Parallel rule, 6-inch, ivory and electrum, ordinary pattern, (single parallelogram) Parallel rule 1876
Naval parallel rule, c. 1885, by John Bliss & Co., patented (No.224,962) in the USA by Charles D. Sigsbee in 1880 Naval parallel rule 1882-1887
Ivory plotting scale opens to rolling parallel rule and contains dividers and combined pen and pencil, engraved "From John Francis Erskine of Mar Esquire, to Robert Bald Esquire 1800", in case Ivory plotting scale opens to rolling parallel rule and contains dividers and combined pen and pencil
Protracting parallel rule by W. & S. Jones, with two arms divided; engraved "W. & S. Jones no. 30 Holborn, London" Protracting parallel rule and components 1800-1860
Combined protractor and parallel rule for navigational use, designed by H. Douglas and made by the London Name Plate Manufacturing. Co. Ltd., 35 Victoria Street, London S.W.1, 1944-1970 Combined navigational protractor and parallel rule, 1944-1970 1944-1970
Parallel Rule, Japanese, signed `T.Tamaya. Tokyo', with an engraved anchor above Japanese characters(3), steel, 21 inches overall, with one arm divided every degree, in a fitted wooden box, the lid marked with the anchor and Japanese characters Parallel Rule