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Road Surface Texture Prints

Nature volume 145, page 40 (06 January 1940) | Download Citation



THAT surface texture is an important factor in determining the resistance of a road to skidding has long been recognized, and at the Road Research Station one of the studies which has received attention has been the development of a satisfactory method of recording this quality. The latest device is an adaptation of the method of offset printing, and it is also the simplest and the most revealing in that it readily lends itself to a study of the changes which occur during the life of the road carpet and of its progress towards failure. A few square inches of the road under examination are cleaned of dust and then carefully inked over either by an ordinary half-tone black printing ink diluted with paraffin or by a water letterpress ink. A clean rubber roller, of specified hardness, is then run over the inked area and the impression taken by the roller is transferred to a sheet of white paper.

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