Fecha de publicación: 12/01/1914 Fuente: WIPO "pollen" 23,351. Pollen, A. H., and Isherwood, H. Oct. 12. Range-finders.- Ranges and bearings are plotted and the rates of change of these quantities determined in a machine in which a paper strip travels at a constant rate under range and bearing markers travelling transversely to the motion of the paper. The carriage 3 carrying the range plotter is similar to the bearing - carrier and moves parallel to it. The carriage is secured to and travels along a screw 4 to give a reading of the range by means of a pointer 51 reading against a bar 2, a pricker in a member 11 being depressed at the will of the operator to give a mark on the paper. The thousands on the scale are read through windows 9 in the bar carrying the scale, and means are provided for shifting the thousands so that the plot can represent any range desired. A transparent slip 55 can be set to a plot so that a radial line on it becomes a tangent when the rate of change of the quantity plotted is read from a scale 18.