In pencil, lower right: 1907 / EGC / \unidentified device!
Watermark: F. J. He(ad & Co)
In ink, upper right corner of face mat: 2; in pencil below sheet on back mat: Each etching shows a moment in a movement - / we may imagine that this is the state of the / movement after 10 minutes have passed. / or it maybe the state reached after a much longer / period of time. / .EGC.