Abstract
<i>Constructional Data for Small Telescope Objectives</i> . Calculated at the National Physical Laboratory. By T. Smith and R. W. Cheshire. 4to. Pp. 32. <i>Additional data for the construction of small telescopes objectives</i> . By the same authors. Prepared at the request of the Director General of Munitions Supplies. 4to. Pp. 82. London, Harrison and Sons, 1915 and 1916. Price, 2s.
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