[James Dewar & W.J.Green]

MS File A: 1-44

Low temperature studies: experiments with thin membranes.

1. Quartz experiments; double and single diaphragms; relative absorptions and transmissions of various screens; charcoal thermoscope - cell surrounded by silvered glass vacuum vessel containing black paper lining; charcoal thermoscope - cell contained in German silver tube immersed in liquid air; comparison of silvered and unsilvered vacuum vessels. March-April 1919; 34pp. MS; DEWAR/DE2A/1.

2. Charcoal thermostat - membrane A: notes of experiments using German silver tube; with diagrams showing absorption of nitrogen in liquid nitrogen, and life of membrane and sensibility at 13° and 100°. May-July 1919; 44pp, MS; DEWAR/DE2A/2.

3. Charcoal thermostat - membrane B: notes and curve of relation of depth of air over membrane and effect at room temperature and 100°.May 1919; 6pp, MS; DEWAR/DE2A/3.

4. Charcoal thermostat fitted with trap door - membrane C. Experimental notes, including experiments without trap door and experiments on transfer cell etc. to spherical vessel; with radiation curve. June 1919; 10pp, MS; DEWAR/DE2A/4.

5. Charcoal thermostat - membrane D. Experiments with cell with 2cm apeture, also with apparatus whereby inner vessel projects above outer vessel; external cooling. June 1919. 10pp, MS; DEWAR/DE2A/5.

6. Membrane E. Experiments with average height of liquid, 5cms: external cooling. June-July 1919; 30pp, MS; DEWAR/DE2A/6.

7. Membrane F. Use of fine CN charcoal previously heated and then cooled in oxygen; bright Cu disc immediately below chiffon; vertical H2SO4 manometer; vessel cooled externally. Includes experiments in which inner vessel projects above outer vessel, use of spherical and cylindrical vessels. July 1919; 22pp, MS; DEWAR/DE2A/7.

8. Membrane G: bright polished brass plate immediately below chiffon; same charcoal reheated and cooled in oxygen; vessel cooled externally. Includes experiment in which cell kept cooled overnight. July-August 1919; 22pp, MS; DEWAR/DE2A/8.

9. Membrane H: vessel cooled externally. Includes notes on examination of inside of vessel with Tyndall cone and on modifications to copper hood; brief note on effect of copper disc removal on clarity of the atmosphere. Sept., 1919; 20pp, MS; DEWAR/DE2A/9.

10. Membrane I: experiments include use of varying depths of liquid air and liquid oxygen, use of copper disc stopper, lowering of temperature by capillary hydrogen current, vessels stood over CaC12 overnight. With curves - variation in depth of liquid nitrogen and of air. Sept-Oct. 1919; 44pp, MS; DEWAR/DE2A/10.

11. Membrane J: chiefly experiments in which cell stood over CaC12; note on experiment in which silver chloride plates superposed on each other and transparency to light decreased Oct. 1919; 12pp, MS; DEWAR/DE2A/11.

12. Membrane K: experiments in which cell stood over CaC12 overnight; use of cell with AgC1 window; experiments in which rock salt luted on to ebonite cell, mahogany cell, and to stretched and unstretched membranes. Includes transmission curve - variation of thickness of mica with transparency. Oct-Nov. 1919; 26pp, MS; DEWAR/DE2A/12.

13. Membrane L: includes experiments on helium and hydrogen saturation and on transparency of screens at different temperatures. Dec. 1919; 24pp, MS; DEWAR/DE2A/13

14. Membrane M; notes of experimental results, including use of alcohol manometer and cooling of membrane overnight. Dec. 1919-Jan. 1920p; 8pp, MS; DEWAR/DE2A/14.

15. Experiments using AgC1 plate on cell instead of rubber membrane; includes experiments using lead disc as shutter instead of trap door. Nov. 1919; 18pp, MS; DEWAR/DE2A/15.

16. Experiments using rock salt window on cell instead of rubber membrane; Pb disc used as shutter in all experiments instead of trap door. Nov. 1919; 6pp, MS; DEWAR/DE2A/15A.

17. Reflections, dispersions and transmissions: notes on H O film between AgCl plates; screens, discs and membranes; inversions - note of transmissions for various substances, e.g. glass on phosphorus/phosphorus on glass. [1919/20] 8pp, MS; DEWAR/DE2A/16.

18. Curves showing time of reversion; external cooling of AgCl cell and of rubber membrane cell with liquid air; dynamic flow of manometer; notes on hydrogen thermometer - cell with tin plate instead of rubber membrane. Dec. 1919. 12pp, MS; DEWAR/DE2A/17.

19. Time and displacement curves; free radiation. Rubber membrane cell and external cooling; use of vertical or horizontal manometer. Dec. 1919; 18pp, MS; DEWAR/DE2A/1/18.

20. Relative elasticity of rubber membrane under pressure at 11°C and liquid air: curves and notes. Dec. 1919; 8pp, MS; DEWAR/DE2A/19.

21. Notes of transmissive powers of various substances, corrected for reflections. [ca. Dec 1919]; 2pp, MS; DEWAR/DE2A/20.

22. Notes on reflection factors and on films. [ca. Dec 1919]; 1½pp, MS; DEWAR/DE2A/2.

23. Notes: relative dp/dT of both air and hydrogen in charcoal to liquid oxygen. [1919/20]; ½ p, MS; DEWAR/DE2A/22.

24. Lists of transmission values. [1919/20]; 16pp, MS; DEWAR/DE2A/23.

25. List of extinction coefficients for various substances. [1919/20]; 1p, MS; DEWAR/DE2A/24.

26. Notes and curves relating to radiation, including curve for red hot platinum wire radiation (Tyndall), Fresnel's reflection correction for normally incident light, curve of temperature of perfect radiator, curve of reflection at plane surface (Fresnel), curve of heat spectrum at three different temperatures. 1920; 24pp, MS; DEWAR/DE2A/25.

27. Notes and curves: charcoal thermoscope, corrected values of "D" and observed "T" for superposition of various plates. [ca. 1920]; 6pp, MS; DEWAR/DE2A/26.

28. Latent heat. Figure showing charcoal saturated with helium. [1920]; 1p, MS; DEWAR/DE2A/27.

29. Latent heat. Figure showing charcoal saturated with hydrogen. [1920]; 1 p, MS; DEWAR/DE2A/28.

30. Air saturation: curve showing response of thermoscope to additions of pressure of alcohol manometer, with corresponding increments of temperature of liquid oxygen. [1920]; 1p, MS; DEWAR/DE2A/29.

31. Curve of unscreened radiation and radiation through mica screens - use of horizontal measuring tube. [1920] 1p, MS; DEWAR/DE2A/30.

32. Radiation curves; horizontal scaled tubes - H2SO4 tube and alcohol tube. [1920]; 1p, MS; DEWAR/DE2A/31.

33. Radiation curves, vertical manometer, 15°C radiation: H2SO4 manometer, alcohol, and gas cooled cell - H2SO4 manometer. [1920]; 1p, MS; DEWAR/DE2A/32.

34. Curves comparing sensibilities of cell when charcoal is saturated at liquid air temperature with air, hydrogen and helium respectively. [1920]; 1p. MS; DEWAR/DE2A/33.

35. Curves: radiation at 100°C, vertical manometer. Curves for H2SO4 manometer, alcohol and gas cooled cell - H2SO4 manometer. [1920]; 1p, MS, DEWAR/DE2A/34.

36. Notes. Charcoal thermoscope: gas evolution by absorption at 90°A of radiation from black body at 300°A. [1920]; 2pp; MS; DEWAR/DE2A/35.

37. Notes, chiefly references to literature, concerning radiation and transmissive power. 1920; 5pp, MS; DEWAR/DE2A/36.

38. Notes on radiation: black body interchange; gas evolution theory; reduction of reflecting power by thin film of alcohol. [1920]; 1¾pp, MS; DEWAR/DE2A/37.

39. Notes: black radiation interchange down a reflecting cylinder. April 1920; 1p, MS; DEWAR/DE2A/38.

40. Notes: radiation through liquid air. 1919; 26pp, MS; DEWAR/DE2A/39.

41. Curves: rate of cooling of interior of unsilvered vacuum vessel; note added [by Dewar] of other experiments to be done. undated; 4pp, MS; DEWAR/DE2A/40.

42. Notes on external cooling of vessels; undated. 1p, MS; DEWAR/DE2A/41.

43. Curves: increase of pressure of gases in charcoal caused by increasing temperature. undated. 2pp, MS; DEWAR/DE2A/42.

44. Notes on radiation. 1919; 8pp, MS; DEWAR/DE2A/43

45. Cloudland studies. Radiation curves, notes, drawings of apparatus. [1921]; 20pp, MS; DEWAR/DE2A/44.