The spirometer, the stethoscope, & scale-balance : their use in discriminating diseases of the chest, and their value in life offices; with remarks on the selection of lives for life assurance companies / by John Hutchinson.

Date:
1852
Catalogue details

Licence: Public Domain Mark

Credit: The spirometer, the stethoscope, & scale-balance : their use in discriminating diseases of the chest, and their value in life offices; with remarks on the selection of lives for life assurance companies / by John Hutchinson. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    jManufactuee of the SPIROMETER, SPIROMETER-BALANCE, AND STETHOSCOPE. 150. The Spirometeu requires more care in its construction than is commonly believed ; it is not merely a measuring gasometer ; as sucli it may be mathematically correct and the workmanship may be exquisite, yet not correctly measui'e the vital capacity, A man who attempts to furnish an Improved Spirometer, may have an exquisite workman to carry out his views, but pi'obably the two men lack the experience of knowing the mmierously different ways men have of breathing. We have seen Spirometers sold which never can agree with our table of vital capacity, yet they profess to do so. A Spirometer must as it were elicit the air out of the lungs ; if it causes the least resistance to be tailed hack upon the expiratory muscles, which muscles are as sensitive as the horns of a snail, they will in turn give hack, and not force out the complete vital capacity volume. The Spirometer is correctly manufactured at Mr. Ewaht's, Quickset Eow, New Eoad; and may be obtained of INIcssrs. Negbetti and Zambka, Mathematical Insti-umcnt Makers, 11, Hatton Garden, London; finished in a becoming manner, for the consulting room or for Life Offices. Spieometer-Balance.—The scale we recommend for welo-hino- IS REPRESENTED in the annexed figure, with a standard connected to it. This is a modification of the French scale, multiplying ten times; they wear remarkably well, and will tell the weight of a man within two ounces. AVe have used many kinds of scales, but have found none so correct and lasting as the kind in question. This Balance can be obtained of INIr. W. Poupaud, Scale Maker, 30, Wych Street, Strand, London, price not exceeding £8 8s. STETnoscoPE.—The Stethoscope we find best calculated to convey sound, is constracted with peculiar lightness; although seven inches