Folding clinometer rule with case, by D. Mauch, Cologne, Germany, 1855-1865 Folding Clinometer Rule, 1855-1865 1855-1865
Two clinometers, jointed-rule type, one by Thomas Jones, first half 19th century, ex Antartic Expedition 1901, the other unsigned Two Clinometer rule, British Antarctic Expedition, 1901 1816-1850
Boxwood and nickel silver folding rule clinometer with magnetic compass and spirit level and case, by Elliott Brothers, 56 Strand, London, England, 1856-1862. Folding rule clinometer with case, 1856-1862 1856-1862
Clinometer rule and compass with case, Glover's patent of 1839, by D. Mauch, late 19th century to early 20th century Clinometer rule & compass, 1885-1905 1885-1905