Two aneroid barometer-altimeters (a & b) labeled: “Keuffel & Esser Co. N.Y. MADE IN ENGLAND. Improved Surveying Aneroid Compensated” Black oxidized finish on the case. Altitude graduation up to 12,000 feet. Leather carrying cases contain comparative pressure test sheet dated 1903 and issued by Keuf…
Two aneroid barometer-altimeters (a & b) labeled: “Keuffel & Esser Co. N.Y. MADE IN ENGLAND. Improved Surveying Aneroid Compensated” Black oxidized finish on the case. Altitude graduation up to 12,000 feet. Leather carrying cases contain comparative pressure test sheet dated 1903 and issued by Keuffel & Esser.