Chaucer's Works, Volume 3 — The House of Fame; The Legend of Good Women; The Treatise on the Astrolabe; The Sources of the Canterbury Tales

by Geoffrey Chaucer

Tak the altitude of the tour by bothe holes, so that thy rewle ligge

even in a poynt. Ensample as thus: I see him thorw at the

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poynt of 4; than mete I the space be-tween me and the tour, and I

finde it 20 feet; than be-holde I how 4 is to 12, right so is the space

betwixe thee and the tour to the altitude of the tour. For 4 is the

thridde part of 12, so is the space be-tween thee and the tour the

thridde part of the altitude of the tour; than thryes 20 feet is the

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heyghte of the tour, with adding of thyn owne persone to thyn