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PUBLIO LISBART 987745A

MR AND

L

District of New-York, a

BE IT REMEMBERED, that on the twenty-eighth day of March, in the thirty-fifth year of the Independence of the United States of America, Evert Duyckinek, of the said district, hath deposited in this office the title of a book, the right whereof he claims as proprietor, in the words following, to wit:

"The Theory and Practice of Surveying; containing all the Instructions requisite for the skilful practice of this Art. By Robert Gibson. Illustrated by Copper-Plates. The whole corrected, newly arranged, and greatly enlarged, with useful Selections, and a new set of accurate Mathematical Tables. By D. P. Adams, Teacher of the Mathematics."

In conformity to the act of the Congress of the United States, entitled "An act for the encouragement of learning, by securing the copies of maps, charts, and books to the authors and propietors of such copies, during the times therein mentioned." And also to an act, entitled" An act, supplementary to an act, entitled an act for the encouragement of learning, by securing the copies of maps, charts, and books to the authors and proprietors of such copies, during the times therein mentioned, and extending the benefits thereof to the arts of designing, engraving, and etching historical and other prints."

CHARLES CLINTON,
Clerk of the District of New-York

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of the Mathematical Characters used in this work.

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.

+ signifies plus, or addition.

minus, or subtraction. x or multiplication.

division.
proportion.
equality
square root.
cube root, &c.
diff. between two numbers when it is not

known which is the greater.

.

.

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Thus,

5 to 3, denotes that 3 is to be added to 5. 6 2, denotes that 2 is to be taken from 6. 7 x 3, or p. 3, denotes that 7 is to be multiplied by 3. 8 • 4, denotes that 8 is to be divided by 4. 2:3::4:6, shows that 2 is to 3 as 4 is to 6. 6 + 4 = 10, shows that the sum of 6 and 4 is equal to 10: ✓ 3, or 3, denotes the square root of the number 3. ✓ 5, or 5., denotes the cube root of the number 5. 72, denotes that the number 7 is to be squared. 83, denotes that the number 8 is to be cubed.

&c.

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