(select the image to see a larger version.)
Silver print; 10"x8"; ca. 1900.
This one we know; it is identified on the back of the image. The box-type helmet was designed for a specific use at the turn-of-the-century, according to the description on the back.
As a hint, the photograph is from the Buckeye Steel Castings Photograph Collection in the Archives/Library, which is a collection of late 19th century and early 20th century foundry scenes.
What is this item?