. Railway mechanical engineer . ow slit was reflected back to ascreen. One mirror was fastened rigidly to the outer sheetand traveled with it and remained parallel to it at all main body of the apparatus including all lenses andadjustments was also attached to this same sheet. The secondmirror was suspended on the main body of the apparatus butwas so connected to the inner sheet that, if any motion tookplace between the two sheets, the mirror would be would cause a separation of the two beams of light onthe screen and the amount of separation was a measure oftlie relativ
. Railway mechanical engineer . ow slit was reflected back to ascreen. One mirror was fastened rigidly to the outer sheetand traveled with it and remained parallel to it at all main body of the apparatus including all lenses andadjustments was also attached to this same sheet. The secondmirror was suspended on the main body of the apparatus butwas so connected to the inner sheet that, if any motion tookplace between the two sheets, the mirror would be would cause a separation of the two beams of light onthe screen and the amount of separation was a measure oftlie relative movement of the sheets. The calculation of themotion was simply dependent upon the distance at whichthe screen was set from the mirrors. The first setting was such that separation of 1/16 in. in-dicated a relative movement of 1/20,000 in. between the twoplates. This was found to give finer measurements thanwere needed and the whole of the work, hereinafter detailed,was done with the screen so set that each 1/16 in. separation. The Original Apparatus of the beams of light indicated a relative movement of 1/6400in. between the plates. The first boilers subjected to investigation were of theradial stayed type as illustrated in the accompanying en-gravings. There were two of them that were identical inconstruction except that one was fitted with a complete in-stallation of the ordinary rigid staybolts and the other witha complete installation of the Tate flexible staybolts. The firebox dimensions were: Length at bottom 8 ft. 3 in. Length at top 8 ft. 8/5 in. Width at bottom .. 5 ft. 2 in. Width at top 4 ft. 8 in. The general arrangement of the apparatus is shown inthe illustrations. Each firebox was fitted with four watertubes for carrying a brick arch which was located as shown. 701 RAILWAY MECHANICAL ENGINEER Vol. yj, No. 12 New fireboxes had been placed in each of the boilers imme-diately prior to the tests so that all of the sheets affected werefresh and clean. SCOPE of inves
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
