Terrestrial Physics in the United States 1

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    IN the first of the publications described in the footnote we have an investigation of the figure of the earth as determined by operations in the United States. The deflection of the vertical at each station, due to all known topography within 4126 kilometres of the station, has been computed. Least-square solutions, based on all the observations, were made (i) on the supposition that the earth is rigid; (2) solutions on the hypothesis of isostacy corresponding to three different assumed depths at which the isostacy is supposed complete; (3) a similar solution on the usual hypothesis, that there is no relation between the observed deflection and the topography.

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