GB214919A - An improved apparatus for calculating percentages - Google Patents

An improved apparatus for calculating percentages

Info

Publication number
GB214919A
GB214919A GB2780123A GB2780123A GB214919A GB 214919 A GB214919 A GB 214919A GB 2780123 A GB2780123 A GB 2780123A GB 2780123 A GB2780123 A GB 2780123A GB 214919 A GB214919 A GB 214919A
Authority
GB
United Kingdom
Prior art keywords
percentages
improved apparatus
scales
calculating percentages
reading
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2780123A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WILLIAM RONALD FOUNTAINE SANGE
Original Assignee
WILLIAM RONALD FOUNTAINE SANGE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by WILLIAM RONALD FOUNTAINE SANGE filed Critical WILLIAM RONALD FOUNTAINE SANGE
Priority to GB2780123A priority Critical patent/GB214919A/en
Publication of GB214919A publication Critical patent/GB214919A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G1/00—Hand manipulated computing devices
    • G06G1/02—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)

Abstract

214,919. Carr, R. S., and Sanger, W. R. F. Nov. 5, 1923. Proportional calculators for determining percentages. Two scales or sets of scales b, c graduated in percentages and money respectively are arranged at an angle on a base a. Slidable along scale b is a cursor d carrying by means of a stiff pivot e a transparent arm f provided with a reading line f<1>. In the form shown, the horizontal scale is in three parts, namely, b<1> and b<2> reading from the centre and b<3> from the right.
GB2780123A 1923-11-05 1923-11-05 An improved apparatus for calculating percentages Expired GB214919A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2780123A GB214919A (en) 1923-11-05 1923-11-05 An improved apparatus for calculating percentages

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2780123A GB214919A (en) 1923-11-05 1923-11-05 An improved apparatus for calculating percentages

Publications (1)

Publication Number Publication Date
GB214919A true GB214919A (en) 1924-05-01

Family

ID=10265518

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2780123A Expired GB214919A (en) 1923-11-05 1923-11-05 An improved apparatus for calculating percentages

Country Status (1)

Country Link
GB (1) GB214919A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2846143A (en) * 1954-12-30 1958-08-05 Standard Oil Co Mechanical calibration chart

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2846143A (en) * 1954-12-30 1958-08-05 Standard Oil Co Mechanical calibration chart

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