Dust.

Progress, Volume III, Issue 9, 1 July 1908, Page 306

Dust.

Experiments show that the larger the area of resistance of a fast moving car, the greater the air displacement, or partial vacuum which seems to be created behind the car, and so it follows, more dust is raised. And in so far as a large folded buggy hood goes to increase this resistance, it must increase the dust raised. It all depends on whether the hood when folded back adds to the area of the car's resistance as seen from the front, or not.