and the bracket and has side flanges. About midway between the rewind spool and the upper inturned arm, and at the side edges of the plate, is a pair of idler rollers E mounted on pins fixed in the plate and extending inward and lying parallel with the rewind spool shaft. Over these the record strip passes from the spool (Fig. 112) presenting a flat surface for the inking device. The part of the strip down on the other side winds on to the rewind spool. The spool is driven by a spring motor F with a worm screw engaging in the worm gear in the space between the rewind spool and idler rollers. This revolves the spool clockwise, thus rewinding the strip, and its speed may be controlled. A pear-shaped pendulum attached by a string to an eyelet screw in the upper upturned arm of the frame lies centrally between the idler rollers and in vertical line with the â 'Plumb Bob Jo'ini allowing movemeiri- in one plane only â Seqmeni fastened fo. Degrees 307010 0 I5|5. Feet 120 240 360 480 600 720 840 960 1080 1200. 1320 1440 1560 1680 1800 1920 2040 2160 2280 2400 2520 2540 2760 2880 3000 3120 ,-5olid Cylindrical Weight aciing as Plumb Bob Pulling' Out â Pen Fig. 113. Fig. 113.âSketch showing method of transferring plumb-bob motion to the pen. Fig. 114.âA record with Kinley's apparatus. Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the
Size: 1606px × 1556px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionb, bookpublishernewyorkmcgrawhill
