A guide to the examination of the urine : designed chiefly for the use of clinical clerks and students / by J. Wickham Legg.

  • Legg, J. Wickham (John Wickham), 1843-1921.
Date:
1876
Catalogue details

Licence: Public Domain Mark

Credit: A guide to the examination of the urine : designed chiefly for the use of clinical clerks and students / by J. Wickham Legg. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    15/110 (page 7)
    the urine to be examined is poured into a cylin- drical glass, and care is taken to remove all the froth which may form, either by blotting paper, or by overfilling the vessel. The urometer must then be slowly introduced, and allowed to float freely in the urine, without touching either the side or bottom of the vessel. Since the fluid accumulates around the stem of the urome- ter from the physical force of attraction, the ; specific gravity appears to be higher than it really is, when read off while the eye is above the surface of the fluid; to obtain a correct reading, therefore, the eye must be lowered to the level of the surface of the fluid, and the number on the stem ascertained by looking at it through the urine: having noted this, the uro- meter should be depressed in the urine, and again allowed to come to rest, when the number may be again read ofT; the second estimation is made to correct any mistake that may have taken place in the first reading. The specific gravity thus ascertained should be noted dowm at once. The urine must be of the temperature of the surrounding air. otherwise great errors may creep in. The knowledge of the specific gravity of a