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
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
`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
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
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
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)