Abstract
The subject of nomographic or alignment charts has received considerable attention during the last few years. Although its value as a time and labor saving device is so evident, still it has taken almost a generation since its inception by the French engineer and mathematician, M. D’Ocagne, before the American engineer has sought to profit by it. The world war brought our ordnance engineers in contact with the French engineers, and the former have learned how the latter apply the principles underlying the alignment chart to the graphical solution of some of their problems in ballistics and allied subjects. Today, some of our manufacturers are becoming interested in these charts, and the “Department of Industrial Cooperation and Research” at the Massachusetts Institute of Technology, which is in close contact with over two hundred of these firms, has received many requests for alignment chart solutions of various simple problems which have arisen in their shop work. These solutions, because of their simplicity, can be used by the workmen in the shop with considerable facility and little chance of error.
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