Copy 2

The description and use of ... Gunter's quadrant ... To which is added, the use of Nepiar's [sic] bones in multiplication, division, and extraction of roots ... / [William Leybourn].

  • William Leybourn
Date:
1731-1732
Catalogue details

Licence: Public Domain Mark

Credit: The description and use of ... Gunter's quadrant ... To which is added, the use of Nepiar's [sic] bones in multiplication, division, and extraction of roots ... / [William Leybourn]. Source: Wellcome Collection.

    154/166 (page 60)
    under every feveral Figure of this Square, write their Multiples found rightwards, even fuch as the Figures themfelves do fhew ; fo that every Multiple may end under its Ligure or Quotum : Then add together thefe Multiples crofs-wife, and take their Sum Jrom the Figures foregoing the fecond Point, and write the Remainder over them; but write the right Hand Quotum, before noted, under the fecond Point between the Lines, for the fecond Figure or Quotum of the Koot: And fo is performed the Operation of the fecond Point, which you muff re- peat through the feveral Points, even to thé laf. But in the PraGtice by this Rule, you may fometimes be at a ftand, wherefore to ths GENERAL RULE (that theré may be no Obftacle) I will add thefe two CAUTIONS, CAUTION If. But in all Operations and Points it muft be obferved, That if no Multiple (no not theleaft of all) found in the left Rods, and the Plate, can be fubjtraited from the foregoing Remains; then a Cy- pher [0] muff be put under that Point eg 11@