Details
A Palmer's Computing Scale,
Improved by Fuller, with printed scale on revolving card disc in square surround, the reverse with similar Fuller's Time Telegraph -- 11.3/8 in. (29 cm.) square, circa 1850
Improved by Fuller, with printed scale on revolving card disc in square surround, the reverse with similar Fuller's Time Telegraph -- 11.3/8 in. (29 cm.) square, circa 1850