# The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skillful Practice of this Art

E. Duyckinck, 1821 - 544 СЕКъДЕР

### тИ КщМЕ ОИ ВЯчСТЕР -сЩМТАНГ ЙЯИТИЙчР

дЕМ ЕМТОПъСАЛЕ ЙЯИТИЙщР СТИР СУМчХЕИР ТОПОХЕСъЕР.

### пЕЯИЕВЭЛЕМА

 Elements of Geo 43 rentor 163
 Instruments 180 Of distances 206

### дГЛОЖИКч АПОСПэСЛАТА

сЕКъДА 246 - ... that triangles on the same base and between the same parallels are equal...
сЕКъДА 58 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
сЕКъДА 231 - RULE. From half the sum of the three sides subtract each side severally.
сЕКъДА 45 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c.
сЕКъДА 14 - Then multiply the second and third terms together, and divide the product by the first term: the quotient will be the fourth term, or answer.
сЕКъДА 91 - ... scale. Given the length of the sine, tangent, or secant of any degrees, to find the length of the radius to that sine, tangent, or secant.
сЕКъДА 35 - DIVISION BY LOGARITHMS. RULE. From the logarithm of the dividend subtract the logarithm of the divisor, and the number answering to the remainder will be the quotient required.
сЕКъДА 30 - Then, because the sum of the logarithms of numbers, gives the logarithm of their product ; and the difference of the logarithms, gives the logarithm of the quotient of the numbers ; from the above two logarithms, and the logarithm of 10, which is 1, we may obtain a great many logarithms, as in the following examples : EXAMPLE 3.
сЕКъДА 211 - At 170 feet distance from the bottom of a tower, the angle of its elevation was found to be 52╟ 30' : required the altitude of the tower ? Ans.