On the back of this photograph it states that this is a "view of Rockford looking southeast from the new Gas Holder on S. Avon Street." A gas holder, or gasometer, is described as a large container in which natural gas or town gas is stored near atmospheric pressure at ambient temperatures.
Midway Village Museum
3.5" x 3.5"
“Gas Holder.,” Midway Village Museum - Digital Collections, accessed July 29, 2021, https://midwayvillagemuseumdigitalcollections.omeka.net/items/show/1565.