The emission or escape of dense smoke within the City from any smoke stack, chimney or other part of any locomotive, stationary engine, steam roller, steam derrick, steam pile driver, steam shovel, tar kettle or other similar machine or contrivance or of any building or premises to which this chapter applies, except for a period of or periods aggregating ten minutes in any one hour during which the fire box is being cleaned out or a new fire being built therein, is deemed a nuisance.
(R.O. 1946, C. 30, Sec. 3.)