185 



MISCELLANEOUS TABLES 



THE object of these Tables is to afford the means of comparing the different deter- 

 minations of the hygrometrical elements which have been obtained, or adopted, bj 

 various physicists, especially the values of the elastic forces of vapor given in othe] 

 tables than those contained in the preceding pages. 



Table XVIII., giving the elastic forces of vapor, expressed in millimetres of mer- 

 cury, for Centigrade temperatures, was calculated by August from Dalton's experi- 

 ments, and reduced to French measures in the translation of Kaemtz's Meteorology 

 by Chas. Martins, page 70, from which it has been taken. On these values are basec 

 the first psychrometrical tables published by August, in Berlin, 1825. 



Table XIX. is the table computed by Kaemtz from his own experiments. It is 

 found, reduced to French measures, in the same volume, page 68. 



Table XX. furnishes the results of the experiments made by Professor Magnus, ir 

 Berlin, and published in PoggendorPs Annalen, Tom. LXI. p. 226, and also in the 

 Annales de Chimie et de Physique, 3 me serie, Tom. XII. p. 88, from which this table 

 was copied. 



Table XXI. has been published by the Committee of Physics and Meteorology ol 

 the Royal Society, in their Report on the Objects of Scientific Inquiry in thest 

 Sciences, London, 1840, p. 89. The values which it contains are not derived from 

 new experiments, but are probably computed from those existing at that time. 



Table XXII. furnishes a synoptic view of the differences in the values of the force 

 of vapor adopted by various authorities, prepared with the view of facilitating theii 

 comparison. A reference to their respective origin will be found below, page 152. 



Table XXIIL, showing the weight, in grammes, of the vapor contained in a cubic 

 metre of saturated air, at different temperatures, is taken from Pouillet's Elements de 

 Physique, Tom. II. p. 707. 



Table XXIV. gives the weights as derived from August's experiments, in Kaemtz's 

 Vorlesungen uber Meteorologie. The table is copied from the French translation, 

 by Martins, page 73. The tensions have been added, opposite the weights, and are 

 extracted from August's table. 



Table XXV. is found in Biot's Traite de Physique, Tom. I. p. 533. 



B 149 



