|Alternative reference number||NLB/45 p92|
|Title||Copy letter from Robert William Frederick Harrison to Messrs Longmans, Green & Co|
|Date||5 January 1912|
|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.'