. The Journal of laboratory and clinical medicine . tened in a horizontal direction to the posterior surface of thecylinder. It serves as a means of adjusting the entire apparatus securely inthe clamp of an upright stand (Fig. 2). The aforesaid tubes B and B-^ possess an internal diameter of 2 cm. and anoutside diameter of about cm. They are curved and descend obliquelyalong the o])posite sides of the cylinder to the lateral outlets B and B^ ofvalve y. The latter consists of a capsule of brass which is fastened to the floorof the cylinder. It contains a rotating disc, measuring 7 cm. in di
. The Journal of laboratory and clinical medicine . tened in a horizontal direction to the posterior surface of thecylinder. It serves as a means of adjusting the entire apparatus securely inthe clamp of an upright stand (Fig. 2). The aforesaid tubes B and B-^ possess an internal diameter of 2 cm. and anoutside diameter of about cm. They are curved and descend obliquelyalong the o])posite sides of the cylinder to the lateral outlets B and B^ ofvalve y. The latter consists of a capsule of brass which is fastened to the floorof the cylinder. It contains a rotating disc, measuring 7 cm. in diameter and3 cm. in height. Two U-shaped tubes, possessing a diameter of 2 em., pierceits mass in opposite directions to one another. The vertical axis F traversing *Froin the Physiological Laboratory of Columbia University. Mr. Joseph Becker, A^7 W. Fifty-ninth street, New York, has agreed to manufacture this instru-ment according to s;iecifications. Received for publication, January 1, 1922. 681 G82 THE JOURNAL OF LABORATORY AND CLINICAL MEDICINE. A XEW TYPE OF RECORDING SPIROMETER 683 its center serves as a means of changing the position of tliese tubes, so that theair entering tlirough orifice A^ may be diverted at anj^ time either into tube Bor tube B^. Two small metal projections upon the floor of the capsule contain-ing the disc indicate the positions which the handle of the axis must assumein order to cause the air to flow alternately in these directions. If the entering air is diverted from tube ^4^ into tube B, the piston willbe made to move from left to right. As soon as it has reached its extremeposition against the thin rods E-^ attached to cover D^, the position of therotating disc is quickly changed. Orifice ^^ is thereby brought into com-munication with tube B^. The air now rushes into the compartment belowcover Z>i and causes the piston to move from right to left. The rotating discis again reversed as soon as the piston has attained its extreme left position.
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Keywords: ., bookcentury1900, bookdecade1910, booksubject, booksubjectmedicine
