Phosgene.

Date:
1939
Catalogue details

Licence: Public Domain Mark

Credit: Phosgene. Source: Wellcome Collection.

    5/16 (page 3)
    object of the tests is not to obtain an extreme degree of accuracy, but to give a rapid indication of the relative safety of the atmosphere. A result which is close to the danger limit should always be regarded as indicating that conditions are dangerous. It must be borne in mind that each of the above tests will indicate only the presence or absence of the specific poison, and in cases where any other poison is liable to occur, the relevant test for it must be applied before the atmosphere is adjudged as safe to breathe. Further, none of the tests will indicate the danger which exists in cases where the oxygen content of an atmosphere is dangerously deficient. H.M. FACTORY INSPECTORATE, MINISTRY OF LABOUR AND NATIONAL SERVICE, 19 St. James’s Square, London, S.W.1. iA sf imac My tat st Od Oke © “ weet — 8 car tas Saw ot, RS $ y “- Boateats eteecee ae a i * aR Y i y NOTE It should be emphasized that the object of the tests is to give a rapid determination of the relative safety of the atmosphere, and not to give an accurate estimation of the concentra- tion of dangerous vapour. The envelope inside the back of the cover contains a copy of the standard stains produced on p-dimethylaminobenzaldehyde-diphenylamine paper. Further copies of these aa ~ be obtained from H.M. Stationery Office at the price of 3s. Od. (post free s. 2d. : Crown Copyright Reserved Extracts may be reproduced provided the source is acknowledged. Pans NY ep SO ef C) — | - ee eee ; { a | 8