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may be folved by (almost) any of those Canons
or Tables: was the occafion of the omiffion of
such Tables here at present. But chiefly, be-
cause there is intended (in fome short time) to
be Printed,) A CANON of Artificial SINES and
TANGENTS, both Seragenary and Centeci-
mal; differing from any yet Extant; it supply-

ing both ways of Numeration at one view, and

yet in the fame Room: And to this CANON fhall

be Added Ten CHILIADS of LOGARITHMS Com-

modiously Contracted; and the Use thereof in

Logarithmical Arithmetick.

Thus having given the Reader a General Ac-

count in this Preface, I refer him to a more Par-

ticular in the following Contents, and fo leave
him to the Practice of them: In which I wish him

good fuceefs; and till he hears farther from

me, bid him Farewell.

WILL. LEYBOURN.

ERRA

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Figures in the Margins Omitted, or Mifplaced.

Page 7.Against Probl.I. put Fig.VIII. and against Prob.II. put Fig.IX. in the Margin..
Page 9. Against Probl. V. put Fig. XIII. in the Margin.

Page 20. For Fig. XXXIV. put Fig. XXXVII. in the Margin.

Page 50. For Fig. VI. put Fig. XII. in the Margin.

Page 89, 90. 91. Fig. XXXI, in the Margin, must be Fig. XXXII.

Page 274. Fig. LIII. in the Margin, is omitted

Page 285, and 286. for Fig. LIX. read Fig. LVIII. in the Margin.

Page 53. The three laft Lines are thus to be read:

BA.C

The Triangle BD Chath
CDE

One Right Angle, and Two Acnte.
Two Obtufe, and One Right.
One Obtufe, and Two Acute..

CON-

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