. Carnegie Institution of Washington publication. nd Carpenter,, Office ,1901, Berg, duBois Reymond and Zuntz, Arch. f. Anat. u. Physiol., Physiol. Abt. 1904, INTRODUCTION 5 chain was used to convey the power from the foot to the disk. The firstform of this instrument has been described in detail in a former publica-tion by Benedict and A second apparatus was constructedduring the summer of 1911 by Mr. W. E. Collins, mechanician of theNutrition Laboratory, and carefully tested. The original ergometerleaves little to be desired in the way of
. Carnegie Institution of Washington publication. nd Carpenter,, Office ,1901, Berg, duBois Reymond and Zuntz, Arch. f. Anat. u. Physiol., Physiol. Abt. 1904, INTRODUCTION 5 chain was used to convey the power from the foot to the disk. The firstform of this instrument has been described in detail in a former publica-tion by Benedict and A second apparatus was constructedduring the summer of 1911 by Mr. W. E. Collins, mechanician of theNutrition Laboratory, and carefully tested. The original ergometerleaves little to be desired in the way of accuracy, constancy, and sub-stantial construction, but as certain modifications have been made inconstructing the second instrument, a detailed description of this ergom-eter seems desirable. DETAILED DESCRIPTION OF THE BICYCLE ERGOMETER. For the latest form of bicycle ergometer, which is shown in fig. 1, ahigh-grade bicycle frame, with sprockets and pedals, was of the ordinary sprocket-chain, a special chain was used in which. Fia. 1.—Side and top views of ergometer II. the minimum resistance and maximum flexibility were secured by rollerbearings in the links. The rear wheel was replaced by a hub of the type 1 Benedict and Carpenter, U. S. Dept. Agr., Office Expt. Stas. Bui. 208, 1909, p. 11. 6 A BICYCLE ERGOMETER WITH AN ELECTRIC BRAKE commonly used on motor cycles, which was fitted to a large copper disk, cm. in diameter and approximately 6 mm. thick. A wooden splitpulley (W, fig. 2) was also placed upon the hub for experiments in whichthe apparatus would be driven by an electric motor. This has been ofespecial value in some physiological tests on coasting in which the ergom-eter was driven by a motor, the feet of the man being on the pedals andrevolving without doing any work. The apparatus was substantiallymounted upon a base-board by meansof iron braces. A type of handle-barwas selected which could be comfort-ably adjusted for the various riderswh
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