Illustrated catalogue and price-list of drawing and tracing papers, sun print papers and equipments, drawing instruments and materials, surveying instruments, accessories, etc. / Kolesch & Company. (1917)
Kolesch & Company · Kolesch & Company · leaf 273
t to zero on the com-mencement of an observation, thus obviating the necessity of taking areading of the dials before proceeding to make a fresh observation. Another improvement is the recent introduction of ball-bearings tothe central shaft by which the friction is reduced to a minimum and… … This instrument is constructed and used for the measurement of rate or flow ofsmall rivers and streams, also for the flow of tides. For this purpose the meter should be placed in the stream, as per directions sup-plied, and allowed to run for a given time. The rate of the stream per unit time…
Drawing instruments · Surveying -- Instruments
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