398 



Mr. T. Proctor Hall on New Methods of 



The error of setting calculated for this plate is + *13 dyne. 

 The angle of contact may therefore be considered zero for 

 glycerine and glass if time is allowed for attaining equi- 

 librium. 



(2) Platinum in glycerine. 



In the same liquid a platinum plate, 6*375 centim. long, 

 •0045 centim. thick, was touched to the surface and let stand 

 a few minutes. 



w. 



T cos 9. 



Temp. 0. 



•8234 



63-26 



160 



The error of setting is +'02 dyne, 



(3) Glass Plate in tap-water. 

 The same plate as in (1). 



w. 



T cos 6. 



Temp. C. 



•7585 

 •7581 

 •7583 



73-33 

 73-29 

 73-31 



o 



14-52 

 14-55 

 14-58 



T, by frame, =73'32 at 14°'41. 



(4) Platinum in tap-icater. 



The plate used in (2) in the liquid of (3). 



w. 



TcosG. 1 Temp.C. 



•8618 

 •9541 

 •9535 

 ■9538 



73-30 

 73-26 

 73-28 



o 



14-8 



The first weight was taken with the same precautions as 

 before to prevent dipping below the water-level. In the 

 other three cases the plate was dipped 1 millim. into the 

 water, to wet it. The correction for — o, 4 is +*06 dyne, 

 which makes the mean of the last three results 7 3' 34 dynes 

 at 14°*4. 



