This tank wagon carried water instead of oil or other comestible liquid. The tank was attached to pipes that extended behind the wagon and sprayed water along the wagon’s route, moistening the dirt roads and reducing dust. Since many towns had no pavement, such sprinklers made for a much cleaner city and populace.
The description states:
THE STREET SPRINKLER
It kept down the dust in Grandfather’s Day. One of the many horse-drawn rigs on display among 30,000 items in 22 buildings on 2 1/2 city blocks showing man’s progress since 1830. Located 130 miles west of Lincoln, Nebr., on U. S. 6 & 34.
–The card most likely dates from the 1960s.