EN/1/44
·
Item
·
14 Jul 1912
EN/1/15
·
Item
·
27-30 Jan 1908
Includes coloured threads used for tests
EN/1/11
·
Item
·
19 Jan 1908
EN/1/36
·
Item
·
26 Mar-10 Jun 1912
EN/1/7
·
Item
·
30 Sep 1907
Contains the result of a colour blindness examination on D.G Marshall and the coloured thread samples used