1 ILLUSTRATIONS. 
Page. 
FlG. 36. Revolving muffle ; diagram -. 181 
36a. Elliptic revolving muffle ; diagram 181 
37. Revolving muffle and furnace ; longitudinal section 182 
38. Revolving muffle and furnace ; plan 184 
39. Temperature and electromotive force of thermo-couples, in correspond- 
ing 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 264 
48. Chart showing viscosity as a function of temperature 264 
490 
50. | 
51. S Diagrams of practical transpiration pyrometers 303 
52. 
53. 
54. Chart showing the relation between apparent viscosity and pressure . . 304 
55. Disposition of apparatus for differential measurements 305 
(664) 
