This is an Engineer's Mountain and Mining Transit, Model 5076. New, it cost $220. The Solar Attachment, Model 5090, based on the design patented by G. N. Saegmuller in 1881, cost an additional $50. The inscription on the compass dial reads “KEUFFEL & ESSER CO. / NEW YORK.” The 18373 serial number corresponds with a date of about 1908. By 1913, Keuffel & Esser had changed the design of this transit in several small ways.
Ref: Keuffel & Esser, Catalogue of Drawing Materials, Surveying Instruments (New York, 1906), pp. 30-31 and 372.
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