Show For Smooth Railway Travel New York Times P H Dudley the civil engineer is operating In a field of invention which Is not invaded to any great extent by other persons of a scientific turn of mind Mr Dudleys specialty is n machine to register the undulations or unevenness of railway tracks By a delicate adjustment of mechanism between the wheels of a car which he uses specially for the purpose pur-pose the Jarring and jogging of the train on the rails are accurately transcribed tran-scribed on a roll of paper On aper fectly true railroad the mark on the paper would be a straight line byt in the test of a rough road the line transmitted to the paper is zigzag like a rail fence This invention Is used to test the need of repairs on railroads I a roadbeds not solid or level or If the rails are light and the ties imperfect im-perfect lines like a neglected hedge are transmitted to the roll of paper The illustrations which Mr Dudley gives gves of some of the old and very poor roads are amusing Another interesting feature fea-ture is that of showing the improvement improve-ment made within a few years on some of the leading lines of this state The better a road the less the wear and tear of wheels and cars and the safer to the traveling public The problem of smoothness engineers is b constant study among |