Keystone View Company
Changing Fixation from 7 to 4 requires 11 1/2 prism diopters of Positive Convergence. The Keystone Eye Comfort and Depth-Perception Series.

Changing Fixation from 7 to 4 requires 11 1/2 prism diopters of Positive Convergence. The Keystone Eye Comfort and Depth-Perception Series.

Public Domain

En lire plusFavori

Artist Keystone View CompanyAmerican, active 1892–1949

Artist Underwood & UnderwoodAmerican, active 1882–1940s

CultureAmerican

Titles

Changing Fixation from 7 to 4 requires 11 1/2 prism diopters of Positive Convergence. The Keystone Eye Comfort and Depth-Perception Series.

Dateabout 1930

MediumGelatin silver print, stereograph

DimensionsImage (Each): 3 1/16 × 3 in. (7.8 × 7.6 cm)
Sheet: 3 1/16 × 6 in. (7.8 × 15.2 cm)
Mount: 3 7/16 × 6 15/16 in. (8.7 × 17.7 cm)

Credit LineGift of Malcolm Daniel and Darryl Morrison

Object number2021.555

Non exposé

Explore Further

Department

Photography

Object Type

PHOTOGRAPHS

ProvenanceMalcolm Daniel and Darryl Morrison; given to MFAH, 2021.
Inscriptions, Signatures and Marks

Printed, mount recto, left: KEYSTONE STEREOSCOPIC SERVICE // SKS // COPYRIGHT UNDERWOOD & UNDERWOOD, INC.
Printed, mount recto, top center: EC // 3
Printed, mount recto, top right corner: B01
Printed, mount recto, right: KEYSTONE VIEW COMPANY // SKS // OFFICE AND STUDIOS // MEADVILLE, PENNA. MADE IN THE U. S. A.
Printed, mount verso: THE KEYSTONE EYE COMFORT // AND DEPTH PERCEPTION // SERIES // For the Development of Comfortable Vision // and a High Degree of Depth Perception // // E. C. 3–V32931 Changing Fixation from 7 to 4 requires 11 ½ prism diopters of Positive Con//vergence. // // KEYSTONE VIEW COMPANY, Meadville, Penna. Printed in U. S. A.

Cataloguing data may change with further research.

If you have questions about this work of art or the MFAH Online Collection please contact us.