. Deep borehole surveys and problems. Boring. PHOTOGRAPHIC METHODS 189 lenses can also be set here. On the upper surface of the level is a mark a a (Fig. 129) representing the abscissa. The Fig. 129. axis on which the direction of the throw is taken two convex lenses g and h from which the latter is screened throw the image of the level with the con- centric rings, the abscissa axis, and the upper needle ns (Fig. 129) on to a sensitive paper strip i (Fig. 128) working on rolls Ri and jB2 and shafts r, r. This is the headpiece with registering device shown in Fig. 128. Below the frame (not visi
. Deep borehole surveys and problems. Boring. PHOTOGRAPHIC METHODS 189 lenses can also be set here. On the upper surface of the level is a mark a a (Fig. 129) representing the abscissa. The Fig. 129. axis on which the direction of the throw is taken two convex lenses g and h from which the latter is screened throw the image of the level with the con- centric rings, the abscissa axis, and the upper needle ns (Fig. 129) on to a sensitive paper strip i (Fig. 128) working on rolls Ri and jB2 and shafts r, r. This is the headpiece with registering device shown in Fig. 128. Below the frame (not visible in Fig. 128) is a central lug for stick- ing in the casing. There are connec- tion screws for the level and the whole frame, for connection and screwing in the frame to the cylin- drical casing. The Registering Apparatus.—This is shown in Fig. 130 on a greater scale than in Fig. 128. A long strip of paper very sensitive to light winds from a roll Ri over two guide roll shafts r in the image plane of the level and lens system. From here it runs on over the fixed drive roll R2. There is a solenoid e above the rolls provided with a clutch n. 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 original Haddock, M. H. (Marshall Henry). New York, McGraw-Hill
Size: 2782px × 899px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionb, bookpublishernewyorkmcgrawhill
