Note 3 — CONSERVATION THROUGH ENGINEERING[1]

It is the western and southern fields that are most affected by the seasonal demand. As a typical example, Illinois may be cited, with 18 per cent of the year's production in 25 per cent of the time, April, May, and June, in 1915, and 15 per cent in 1916. Retail dealers received 27 per cent of the coal from Illinois in the period from August, 1918, to February, 1919, compared with 4 per cent from the Pittsburgh, Pa., field.