Opening the text

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

General

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

Name: 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
Author: Chaucer, Geoffrey

Chaucer, Geoffrey

English poetry -- Middle English, 1100-1500

An-other maner of werking upon the same syde. Loke upon which
  poynt thy rewle falleth whan thou seest the top of the tour thorow two
  litil holes; and mete than the space fro thy foot to the baas of the
  tour; and right as the nombre of thy poynt hath him-self to 12, right
  so the mesure be-tween thee and the tour hath him-self to the heighte   5
  of the same tour. Ensample: I sette caas thy rewle falle upon 8;
  than is 8 two-thrid partyes of 12; so the space is the two-thrid partyes
  of the tour.

  42_a_. UMBRA VERSA.

  To knowe the heyghth by thy poyntes of _umbra versa_. Yif thy
  rewle falle upon 3, whan thou seest the top of the tour, set a prikke
  there-as thy foot stont; and go ner til thou mayst see the same top at
  the poynt of 4, and sette ther another lyk prikke. Than mete how
  many foot ben be-tween the two prikkes, and adde the lengthe up to      5
  thyn eye ther-to; and that shal be the heyght of the tour. And note,
  that 3 is [the] fourthe party of 12, and 4 is the thridde party of 12.
  Now passeth 4 the nombre of 3 be the distaunce of 1; therfore the
  same space, with thyn heyght to thyn eye, is the heyght of the tour.
  And yif it so be that ther be 2 or 3 distaunce in the nombres, so
      shulde                                                             10
  the mesures be-tween the prikkes be twyes or thryes the heyghte of
  the tour.

  43_a_. AD COGNOSCENDUM ALTITUDINEM ALICUIUS REI PER UMBRAM RECTAM.

  To knowe the heyghte of thinges, yif thou mayst nat come to the
  bas of a thing. Sette thy rewle upon what thou wilt, so that thou may
  see the top of the thing thorw the two holes, and make a marke ther
  thy foot standeth; and go neer or forther, til thou mayst see thorw
  another poynt, and marke ther a-nother marke. And loke than what        5
  is the differense be-twen the two poyntes in the scale; and right as
  that difference hath him to 12, right so the space be-tween thee and
  the two markes hath him to the heyghte of the thing. Ensample: I
  set caas thou seest it thorw a poynt of 4; after, at the poynt of 3.
  Now passeth the nombre of 4 the nombre of 3 be the difference of 1;    10
  and right as this difference 1 hath him-self to 12, right so the mesure
  be-tween the two markes hath him to the heyghte of the thing, putting
  to the heyghte of thy-self to thyn eye; and thus mayst thou werke
  fro 1 to 12.

  42_b_. PER UMBRAM VERSAM.

Public-domain text, read in full here on John Shaqi.

Opening the text

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

General

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

Chaucer, Geoffrey

English poetry -- Middle English, 1100-1500

An-other maner of werking upon the same syde. Loke upon which
  poynt thy rewle falleth whan thou seest the top of the tour thorow two
  litil holes; and mete than the space fro thy foot to the baas of the
  tour; and right as the nombre of thy poynt hath him-self to 12, right
  so the mesure be-tween thee and the tour hath him-self to the heighte   5
  of the same tour. Ensample: I sette caas thy rewle falle upon 8;
  than is 8 two-thrid partyes of 12; so the space is the two-thrid partyes
  of the tour.

  42_a_. UMBRA VERSA.

  To knowe the heyghth by thy poyntes of _umbra versa_. Yif thy
  rewle falle upon 3, whan thou seest the top of the tour, set a prikke
  there-as thy foot stont; and go ner til thou mayst see the same top at
  the poynt of 4, and sette ther another lyk prikke. Than mete how
  many foot ben be-tween the two prikkes, and adde the lengthe up to      5
  thyn eye ther-to; and that shal be the heyght of the tour. And note,
  that 3 is [the] fourthe party of 12, and 4 is the thridde party of 12.
  Now passeth 4 the nombre of 3 be the distaunce of 1; therfore the
  same space, with thyn heyght to thyn eye, is the heyght of the tour.
  And yif it so be that ther be 2 or 3 distaunce in the nombres, so
      shulde                                                             10
  the mesures be-tween the prikkes be twyes or thryes the heyghte of
  the tour.

  43_a_. AD COGNOSCENDUM ALTITUDINEM ALICUIUS REI PER UMBRAM RECTAM.

  To knowe the heyghte of thinges, yif thou mayst nat come to the
  bas of a thing. Sette thy rewle upon what thou wilt, so that thou may
  see the top of the thing thorw the two holes, and make a marke ther
  thy foot standeth; and go neer or forther, til thou mayst see thorw
  another poynt, and marke ther a-nother marke. And loke than what        5
  is the differense be-twen the two poyntes in the scale; and right as
  that difference hath him to 12, right so the space be-tween thee and
  the two markes hath him to the heyghte of the thing. Ensample: I
  set caas thou seest it thorw a poynt of 4; after, at the poynt of 3.
  Now passeth the nombre of 4 the nombre of 3 be the difference of 1;    10
  and right as this difference 1 hath him-self to 12, right so the mesure
  be-tween the two markes hath him to the heyghte of the thing, putting
  to the heyghte of thy-self to thyn eye; and thus mayst thou werke
  fro 1 to 12.

  42_b_. PER UMBRAM VERSAM.

Public-domain text, read in full here on John Shaqi.

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

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

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