OF ARTS AND SCIENCES. 



383 



And finally, 



At 160.67 C. 



or. 



R,^'- + 0.2 ii 



i?2"= 4- .000008 in. 



For R^'^ we have, since 



or. 





R^'- _ .000056 in. 



Y 

 T 



:+1.6/* 



Y 

 Y 



COMPARISON OF METERS R^'-, G^'^, AND (7/2, WITH UNIVERSAL 



COMPARATOR. 



Date. 



1883. 



(Objective = 1 inch. 1 div. = .440 yti.) 

 Equations of Condition. 



Jan. 



9 



" 9 



" 10 



" 11 



" 12 



" 12 



" 12 



" 12 



7?,>2 — Gi'3 



— 15. 7 div. 

 —14.6 div. 

 —48.9 div. 

 —35.2 div. 



—66.0 div. 

 —51.6 div. 

 —53.0 div. 

 —49.9 div. 



" 14 +20.4 div. 

 " 19 +32.7 div. 

 " 21 +18.1 div. 



Jan. 14 +33.4 div. 



" 15 +31.4 div. 



" 17 +48.7 div. 



" 17 +57.6 div. 



" 17 +56 .3 div. 



" 18 +38.3 div. 



" 18 +51.0 div. 



July 6 +51.0 div. 



" 8 +66.1 div. 



" 8 +02.6 div. 



" 9 +56.5 div. 



" 9 +56.5 div. 



At 0° C. 

 b = +4.5 div. 



jr?i»2 — G/2 (t — 0)° i?i*2 ■ 



— 4.6 div. = a +8.506 (—53.9) div. (—42.8) div. 



—15.1 div. = a +6.046 (—41.9) div. (—42.4) div. 



—46.9 div. = a —4.046 —30.7 div. —28.7 div. 



—29.0 div. = a —1.386 —29.0 div. —22.8 div. 



—62.9 div. = a —7.666 —31.5 div. —28.4 div. 



—51.2 div. = a —7.706 (—16.0) div. (—15.6) div. 



—58.4 div. = a —7.566 (—19.0) div. —24.4 div. 



—48.2 div. = a —4.536 —29.5 div. —27.8 div. 



+17.6 div. = a +11.786 —32.6 div. —35.4 div. 



+33.2 div. = a +13.826 —29.5 div. —29.0 div. 



+21.4 div. = a +11.856 —35.2 div. —31.9 div. 



At 16°.67 C. 



+35.5 div. 



+26.5 div. 

 +58.9 div. 

 +65.7 div. 



+66.4 div. 

 +43.9 div. 

 +52.3 div. 

 +54.0 div. 



+72.9 div. 

 +70.5 div. 

 +66.1 div. 

 +63.9 div. 



a +15.776 

 a +14.446 

 a +21.116 

 a +20.926 



a +20.586 



a +14.86 



a +18.92 



a +18.48 



a +21.72 

 a +20.78 

 a +20.25 

 a +19.95 



+37.4 div. 



+41.4 div. 



(+28.7) div. 



+38.5 div. 



+38.9 div. 

 +46.4 div. 

 +40.9 div. 

 +42.9 div. 



+43.4 div. 

 +44.1 div. 

 +40.4 div. 

 +41.7 div. 



+39.5 div. 

 +36.5 div. 

 +38.9 div. 

 +46.6 div. 



+48.8 div. 

 +52,0 div. 

 +42.2 div. 

 +45.9 div. 



+50.2 div. 

 +52.0 div. 

 +50.0 div. 

 +49.1 div. 



