G06G1/02—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales
G06G1/10—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales characterised by the graduation
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Length-Measuring Instruments Using Mechanical Means
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XXVIII. A new and general method of finding simple and quickly-converging series; by which the proportion of the diameter of a circle to its circumference may easily be computed to a great number of places of figures
The Prehistoric Cultures of the Horn of Africa: an analysis of the Stone Age cultural and climatic succession in the Somalilands and eastern parts of Abyssinia. By JD Clark. 9¾× 7¼. Pp. xx+ 386+ pls. 52. Cambridge, at the University Press, 1954.£ 5. 5s.