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Author: Oughtred, William, 1575-1660.
Title: The circles of proportion and the horizontal instrument. The former shewing the maner how to work proportions both simple and compound: and the ready and easy resolving of quæstions both in arithmetic, geometrie, & astronomie: and is newly increased with an additament for navigation. All which rules may also be wrought with the penne by arithmetic, and the canon of triangles. The later teaching how to work most quæstions, which may be performed by the globe: and to delineat dialls upon any kind of plaine. Invented, and written in latine by W.O. Translated into English, and set out for the public benefit, by William Forster.
Print source: The circles of proportion and the horizontal instrument. The former shewing the maner how to work proportions both simple and compound: and the ready and easy resolving of quæstions both in arithmetic, geometrie, & astronomie: and is newly increased with an additament for navigation. All which rules may also be wrought with the penne by arithmetic, and the canon of triangles. The later teaching how to work most quæstions, which may be performed by the globe: and to delineat dialls upon any kind of plaine. Invented, and written in latine by W.O. Translated into English, and set out for the public benefit, by William Forster.
Oughtred, William, 1575-1660., Forster, William,, oughtred, William, 1575-1660.

London: Printed by Augustine Mathewes, and are to bee sold by Nic: Bourne at the Royall Exchange, 1633.
Notes:
W.O. = William Oughtred.
Another issue, with cancel letterpress title page, of STC 18899: The circle of proportion, and the horizontall instrument.
Translated by William Forster from the original Latin.
The "additament" also published separately as STC 18899c: An addition unto the use of the circles of proportion.
Reproduction of the original in the Bodleian Library.
Subject terms:
Mathematical instruments -- Early works to 1800.
Navigation -- Early works to 1800.
URL: http://name.umdl.umich.edu/A08582.0001.001
How to cite: For suggestions on citing this text, please see Citing the TCP on the Text Creation Partnership website.

Contents
THE FIRST PART OF THIS BOOKE, Shewing the vse of the First side of the Instrument, for the working of Pro∣portions both simple and compounded, and for the ready and easie resolving of que∣stions both in Arithmetique, Geometrie, and Astronomie, by Calcu∣lation.