History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 267
t years experience with the fire-alarm apparatus, show-ing in what hours of the day and night fires are most or leastlikely to occur. The diagram covers the twenty-four hours ofthe day, and is divided by the dotted lines into the forenoon andafternoon, and also into the portions between six oclock… … Thus it will be seen that the maximum of alarms occurs be-tween eight and nine P. M., the minimum at six oclock A. M.,and the medium at precisely six oclock P. M. The larger number of fires occur between six oclock P. M.and six oclock A. M.; in fact, the angles in the other twelvehours of the day…
Telegraph
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