Volume 1

Experiments upon vegetables, discovering their great power of purifying the common air in the sun-shine, and of injuring it ... at night. To which is joined, a new method of examining the ... salubrity of the atmosphere / [Jan Ingenhousz].

  • Jan Ingenhousz
Date:
1779
Catalogue details

Licence: Public Domain Mark

Credit: Experiments upon vegetables, discovering their great power of purifying the common air in the sun-shine, and of injuring it ... at night. To which is joined, a new method of examining the ... salubrity of the atmosphere / [Jan Ingenhousz]. Source: Wellcome Collection.

    355/402 (page 281)
    [ »8i ] meafure, as is expreffed in the plate by BB in Fig. I. Then I obferve with what number of the fcale the firft divifion of the glafs tube above the column of water coincides, which fhews me at once how many fub-divilions are remaining from the two meafures of airs, or from the 200 fubdivifions let up in the tube, and thus indicates the degree of goodnefs of common air, or in¬ deed of any air approaching in goodnefs to common air, or being r of an inferior quality. But this method will not do in examining dephlogifticated air, as this air re¬ quires more nitrous air to bring it to a full faturation. By this limple and eafy method the whole opera¬ tion is performed in three or four minutes ; and its accuracy is fuch, that frequently in ten trials, made with