Practical Notes On Hydrographic & Mining Surveys ..
Practical Notes On Hydrographic & Mining Surveys ..
Hearding, William Hellins
The book Practical Notes On Hydrographic & Mining Surveys .. was written by author Hearding, William Hellins Here you can read free online of Practical Notes On Hydrographic & Mining Surveys .. book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Practical Notes On Hydrographic & Mining Surveys .. a good or bad book?
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Soundings were taken over the northeast portion of the work upon lines gov- erned by flag ranges which were established upon the piers at dis- tances of fifty feet from each other, in the same manner as before described. The ranges of buoys with each other were noted as they occurred upon the lines of sounding run when making the described survey ; and it is a matter of the first importance, that such buoy and station ranges be recorded whenever they are observed to occur ; for the rate of spee...d at which the boat is pro- pelled may be imperceptibly changed during the process of soun d- ing a line, through the agency of light winds or currents, and a line produced on the range of two objects which are included in a sur- vey, a,nd carefully platted upon a map of the same, is practically equivalent to a reading upon an instrument, and the point where such a produced line intersects with a line of soundings will "cut oft'" or divide the line into sections, so that the spaces between soundings can be laid off* more correctly upon each section of the line.
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