My friend found this and brought it to me. Appears to be a Crosby steam engine indicator used to draw a graph of pressure vs piston position over an engine cycle. It has a cord around a drum that looks like it was hooked to a connecting rod and then the pieces in the box mounted to some steam port. One drum held the paper strip and then an arm with a piece of lead is connected to the part that measures pressure. It is in really good shape and I had never seen one before. It has several strips of graphs plotted that are dated to mid 1920's. I thought it was pretty cool and wanted to share this bit of steam history.
