THE ARTESIAN WATER SUPPLY OF EASTERN FLORIDA.

sluice or ditch of uniform width, its cross section may be estimated and its velocity taken. This method, however, is not very accurate. The following are methods which give fairly accurate: results with little trouble and in short time. All that is necessary for the purpose is that the water be discharged through a pipe of uniform diameter, a foot rule, still air, and care in taking measure-. ments.
"Two methods are proposed, one for pipes discharging vertically, which is particularly applicable before the well is permanently finished, and one for horizontal discharge, which is the most frequent way of finishing a well. For measuring a vertical flow we have extended a method which was first used by Mr. P. E.
lii i
8 3i7hes,
/ '07 <b 37.40 aln~e mnt
Fig. IO- Illustrating method of measuring the flow of an artesian
well from horizontal and vertical pipes. After Todd.
Manchester, C. B., of Chamberlain, who published a table adapted, to large wells, in the Chamberlain Register, December, 189$.
"The table below is adapted to wells of moderate size as well as to larger. In case a. well is found of other diameter than that given in the table its discharge may be obtained without much difficulty from the table by remembering that other ,things being equal the discharge varies as the square of the diameter of the pipe. If, for example, the pipe is one-half inch in diameter its discharge will be one-fourth of that of a pipe one inch in diameter, whose' stream reaches ;the same height, so also a pipe eight inches in diameter may be obtained by multiplying that of the four-inch pipe by four.
"In the first case the inside diameter of the pipe may be mea-. sured, then the distance from the end of the pipe to the highest

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