Specification of Henry Negretti and Joseph Warren Zambra : health indicator.

  • Negretti, Henry.
Date:
1874
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Henry Negretti and Joseph Warren Zambra : health indicator. Source: Wellcome Collection.

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    Provisional Specification. ’ A.D. 1874.—N° 3585. 3 Negretti 8f Zamira's Improved Health Indicator. so low a temperature as water, and therefore should the instrument become deranged by an air bubble getting into the bore it will only be necessary to immerse the bulb in hot water, when the air bubble will be driven into the air chamber above, and will remain there. In order that observations may be taken at leisure and with accuracy, we sometimes adapt to the outside of the tube a sliding index, which the observer can slide up or down the tube to the point where the column of fusel oil or other liquid has stopped. He may then remove the instrument from the patient and examine it at leisure. LONDON: Printed by George Eoward Eyre and William Spottiswoode, Printers to the Queens most Excellent Majesty. 1875.