A bicycle ergometer with an electric brake / by Francis G. Benedict and Walter G. Cady.

  • Francis Gano Benedict
Date:
1912
Catalogue details

Licence: In copyright

Credit: A bicycle ergometer with an electric brake / by Francis G. Benedict and Walter G. Cady. Source: Wellcome Collection.

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    CONTENTS. Part I. Page Introduction Detailed description of the bicycle ergometer . . . General considerations regarding method of use . Method of calibration The technique of a calibration experiment 12 Calibration tests of Ergometer I 14 Earlier calibration tests 14 Calibration tests of 1911 15 Friction tests with Ergometer I ’ ’ 21 Calibration tests of Ergometer II 22 Friction tests with Ergometer II 29 Part III. The magnetic reactions produced by a copper disk rotating between the poles of a magnet Measurement of magnetic field by means of a bismuth spiral..'..... .. Comparison of results with theory Further experiments with the eddy currents ’ Influence of temperature on the constancy of the bicycle ergometer. The design of electric brakes 31 33 37 39 42 42 ILLUSTRATIONS. Fig. 1. Side and top views of Ergometer II 2. Electro-magnet and copper disk of Ergometer II.!!!!!.! L ’ 3. Scheme for calibration of the ergometer in a respiration chamber 4. Heat per revolution of Ergometer I for currents of 0.7 and 0 8 ampere through the field 5. Calibration curve of Ergometer I for magnetizing current of 6.9 ampere’, o. Calibration curve of Ergometer I for magnetizing current of 1 1 am- peres 7. Calibration curve of Ergometer I for magnetizing current of 1 25 amperes 8. Calibration curves of Ergometer I for magnetizing current of 0 7 to 1 25 amperes 9. Calibration curve of Ergometer II for magnetizing current of 0 95 ampere 10. Calibration curve of Ergometer II for magnetizing current of 1 10 amperes 11. Calibration curve of Ergometer II for magnetizing current of 1 35 amperes 12. Calibration curve of Ergometer II for magnetizing current of 1 50 amperes 13. Calibration curves of Ergometer II for magnetizing current of 1 25 amperes 14. Calibration curves of Ergometer II for magnetizing current of 0 95 to 1.50 amperes 15. Magnetic induction across the air-gap 16. Magnetic lines and current loops on surface of rotating disk... Pago 5 6 13 18 19 19 20 21 24 24 25 26 27 28 35 40 iii (OMCnW