Found on an Ebay listing. Probably from the 2000’s.
Monthly Archives: April 2014
Spirometer, Jaeger Flowscreen Pro, circa 1990’s
Found on an Ebay listing. Probably manufactured in the 1990’s.
Spirometer, Joal’s, 1895
From “On respiration in singing” by Joseph Joal, Published by F.J. Rebman, 1895, page 84.
“…this instrument has a double Mariotte’s vase, composed of two chambers, placed over one another and separated by two semi-circular diaphragms, F H, which are joined by a vertical septum. The two chambers are put into communication by tube I. The apparatus being half full of water, and the liquid filling the upper reservoir, if we breathe by the mouthpiece A, a quantity of water is displaced, and flows out of the upper reservoir, into the lower one; the graduated glass permitting us to determine the level of the liquid.
“When the upper chamber is empty it suffices to turn the instrument upside down, corking the tube E, and placing the mouthpiece on the chamber D, at the same time that we raise the screw C, and close the opening C.”
Spirometer, Simplex, 1901, Advertisement
Spirometer, Wells, 1904
Spirometer, Gilford Laboratories, 1959
From 25 Years, Looking Back by Ross Baird. A history of Gilford Laboratories. Page 3. Posted at Oberlin.