. The trackman's helper, a handbook for track foremen, supervisors and engineers . es. Younext move the cord 30 feet ahead in the direction inwhich you wish to line, stopping at B with the endyou had first at A, and holding the end of the cordwhich was at C in your hand until its center is directlyopposite and distant just four inches from the trackcenter, at C. You may then set track center D at theend of the cord which you hold m your hand, ihisprocess may be carried on until you have set trackcenters for the whole curve. , . .r, ,,,i,^ip After you have set the track centers for the wholecur
. The trackman's helper, a handbook for track foremen, supervisors and engineers . es. Younext move the cord 30 feet ahead in the direction inwhich you wish to line, stopping at B with the endyou had first at A, and holding the end of the cordwhich was at C in your hand until its center is directlyopposite and distant just four inches from the trackcenter, at C. You may then set track center D at theend of the cord which you hold m your hand, ihisprocess may be carried on until you have set trackcenters for the whole curve. , . .r, ,,,i,^ip After you have set the track centers for the wholecurve, procure a gage which is square and true andmark on the gage, with some sharp instrument, the 238 LINING CURVES 239 correct center between track rails or middle of thegage. Place this gage on the track between the railsand over the track center where you wish to begin lin-ing the rails to place. Then have your men move thetrack with their lining bars until the center, as markedon the gage, comes directly over the track centerpoint on the stakes. Move the track in this manner. Fig. 48. The Letters A, B, C, to G are Track Centers ofa Curve 30 Feet Apart; A C is a 60-Foot Line with whichto Ascertain the Middle Ordinate; B M Shows Wherethe Measurements Should Be Taken to Find the MiddleOrdinate. at every point where you have set a center stake, andthen go back over it again, taking out any kinks orother defects left in the line, and you will have asplendid and a true curved line on your track. Care should be taken not to make any mistakes inmeasuring the middle ordinates, or in setting the trackcenters. It will pay to take your time and do the jobwell, because if properly done (like well surfaced 240 THE TRACKMANS HELPER track) it will need to be retouched only in spots after-wards. By commencing at a rail joint, this method of lininga curve may also be applied to the gage side of therails, and any defects in the track line can be takenout by moving the rails to place as you go,
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