ILLUSTRATIONS. VII 
Page. 
Fig. 17. Die for porcelain tubes 96 
18. Disposition of thermo-electric apparatus 97 
19. Double key 97 
20. Standard Dani ell cell lOu 
21. Chart showing the relation of temperature and electromotive force; • 
thermo-couples Nos. 17 and 18 114 
22. Chart showing the relation of temperature aud electromotive force; 
thermo-couples Nos. 22, 35, 36, 37, 38, 39, 40 116 
23. Apparatus for melting point of platinum 124 
24. Resistometer 132 
25. Detached rider 132 
26. Chart showing the relation between electrical resistance aud temper- 
ature coefficient of platinum alloys 150 
27. Chart showing the relation between electrical conductivity and tem- 
perature coefficient of platinum alloys 162 
28. Tubular displacement air thermometer 166 
29. (Withdrawn.) 
30. Diagram of Jolly air thermometer aud bulb 168 
31. Non-inglazed, spherical air thermometer bulb 172 
32. Non-inglazed, reentrant air thermometer bulb 173 
33. Inglazed, spherical air thermometer bulb 174 
34. Machine for soldering porcelain ; elevation 175 
35. Machine for soldering porcelain; plan 176 
35a. Gasometers 179 
36. Revolving muffle ; diagram 181 
36a. Elliptic revolving muffle ; diagram 181 
37. Revolving muffle and f uruace ; longitudinal section 182 
38. Revolving muffle and furnace ; plan '. 184 
39. Temperature and electromotive force of thermo-couples in corre- 
sponding time series 202 
40. Constant pressure air thermometer 209 
41. Chart showing the variation of thermo-electromotive force with tem- 
perature 226 
42. Chart, showing the variation of thermo-electromotive force with tem- 
perature 228 
43. General disposition of apparatus for viscosity measurement 243 
44. Diagram of receiver for distributing pressure 246 
45. Side elevation of the capillary apparatus 247 
46. Plan of the capillary apparatus , 248 
47. Vertical section through helix 258 
47a. Plan of helix and thermo-couples t 264 
48. Chart showing viscosity as a function of temperature 264 
49. i 
50. | 
51. } Diagram of practical transpiration pvrometers 303 
52. J 
53. J 
54. Chart showing the relation between apparent viscosity and pressure. 304 
55. Disposition of apparatus for differential measurements 305 
