Objects
Viewing Record 45 of 71Previous Record Next Record
Switch Views: Lightbox | Image List | List
Contact Lens Computer
ARCHIVAL ITEMS
selection chart
Averlan Company Limited
Europe: United Kingdom
Mid-late 20th c.
plastic
overall: 205 x 56 mm
2005.46
ARCHIVAL ITEMS
selection chart
Averlan Company Limited
Europe: United Kingdom
Mid-late 20th c.
plastic
overall: 205 x 56 mm
'Slide-rule' type calculating chart. Obverse = vertex distance and computed power; Reverse = Ultra thin fitting guide. White inner card. Blue outer sheath overprinted in black.
2005.46
Gift of A.J. Backhouse, 2003