Read A Bicycle Ergometer with an Electric Brake

A Bicycle Ergometer with an Electric Brake

Francis Gano Benedict

4.9/5 (34265 ratings)

Description:Excerpt from A Bicycle Ergometer With an Electric Brake A practical application of thermodynamic principles that has interested economists and physiologists has been the problem of determining the mechanical efficiency of the human body as a machine. Not only were the earlier writers handicapped by an inability to determine accurately the intake of energy by the body in food and drink - a handicap that has since been admirably overcome by the use of the accurate calori-metric bomb - but they were likewise handicapped by an inadequate measurement of the mechanical output of the individual experimented upon. A study of this subject, therefore, must divide itself into two parts: first, the determination of the intake of energy, and second, the measurement and computation of the amount of work done. The present paper is concerned with the second of these two divisions. Without going into an extended historical discussion relative to this subject, it may be said that the attempts to make computations of the intake and output of energy have been very numerous and for the most part extremely crude, those of the output of energy dealing usually with the work of either the arms or the legs. Among the various methods used for studying the amount of work done by the arm may be mentioned the lifting of weights, the filing of cast iron, pulling up weights by means of a rope, shoveling earth to a height of about 2 meters, pulling on an oar, pumping water, hammering, turning a crank or winch, and the more accurate method recently employed by Zuntz of using a brake ergometer, and Johansson of raising weights. In tests with the leg-motion, the muscular work has been for the most part confined to lifting the body to a definite height by ascending a ladder or stairs, carrying weights up stairs, wheeling a loaded wheelbarrow up an incline, walking on a treadmill, and, more especially, riding a bicycle or an apparatus similar in form. In studying the muscular work in the leg-motion of bicycling, a special apparatus has been extensively employed. One of the earlier types of this machine was that described by Atwater and Benedict, in which a pulley attached to the armature shaft of a small dynamo was pressed against the rear wheel of a bicycle; the current generated by this dynamo as it revolved by the movement of the pedals was then measured. By using the dynamo as a motor, the machine could also be calibrated.We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with A Bicycle Ergometer with an Electric Brake. To get started finding A Bicycle Ergometer with an Electric Brake, you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

Pages: —

Format: PDF, EPUB & Kindle Edition

Publisher: —

Release: —

ISBN: 1330557824

Description: Excerpt from A Bicycle Ergometer With an Electric Brake A practical application of thermodynamic principles that has interested economists and physiologists has been the problem of determining the mechanical efficiency of the human body as a machine. Not only were the earlier writers handicapped by an inability to determine accurately the intake of energy by the body in food and drink - a handicap that has since been admirably overcome by the use of the accurate calori-metric bomb - but they were likewise handicapped by an inadequate measurement of the mechanical output of the individual experimented upon. A study of this subject, therefore, must divide itself into two parts: first, the determination of the intake of energy, and second, the measurement and computation of the amount of work done. The present paper is concerned with the second of these two divisions. Without going into an extended historical discussion relative to this subject, it may be said that the attempts to make computations of the intake and output of energy have been very numerous and for the most part extremely crude, those of the output of energy dealing usually with the work of either the arms or the legs. Among the various methods used for studying the amount of work done by the arm may be mentioned the lifting of weights, the filing of cast iron, pulling up weights by means of a rope, shoveling earth to a height of about 2 meters, pulling on an oar, pumping water, hammering, turning a crank or winch, and the more accurate method recently employed by Zuntz of using a brake ergometer, and Johansson of raising weights. In tests with the leg-motion, the muscular work has been for the most part confined to lifting the body to a definite height by ascending a ladder or stairs, carrying weights up stairs, wheeling a loaded wheelbarrow up an incline, walking on a treadmill, and, more especially, riding a bicycle or an apparatus similar in form. In studying the muscular work in the leg-motion of bicycling, a special apparatus has been extensively employed. One of the earlier types of this machine was that described by Atwater and Benedict, in which a pulley attached to the armature shaft of a small dynamo was pressed against the rear wheel of a bicycle; the current generated by this dynamo as it revolved by the movement of the pedals was then measured. By using the dynamo as a motor, the machine could also be calibrated.We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with A Bicycle Ergometer with an Electric Brake. To get started finding A Bicycle Ergometer with an Electric Brake, you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

Special Offer | $0.00

Special Offer! | $0.00

A Bicycle Ergometer with an Electric Brake

A Bicycle Ergometer with an Electric Brake

More Books

A Study of Prolonged Fasting, by Francis Gano Benedict 1915 [Leather Bound]

A Study of Prolonged Fasting, by Francis Gano Benedict 1915 [Leather Bound]

A Study of Prolonged Fasting, by Francis Gano Benedict. 1915 Volume no.203 [Leather Bound]

A Study of Prolonged Fasting, by Francis Gano Benedict. 1915 Volume no.203 [Leather Bound]

The Influence of Inanition On Metabolism

The Influence of Inanition On Metabolism

Chemical Lecture Experiments, by Francis Gano Benedict. [Leatherbound] (1901) [Leather Bound]

Chemical Lecture Experiments, by Francis Gano Benedict. [Leatherbound] (1901) [Leather Bound]

The Influence of Inanition on Metabolism / by Francis Gano Benedict 1907 [Leather Bound]

The Influence of Inanition on Metabolism / by Francis Gano Benedict 1907 [Leather Bound]

A Study of Prolonged Fasting, by Francis Gano Benedict. 1915 Volume 203 [Leather Bound]

A Study of Prolonged Fasting, by Francis Gano Benedict. 1915 Volume 203 [Leather Bound]

A study of prolonged fasting by Francis Gano Benedict. v.203. Volume v.203 1915 [Leather Bound]

A study of prolonged fasting by Francis Gano Benedict. v.203. Volume v.203 1915 [Leather Bound]

Chemical Lecture Experiments (Classic Reprint)

Chemical Lecture Experiments (Classic Reprint)

A Study of Prolonged Fasting (Classic Reprint) by Francis Gano Benedict (2015-09-27)

A Study of Prolonged Fasting (Classic Reprint) by Francis Gano Benedict (2015-09-27)