Objects

Viewing Record 35 of 71
Previous Record  Next Record
Switch Views: Lightbox | Image List | List

Kelvin Vertex Chart
ARCHIVAL ITEMS
selection chart
Kelvin Lenses Limited
Europe: United Kingdom, England, Lancashire, Manchester
Late 20th c.
card; paper
overall: 225 mm x 119 mm

Set of charts for calculating the power of a contact lens at a given vertex distance. Double-side chart for the effective power of lenses in air, minus powers, and single-sided chart for the same in plus powers, both pasted into an outer card cover pink on the outside with glossy finish.


2021.188

Gift of Mr Graeme Holland, 2021



Browse by