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Six interference colour filters

Metal stand supporting glass filter

Thirty six tobacco pipe filters to absorb nicotine

Box of Glass Fibre Filters

Interference colour filter, 3" diameter.

100 SM type filters in plastic case

1975-1979

Twenty eight filters in case

Wedge interference colour filter to show the spectrum

Berkefeld filter

1870-1930

Clear glass

1851-1920

Set of six green glass filters

White porcelain filter

1880-1920

Three coloured filters

Charcoal filter in case, c.1900

Charcoal filter in case, c.1900

1890-1920
Charcoal filter in case, c.1900

Charcoal filter in case, c.1900

1890-1920
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

ThinPrep Pap Test Filters by Hologic, 1990-2017

ThinPrep Pap Test Filters by Hologic

1990-2017
Two sintered-glass filters for the removal of bacteria from solutions, used at the Common Cold Research Unit

Two sintered-glass filters for the removal of bacteria from solutions

`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

Portable air-pollution sampler for use against radioactive material, metal and plastic, with holster, made by Casella, London, England, 1975-1979.

Portable air-pollution sampler for use against radioactive material

1975-1979
Two K (Class II) respirator filters for Silner 12 mask, for use against ammonia, in 'AGA Gasfilter 82' cardboard packaging.

K (Class II) filters for Silner 12 respirator mask

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

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
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
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

Two B (Class II) respirator filters for Silner 12 mask, for use against acid gases and halogens, in 'AGA Gasfilter 82' cardboard packaging.

B (Class II) filters for Silner 12 respirator mask

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
Transfusion filter and three gas mantle filters, association?, 1939-1946.

Transfusion filter and three gas mantle filters

1939-1946
Four Elford filter assemblies with bottle containing two collodion filters, and spanners, used at the Common Cold Research Unit in the separation of different size viruses

Four Elford filter assemblies with bottle containing two collodion filters

Filters and filter components for Silner 12 respirator mask, A (Class II), B (Class II), K (Class II), and Kemira (Class IIb) types, in AGA branded cardboard packaging.

Filters for Silner 12 respirator mask

Two A (Class II) respirator filters for Silner 12 mask, for use against organic vapours and solvents, in 'AGA Gasfilter 82' cardboard packaging.

A (Class II) filters for Silner 12 respirator mask