The Keystone Eye Comfort and Depth-Perception Series / for the Developement of Comfortable Vision and a High Degree of Depth Perception
Image Not Available
Photograph
Keystone View Company
American, 1892–1963
The Keystone Eye Comfort and Depth-Perception Series / for the Developement of Comfortable Vision and a High Degree of Depth Perception
ca. 1925
Gelatin silver print
Each Image: 3.8 x 2.5 cm
Mount: 8.6 x 17.8 cm
Gift of Donald K. Weber, 2013
2013.0222.0005
Inscriptions recto (printed on mount): Keystone View Company / Studios and Factory / Meadville Penna.
recto (printed on mount): Keystone Stereoscopic Service / Copyright Keystone View Co. / made in U.S.A
verso (printed): The Keystone Eye Comfort and Depth-Perception Series / for the Developement of Comfortable Vision and a High Degree of Depth Perception
verso (printed):
E.C. 109-33290
Fusing the two upper pictures requires 14 prism diopters divergence (Prism B.I.)
Fusing the two lower pictures requires 19 prism diopters divergence (Prism B.I.)
verso (printed): Copyright Keystone View Co. / Meadville Penna. / Printed in U.S.A.
recto (printed on mount): Keystone Stereoscopic Service / Copyright Keystone View Co. / made in U.S.A
verso (printed): The Keystone Eye Comfort and Depth-Perception Series / for the Developement of Comfortable Vision and a High Degree of Depth Perception
verso (printed):
E.C. 109-33290
Fusing the two upper pictures requires 14 prism diopters divergence (Prism B.I.)
Fusing the two lower pictures requires 19 prism diopters divergence (Prism B.I.)
verso (printed): Copyright Keystone View Co. / Meadville Penna. / Printed in U.S.A.
