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Trigonometer serving as protractor and parallel rule

1902-1920

Parallel rule

1876

Ivory parallel rule, six inch

Parallel rule, wood, single parallelogram type

Parallel rule in bakelite signed `Lund's Rule

1922-1927

Parallel rule

1731-1770

Field's parallel rule

1876

Parallel rule

1876

Boswell's parallel rule

1805-1830

Parallel rule and protractor

Thirteen-arm parallel rule

1840-1860

Mechanical parallel rule, brass, in pine case

Sliding parallel rule:- 3 foot

Parallel rule, 6-inch, ivory and electrum, ordinary pattern, (single parallelogram)

Parallel rule

1876

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

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

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