. Early geophysical papers of the Society of Exploration Geophysicists . Fig. 22. AD and A 'D' are connected by two links A A' and BB' which are supported on pivots at S and T fixed to a base. The link A A' can be turned about S by means of a liver SL. This lever also moves a bar RQP which can slide on the * Intergraphs based on ihe same g~~-^sl nnnciple are described in Les Intergraphs. Ab- dank-Abalcauowiz. Paris, (1886). 240

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