386 Mr. T. Proctor Hall on New Methods of 



Surface-Tension of Water, by capillary tubes. 



T. 



Tat 



0°C. 



74-4 at 0° C. 



74-4 



752 --1405*. 



75-2 



740 at 8° -5. 



75-2 



75-0 at 0°. 



7.r0 



75-4 — 141 if. 



75-4 



75 6 -146 £ 



756 



74-2 at 8°-5. 



75-4 



73-7 at 11°. 



75-2 



73-1 at 10°. 



745 



771 -\L79*. 



77-1 



710 at 19°25. 



73-7 



71 Oat 16°-2. 



73-3 



72-lbetw.l5°&20°. 



? 



71-8 at 17°5. 



743 



79-7 --20±t. 



79-7 



754 --144*. 



75-4 



71-3 at 16°"2. 



736 



75-8 -143 1. 



75-8 



76-5 — -144 ?f. 



7Cv5 



77-3 --1406*. 



773 



54-9. 



? 



Mean 



75-4 





Observer. 



Artur. 

 B runner. 

 Desain. 

 Fran ken heim. 

 Frankenheim. 

 Frankenheim 

 &• Sondhauss. 



v Gay-Lussac. 



Hagen. 

 Jager. 



Magie. 

 Quincke. 



Quincke. 



Kodenback. 



Simon. 



Soudhau?s. 



Volkmann. 



Volkinann. 



Wolf. 



Wolf. 



Wertheim. 



Beference. 



Theorie elementaire de la capillarite. 

 Pogg. Ann. lxx. p. 481 (1847). 

 Ann. Chim. Phys. li. p. 383 (1857). 

 Pogg. Ann, xxx vii. p. 409 (1836). 

 Pogg. Ann. lxxii. p. 177 (1847). 

 Journ. Pr. Chem. xxiii. p. 401 (1841). 



/ Poisson, Nouvelle Theorie etc. pp. 

 1 112, 181 (1831). 

 Pogg. Ann. lxvii. pp. 1, 152 (1846). 

 Beibl. xvi. p. 345 (1892); Wiener 



Ber. pp. 99 & 100 (1891). 

 Wied. Ann. xxv. p. 432 (1885). . 

 Pogg. Ann. cxxxix. p. 1 (1870) ; Phil. 



Mag. April 1871, p. 252. 

 Pogg. Ann. clx. p. 371 (1877). 

 Beibl. iv. p. 105 (1880). 

 Ann. Chim. Phys. xxxii. p. 5 (1851). 

 Pogg. Ann, Erg. viii. 1878, p. 266. 

 Wied. Ann. xi. p. 177 (1880V 

 Wied. Ann. xvii. p. 361 (1882). 

 Pogg. Ann. cii. p. 571 (1857). 

 Ann. Chim. Phys. xlix. p. 269(1857). 

 Pogg. Ann. cii. p. 598 (1857). 



Capillary plates have been used by a few investigators in 

 place of capillary tubes, with no apparent advantage. Volk- 

 mann* found for water at 16° C, T = 71*8 dynes (74 at zero), 

 while Wertheim | and Hagen J obtained values approaching 

 50 dynes. 



Wertheim § and Hagen || obtained equally low values by 

 measuring the capillary elevation of water at a single vertical 

 plane wall. Quincke IF, neglecting the curvature in glass 

 bottles 50 millim. in diameter, deduced from the capillary 

 elevation of water in them T = 86*2 dynes at zero. This 

 method is obviously of no practical value. 



In all of these three methods it is assumed that when the 

 solid wall is wet by the liquid the angle of contact is zero. 

 The validity of this assumption has been questioned by 

 Quincke, who maintains** the actual existence of a finite 



* Wied. Ann. xi. p. 177 (1880). 



t Pogg-. Ann. cii. p. 595 (1857). . % Ibid, lxxvii. p. 453 (1849). 



§ Ibid. cii. p. 595 (1857). || Ibid, lxvii. pp. 1, 153 (1846). 



5l Ibid, cxxxv. p. 641 (1868), and Phil. Mag. August 1869, p. 95. 

 ** Quincke, W 7 ied. Ann. xxvii. p. 219 (1886). 



