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Graduated scale for ozone test papers, 1851-1900.

Graduated scale for ozone test papers, 1851-1900.

1851-1900
Ozonometer no.81 by L. Golaz

Ozonometer no.81 by L. Golaz

Part associated with scale of graduated tints for an ozonometerby Negretti & Zambra, London, England 1851-1900.

Graduated scale for ozone test papers, 1851-1900.

1851-1900
Scale of graduated tints for an ozonometer by Negretti & Zambra, London, England 1851-1900.

Graduated scale for ozone test papers, 1851-1900.

1851-1900