A TABLE of the Sun's Declination.

Each being the first Year after Leap-Year.

July Auguft | Sept.

Octob. Nov.

Dec.

Days.

N.

N.

N.

S.

S.

S.

Days.

Each being the second Year after Leap-Year.

Each being the third Year after Leap-Year.

To reduce one MEASURE

to another.

PROB. I.

To reduce Irish to English Acres, and the contrary.

of be

Tis plain, that if any Parcel of Ground be measured by Chains of different Lengths, that the Figures conftructed from thefe different Meafures will be unequal, but like to each other; and therefore fuch Figures will be in a Duplicate Proportion to their homologous Sides, by Theo. 23. Sect. 1.

Let (in Plate 2. Fig. 6.) abcde be a Map of Ground that was measured by an Irish or Plantation Chain, and ABCDE be another of the fame Ground that was measured by an English or Statute Chain; if the Line ab in the first be 11 Irish Perches, the Line AB in the other will be 14 English ones; for it has been already fhewn in Page 135, that 11 Irib Perches are equal in Length to 14 English ones. Whence it is plain that.

1. If

1. If you would reduce Irish Acres to English ones, it will be

As the Square of 11, or 121,
Is to the Area in Irish Acres,
:: The Square of 14 or 196,
To the Area in English Acres.

2. And if you would reduce English Acres to Irish ones, it will be

121)7740824(63973(399. 3. 13.

Answer 339A. 3R. 13P. Statute Meafure.

EXAMPLE

196)8065134(41148(257.0. 28.

Answer 257A. OR. 28P. Plantation Measure.