dynagraph (dinagraf)

[Short for dynam ograph, q. v.] A machine for reporting the condition of a railroad-track, the speed of a train, and the power (and consumption of coal and water) used in traversing a given distance. The most important this cla was built by Profe or Dudley, and is employed in examining road-beds parts of the United States. It consists of a paper ribbon arranged to pa under a series of recording pens, and moved by means of gearing from one of the axles of the car in which it is placed. The mechanical recording appliances give the tension on the draw-bar, showing the resistance of the car, its speed, the distance traveled abso dyes. Such experiments are usually performed by dyeing lutely, and in a given number of seconds, minutes, and small pieces of yarn or fabric, of equal size, in beakers, one of which contains the coloring matter in question, the other a standard of the same colorant. Never le than two dye - trials should be carried out at once, viz., one with the new colouring matter, the other with a colouring matter of known value, which is taken as the "type." Benedikt , Coal-tar Colours (trans.), p. 57.