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Parallel rule

Parallel rule

1876
Field's parallel rule

Field's parallel rule

1876
Parallel rule

Parallel rule

1876
Ivory parallel rule, six inch

Ivory parallel rule, six inch

Boswell's parallel rule

Boswell's parallel rule

1805-1830
Trigonometer serving as protractor and parallel rule

Trigonometer serving as protractor and parallel rule

1902-1920
Thirteen-arm parallel rule

Thirteen-arm parallel rule

1840-1860
Mechanical parallel rule, brass, in pine case

Mechanical parallel rule, brass, in pine case

Parallel rule and protractor

Parallel rule and protractor

Parallel rule

Parallel rule

1731-1770
Ivory parallel rule, from set of drawing instruments

Ivory parallel rule, from set of drawing instruments

1839-1900
Parallel rule in bakelite signed `Lund's Rule

Parallel rule in bakelite signed `Lund's Rule

1922-1927
Parallel Rule

Parallel Rule

Parallel rule, wood, single parallelogram type

Parallel rule, wood, single parallelogram type

Sliding parallel rule:- 3 foot

Sliding parallel rule:- 3 foot

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

Parallel rule

1876
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

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
Sliding parallel rule:- 3 foot, by William Cary, London, 3" wide when closed, connected by 4 bars, 5 1/8" between centres, mahogany box 3' 1" x 1 1/8" x 3 3/4", painted "Admiralty H.O.32"

Sliding parallel rule:- 3 foot