Palmer — Pressure Coefficient of Mercury Resistance. 7 



were made in order that the irregularities in temperature, due 

 to compression, might become equalized and the distribution 

 of pressure throughout the whole apparatus become uniform. 

 It was also possible by this method to determine whether the 

 rate of leakage was sufficient to seriously affect the results and 

 when this was found to be the case to adopt means to prevent 

 it. The observations at 9° C. are given, in the order in which 

 they were taken, in table I, and those at 100° C. in table II, 

 where the columns P and R contain respectively the pressure 

 in atmospheres and the corresponding corrected resistances in 

 ohms. The chart, fig. 1, shows the same data graphically, the 

 horizontal scale being one hundred atmospheres and the verti- 

 cal one-tenth ohm per division. The base line corresponds to 

 11*6 ohms and the temperature at which each series was made 

 is marked above it. 



Table II. 



p 



R 



R' 



R-B/ 



P 



R 



R' 



R-R' 



88 



13-388 



13-360 



•028 



1521 



12-711 



12-714 



— •003 



161 



13-348 



13-327 



•021 



1600 



12-685 



12-678 



•007 



239 



13-310 



13-292 



•018 



1690 



12-644 



12-638 



•006 



325 



13-257 



13-253 



•004 



1788 



12-603 



12-594 



•009 



407 



13-227 



13-216 



•011 



1895 



12-573 



12545 



•028 



471 



13-204 



13-188 



•016 



1969 



12-518 



12-512 



•006 



531 



13-177 



13-160 



•017 



2139 



12-459 



12-435 



•024 



572 



13-156 



13142 



•014 



2214 



12-430 



12-401 



•029 



647 



13-125 



13-108 



•017 



59 



13-378 



13-373 



•005 



697 



13-103 



13-086 



•017 



210 



13-299 



13-305 



— •006 



739 



13-069 



13-067 



•002 



316 



13-246 



13-257 



— •on 



801 



13-030 



13-039 



— •009 



420 



13-207 



13-211 



— •004 



862 



13-014 



13-011 



•003 



513 



13-148 



13-168 



-•020 



904 



12-982 



12'992 



— •010 



596 



13-114 



13-131 



— •017 



947 



12-974 



12-973 



•001 



713 



13-047 



13-078 



— •031 



1008 



12931 



12-945 



— •014 



834 



13-004 



13-024 



— •020 



1053 



12-920 



12-925 



--•005 



955 



12-939 



12-969 



— •030 



1156 



12-865 



12-878 



— •013 



1067 



12-898 



12-919 



— •021 



1235 



12-830 



12-843 



— •013 



1199 



12845 



12-859 



— •014 



1293 



12-824 



12-817 



•007 



1324 



12-800 



12-803 



— •003 



1306 



12-797 



12-81-1 



-•014 



1441 



12-721 



12*750 



— •029 



1400 



12-762 



12-768 



— •006 



1599 



12-684 



12-679 



•005 



1468 



12-743 



12-738 



•005 



1741 



12-616 



12*615 



•001 



1509 



12-724 



12-719 



•005 



1877 



12-574 



12-553 



•021 



1580 



12-693 



12-687 



•006 



2029 



12-476 



12-485 



-•009 



1652 



12-668 



12-655 



•013 



2113 



12-481 



12-447 



•034 



1705 



12-647 



12-631 



•016 



2236 



12-339 



12-392 



— •053 



1719 



12-625 



12-625 



•000 



1838 



12-567 



12-571 



— •004 



9 



' 13-394 



13-396 



— •002 



1409 



12-746 



12-764 



— •018 



1292 



12-834 



12-817 



•017 



1023" 



12908 



12-938 



— •030 



1368 



12-763 



12-783 



— •020 



587 



13-107 



13-135 



— •028 



1452 



12-733 



12-745 



— •012 



103 



13-401 



13354 



•047 



