Filters for model 43 smoke stain reflectometer made by Evans Electroselenium Ltd, Halstead. 23 paper filters in total, 21 used, two unsued. filters for smoke stain reflectometer
`Untrypsinising' filter to remove fibres from specimens of cells, made using the filter from a wartime American Red Cross blood transfusion set, for laboratory use, from the Common Cold Research Unit Untrypsinising filter
One set comprising 5 pieces each 2" square, to show stages in the preparation of interference colour filters. One set comprising 5 pieces each 2" square
Chamberland filter and pump, once the property of Sir A. Houston-Keen, by Baird and Tatlock, London, 1890-1912 Chamberland filter and pump 1890-1912
Clay filter for tobacco pipe, in form of a bowl shape, broken in two pieces, English, 1880-1930 Clay filter for tobacco pipe 1880-1930
Seven filters for Riva :- SHC, B/st (Class II) Hg/st (Class IIIb), K (Class I), P3, B ( Class I), A (Class III) Seven filters for Riva :- SHC
Transfusion filter and three gas mantle filters, association?, 1939-1946. Transfusion filter and three gas mantle filters 1939-1946
Three white porcelain filters, glazed, cone shaped, with large holes in body, by Leune, 28 rue du Cardinal Lemoine, Paris, France, 1880-1920. Three white porcelain filters 1880-1920
Four filters for Silner 12 :- A (Class II), B (Class II), K (Class II), Kemira (Class IIb) Four filters for Silner 12 :- A (Class II)