. General instructions for the field work of .. . nnected with a trip-ping rod (Fig. 18, No. 19, and Fig. 19, No. 5),which is supported onrocker arms about 2inches above the metalscale. The pencil armis jointed and providedwith a hook whichpasses under the trip-ping rod. On the even hour the striking mechanism of the clockmoves the lever outside, which in turn rocks the tripping rod. Thelatter engages the pencil hook and pulls the pencil arm, causing thepencil to make a short stroke parallel to th-e edges of the paper. 378. The float is a copper cylinder, 8^ inches in diameter, andweighted so
. General instructions for the field work of .. . nnected with a trip-ping rod (Fig. 18, No. 19, and Fig. 19, No. 5),which is supported onrocker arms about 2inches above the metalscale. The pencil armis jointed and providedwith a hook whichpasses under the trip-ping rod. On the even hour the striking mechanism of the clockmoves the lever outside, which in turn rocks the tripping rod. Thelatter engages the pencil hook and pulls the pencil arm, causing thepencil to make a short stroke parallel to th-e edges of the paper. 378. The float is a copper cylinder, 8^ inches in diameter, andweighted so as to float with about one-third of its height above thesurface. It is connected with the float pulley by means of a softphosphor bronze wire. No. 23, American wire gauge. The floatmoves vertically with the tide in a float box. The float box must ■ be vertical and well braced; it should be long enough to amply coverthe range of tide, and should be 2-inch planks, and be 10inches clear and dressed inside. The openings should be small, so. Fig. 20. 88 COAST AND GEODETIC SURVEY.
Size: 1944px × 1285px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookidcu3192, booksubjectgeodesy
