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Fig. No. 6.
Five-inch Trotjghton and Simms Transit Theodolite (Vertical Arc divided to -20 seconds), with chaining-scale attached. A. Steel scale divided to O'OOl of a link, attached by springs, and sliding to adjust to any tenth of a link on tin- 'mass scale. B. Brass scale divided to (J'u2 of a link.
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