. Railway age . Rail Section Tracing Machine. not become worn, the author experimented with various surfaceson which to make the tracing, and finally adopted a strong smoothdrawing paper which he covered with a very thin layer of meltedwhite wax mixed with lamp-black. A black surface was obtainedwhich the needle-point easily and smoothly cut through, and thesection of the rail thus appeared as a thin white line on a blackground. This proved quite satisfactory, as It prevented any scratch-. Detail of Tracer. ing or tearing of ilie paper surface, and the section was afterwardseasily traced. Such
. Railway age . Rail Section Tracing Machine. not become worn, the author experimented with various surfaceson which to make the tracing, and finally adopted a strong smoothdrawing paper which he covered with a very thin layer of meltedwhite wax mixed with lamp-black. A black surface was obtainedwhich the needle-point easily and smoothly cut through, and thesection of the rail thus appeared as a thin white line on a blackground. This proved quite satisfactory, as It prevented any scratch-. Detail of Tracer. ing or tearing of ilie paper surface, and the section was afterwardseasily traced. Such an apparatus as this offers the only really satisfactorymethod that there is of obtaining a correct cross s>ection of a rail,and if this information Is obtained at regular intervals It will notonly provide the desired data as to the strength of the rail fromtime to time, but will also afford a reliable guide as to the positionand the rate of the wasting in progress, by means of which theexact time may be determined when its renewal will be necessary,provided the conditions of service remain comparatively the rate of deterioration may vary considerably on evtn a shortlength of railroad, it Is worth while logging the information obtainedin the form of a continuous record. May 22, 1908. THE RAILROAD GAZETTE. roi The Thames Tunnel. The old traffic tunnel under the , in l>ondon. was de-signed by Brunei in 182^, and took upwards of 17 years to build,including a
Size: 2169px × 1152px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookidrailwayage44, bookyear1870
