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Cambridge: : PRINTED BY C. J. CLAY, M.A. AND SONS,

AT THE UNIVERSITY PRESS.

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THE work of the advanced class at the Cavendish Laboratory in the department of Heat during the Michaelmas Term, 1884 consisted mainly in the repetition of some of the classical experiments in the subject, using, of course, such models of the original apparatus as the laboratory could provide. It seemed not unlikely that a somewhat detailed account of this work, although not original and therefore not suitable for presentation to a learned society, might yet furnish to students in other Laboratories information of some value respecting the practical difficulties arising, and the effect of neglecting those precautions which it was beyond the power of the Laboratory or of the observer to provide for.

In the hope that this might prove to be the case, I requested the various members of the class to make themselves responsible each for the description of one or more of the experiments comprised in the syllabus. Results had been in most cases obtained during the term by several students, working independently with the same apparatus; such results are always entered in books kept in the Laboratory for the purpose, and it was understood that they were to be incorporated in the account, the different observers being indicated by initials.

It will be seen on reference to the syllabus that the experiments are not all described. With the exception however of No. 6 their arrangement here presented no points of difference from the ordinary descriptions in the books. The apparatus for No. 6 was not completed until so late in the term that there was no time to take observations with it.

The students very kindly undertook the responsibility and wrote the descriptions which are printed below. I have done but little by way of editing; I have however added a few notes where they seemed necessary.

а

W. N. SHAW.

CAVENDISH LABORATORY,

January, 1885.

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1. MANUFACTURE AND CALIBRATION OF A MERCURY THERMOMETER.

Maxwell, Heat, Chap. ii.

MS. Kohlrausch, Phys. Meas. p. 58.
2. COMPARISON OF MERCURY AND AIR THERMOMETERS.

Elementary Course, No. 38.
Balfour Stewart, Heat, Chap. iv.
Regnault, “Sur la mesure des Températures,” Mémoires de

l'Académie, T. XXI. 3. THE WEIGHT THERMOMETER. DETERMINATION OF THE COEFFICIENT

OF EXPANSION OF GLASS.

MS. Regnault (1. c.). 4. COEFFICIENT OF LINEAR EXPANSION OF A ROD.

Elementary Course 1, No. 37. 5. COEFFICIENT OF CUBICAL EXPANSION OF A METAL BY THE AREOMETRIC

METHOD.

MS. Matthiessen, Phil. Trans. 1866. 6. COEFFICIENT OF ABSOLUTE EXPANSION OF MERCURY.

B. Stewart, $ 51.

Regnault, Mémoires de l'Académie, T. XXI. 7. DETERMINATION OF THE TEMPERATURE OF MAXIMUM DENSITY OF

WATER BY JOULE'S METHOD.

Maxwell, Chap. xvii. 8. MANUFACTURE OF AN AIR-THERMOMETER FOR USE AT COMPARATIVELY

HIGH TEMPERATURES.

MS. 9. MEASUREMENT OF HIGH TEMPERATURES BY THE RESISTANCE OF A

PLATINUM WIRE.

MS. Report of British Association, 1874, p. 242. 10. LAPLACE AND LAVOISIER'S CALORIMETER. MEASUREMENT OF THE

HEAT GENERATED IN AN INCANDESCENT ELECTRIC LAMP.

MS. Maxwell, Chap. iii. 11. BUNSEN'S ICE CALORIMETER. DETERMINATION OF THE SPECIFIC

GRAVITY OF ICE.

MS. Phil. Mag. 1871. 12. FAVRE AND SILBERMANN'S CALORIMETER.

Deschanel, p. 442.

i Glazebrook and Shaw, Practical Physics, $ 36.

13. MEASUREMENT OF HEAT BY THE METHOD OF MIXTURE. DETERMI

NATION OF THE LATENT HEAT OF STEAM,

Elementary Course!, No. 34.

Regnault, Mémoires de l'Académie, T. XXI.
14. MEASUREMENT OF HEAT BY THE METHOD OF COOLING.

Elementary Course?, No. 35.
B. Stewart, § 232.
Regnault, Ann. de Ch. et Phys. 3 Ser. IX. p. 322.

Dulong, Ann. de Ch. et Phys. X. p. 399. 15. CLÉMENT AND DÉSORMES' EXPERIMENT ON THE RATIO OF THE SPECIFIC

HEATS OF GASES.

Masson, Ann. de Ch. et de Phys. 3 Ser. LIII. p. 268.
Dupré, Théor. mécan. de la Chaleur (1869), p. 87.
Maxwell, Chap. xi.

MS. 16. DETERMINATION OF THE SPECIFIC GRAVITY OF A VAPOUR. HoF

MANN'S METHOD.

Kohlrausch, p. 50; (edit. 1883), p. 55. 17. DETERMINATION OF THE SPECIFIC GRAVITY OF A VAPOUR. DUMAS'

METHOD.

Kohlrausch, p. 45; (edit. 1883), p. 50. 18. DETERMINATION OF THE SPECIFIC GRAVITY OF A VAPOUR. VICTOR

MEYER'S METHOD.

Kohlrausch (edit. 1883), p. 56. 19. MEASUREMENT OF THE SATURATION TENSION OF WATER-VAPOUR IN

VACUO.

Regnault, Mémoires de l'Académie, XXI. p. 481. 20. MEASUREMENT OF THE SATURATION TENSION OF WATER-VAPOUR IN

AIR.

Elementary Course 3, No. 28.

Cam. Phil. Trans. 1883. 21. DEW-POINT MEASUREMENT. VERIFICATION OF REGNAULT'S FORMULA

FOR THE WET-AND-DRY-BULB THERMOMETERS.

Regnault, Ann. de Chimie. 3 Ser. T. XIV.

Elementary Course", Nos. 29, 30. . 22. COMPARISON OF THE CONDUCTIVITIES OF IRON AND COPPER.

MS.

23. EXPERIMENTS ON RADIATION.

B. Stewart, Book II., Chap. i.

1 Practical Physics, $ 39.
3 Ib. § 42.

2 Ib. § 40.
4 Ib. SS 43, 44.

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