| Description | 'I am unable to identify 3 figures from the list of blocks which Sir Wm Abney wishes to see use in his book on Trichnomatic Vision. The following is a transcript of the information respecting them given on the list.
1. Diagram of the modified apparatus III ! 1892 Fig 1. Diagram of the colour patch apparatus.
2. also a small cut bellow [handwritten diagram].
3. Transactions: [?] of eye to light a colour (1897) fig 8 p 303.' |