Evening Republican, Volume 16, Number 304, Rensselaer, Jasper County, 23 December 1912 — Smoke Is Less Dense Now. [ARTICLE]

Smoke Is Less Dense Now.

The average locomotive in Chicago at the present time Is making smoke the density of which is 14.92 per cent. This shows a decided improvement over the conditions recorded by the city smoke commission three years ago, when the average density wass reported at 23.3 per cent. The percentage gives the ratio of actual performance to worst possible performance; that is, if a locomotive emitted dense black Imoke all the time this record would be reported at 100 per cent If It gave out no smoke at all the percentage would be zero. The figures give.the results of many observations covering the entire city.