Oct,., 1955
THERMODYNAMIC PROPERTIES O F SURFACES
Acknowledgments.-Grateful appreciation is expressed for support of this project by the Office of Ordtinncc: Research, U. S. Army. The gift of
O F THE
n-L4LICANESERIES
1019
materials and technical information from the Nylon Research Division, E. I. du Pont de Nemoiirs and Co., is also acknowledged.
THE ISOBARIC SURFACE TENSIONS AND THERMODYNAMIC PROPERTIES OF THE SURFACES OF A SERIES OF YL-~~LIC~N C,E STO , Cis, I-A4LIor\ritlidmnn 11s the ternpri~ntriw condition required. To mnitit,nin a constant, tctnpri~:Lturt. urements, n specinlly designed :Lnd m i l stJructed glass-wool insulntecl wnt,ei,-liatli was iised \vliirli was equipped with non-rlistort,ing heat resistnnt pl:ttfs ~ 1 : ~ s . : windows. Effirient st,irring \vas nccomplishctl \ v i l l i n turbine stirrer, and the t,empei,nt,urevnrintioii \vas no grmtei, than 0.08" u p to the boiling point of witel,. Trmpeixtui,es were measured wit11 a hTBS rPr~tifietl Leetls and Nort1ii.u 1 resistance thermomet,er risrtl i i i conjunction with :I NE& certified C-2 RIurller Iiiidgr macle I)y t,he satiic ronipnnv. The galvanomcAtrr used ill the I)i.itlge circuit, was :in FTS (3) J. .T. Jasper and I
