A generall Rule.
In all proportions wrought by Sines and Logarithms, you must observe this for a generall rule, viz. to adde the second and third numbers together, and from the summe of them to substract the first number, so shall the remainder answer your question demand∣ed, as by the former work you may perceive, where the Logarithm of the side BA 2,602059 (which is the second term) is added to the sine of the angle CBA 9,698970, (which is the third term) and from the summe of them (namely from 12,301029) is substract∣ed 9,937531, the sine of the angle BCA, which is the first num∣ber, and there remaineth, 2,363498, which is the Logarithm of 231 almost, and that is the length of the side required in feet.