INDEX. 
311 
Muffle furnace, rates of heating and cooling, 203, 
204. 
Muffle, revolving, 180,183. 
Miiller measures resistance at high tempera- 
tures, 50. 
Multiple arc, thermo-electric effect of, 82. 
Musschenbroeck, dilatation thermometer of, 25. 
N. 
Nahrwold on disintegration of platinum, 276. 
Natanson on molecular aggregation, 280. 
Navier on efflux from apertures, 242. 
on transpiration in short tubes, 285, 289. 
New Haven, Conn., laboratory work at, 18. 
Newton, Sir Isaac, radiation pyrometry of, 43. 
Nichols, pyrometric work of, 23, 26. 
Nichols, E. L., radiation pyrometry of, 44. 
on expansion of platinum, 47. 
criticises resistance pyrometers, 51. 
Nomenclature used in viscosity, 256. 
O. 
Obermayer, thermo-electric work of, 50. 
on transpiration of gases, 241. 
temperature coefficient of viscosity of, 279, 
280. 
Oechsle, expansion pyrometer of, 26. 
Oxide coats on steel, 46. 
Oxyhydrogen blowpiiie, 177. 
Peclet, heat conduction pyrometry of, 43. 
Pelouze, treatise of, on pyrometry, 23. 
Perkin, resistance of gases at high tempera- 
tures, 52. 
Pernolet, silicification of platinum, 187. 
Person, mercury pyrometer of, 27. 
Petersen, expansion pyrometer of, 26. 
air thermometer of. 28. 
Pfaundler, air thermometer stand of, 167. 
Photometric pyrometry, 43, 45. 
Pionchon, on specific heat of iron, 41. 
Plane of condensation, 108. 
of ebullition, 108. 
Platinum couples with vanishing amounts of 
impurity, 57. 
iridium couple, anomalies of, 115. 
thermo-electric datum for melting-point, 124. 
purified by heating, 126, 146. 
silicification of, 187. 
pervious to hydrogen, 264, 275, 283. 
disintegrates at high temperatures, 276. 
Plattner, fusion experiments of, 39. 
Poiseuille, law of transpiration of, 241. 
Poiseuille-Meyer, transpiration formulae, 240, 242, 
251. 
law not applicable, 284. 
Poison on transpiration in short tubes, 285. 
Porcelain, stem sagged into bulb, 22. 
air thermometer, standard form of, 22. 
coefficient of expansion of, 29. 
air thermometer, 31. 
expansion of, 31, 35, 36, 236. 
air thermometer bulbs, 171. 
machine for soldering, 175. 
Pouillet, pyrometric work of, 28. 
air thermometer of, 28. 
calorimetric pyrometry studied by, 41. 
thermo-electric pyrometry of, 48. 
Practical calibration, data for, 110. 
Pressure, effect of, on thermo-couples, 53. 
apparatus for transpiration work, 244. 
effect of, on transpiration in wide tubes, 295. 
Prinsep, pyrometric work of, 26. 
standard air thermometer of, 28. 
fusion pyrometer of, 39. 
Prinsep's alloys for fusion work, 34, 39. 
Problems to be undertaken, 17. 
De la Provostaye, radiation pyrometry discussed 
by, 44. 
Prussian porcelain works, apparatus of, 21. 
Puluj on viscosity and temperature, 241. 
temperature coefficient of viscosity of, 279, 
280. 
Purity of platinum, 146. 
Pyrognomic substanceSj 46. 
Pyrometer based on circulating water, 43. 
transpiration, forms of, 303. 
Pyrometers, classification of, 25. 
of fusible alloys, 39. 
limit of thermo-electric, 53. 
based on specific heat, 40. 
ebullition, 42. 
viscosity, 46. 
acoustics, 47. 
thermo-electrics, 48. 
electrical conductivity, 50. 
Pyrometry, advantages of thermo-electric, 52. 
interpolation methods in, 52: 
new viscous method of, computation for. 281. 
results for transpiration, 282. 
transpiration method of, practical remarks 
on, 302. 
Pyrometry based on heat conduction, 42. 
radiation, 43. 
Q. 
Quincke devises resistance pyrometer, 51. 
R. 
Radiation pyrometry, 28, 29. 43. 
Radius of capillary tubes, 257. 
how measured, 289. 
obtained by transpiration, 282. 
transpiration, measurement of, 255. 
Ramsay on transparency of metals, 164. 
Rayleigh, measures temperature coefficient of 
Latimer Clark's cell, 102. 
Reductions, thermo-electric, 67, 77. 
Re-entrant porcelain bulbs, 173. 
Regnault, standard air thermometer of, 28, 31, 
167, 248. 
measures expansion of gases, 33. 
displacement pyrometer of, 36. 
thermo-electric pyrometer of, 48. 
capillary tubes, 167, 169. 
Reissig, resistance pyrometer of, 51. 
Resistance, electrical, pyrometers based on, 50. 
of platinum alloys. 1 15, 1;;:;. 
Resistometer, 131. 
Reynolds, Osborne, on efflux through short 
tubes, 242. 
Richards, jet pumps of, 242. 
