73 



5. In the case of thin frames the tension can be determined at once from the 

 maximum weight uncorrected, with results that varv less than do those obtained 

 by the method of capillary tubes. For example, compare Table II with Table 

 III, the latter giving selected results obtained by Quincke by the capillary tube 

 method. ' 



TABLE II. 



TABLE III. 



(TEMPERATURE 18^) 



6. As y and / are small, a small error in the assumed value of /' will not 

 appreciably affect the calculated value of T, Eq. (6). 



y being small, the film is much narrower than with a glass frame. There- 

 fore there is less temperature change due to evaporation from the film surface 

 and less absorption of gases and impurities from the air. 



^ Weiileiiiann's Annalen, No. 5, 1894, p. 14. 



