Aitken's pocket dust counter, 1890.
3 4 c m
40cm
actual image size: 32cm x 26cm

Aitken's pocket dust counter, 1890.

© Science Museum / Science & Society Picture Library

Description

Contained in a case 'the size of a well-filled cigar case'. A piston action drew air into the test chamber, which was full of supersaturated air. The dust in the test sample formed nuclei for the water in the chamber to coalesce around, forming drops that could then be counted.
 

Image Ref.

10327188
 

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