Rain King D-1 sprinkler

 These common-item type devices were so much more interesting before plastic was invented. This 1932 patent lawn sprinkler is largely made of cast iron and brass.

Patent 1883264 applies to the design of the sprinkler nozzle, and is assigned to HORACE C. WRIGHT, OF CHICAGO, ILLINOIS, ASSIGNED TO CHICAGO FLEXIBLE SHAFT COMPANY, OF CHICAGO, ELINOIS, A CORPORATION OF ILLINOIS ADJUSTABLE NOZZLE