304 PROCEEDINGS OP THE AMERICAN ACADEMY 



• _ _, Diff. in Length 



Time. Thermometers. iu D Wigi rJ of 



h. m. No. 1. No. 2. Micrometer. 



1880, Mar. 23, 9 7 a.m. 9.9 — +62.9 



10 47 11.6 — -j-19.4 



7 58 p.m. 19.0 — —86.5 



8 1 19.1 — —81.8 

 Mar. 24, 6 44 a.m. 17.5 — —147.2 



7 51 17.2 — —150.4 



8 54 17.2 — —149.9 

 8 57 17.2 — —151.8 



Series II. 



„ _,, Diff. in Length 



Time. Thermometers. in Divisions of 



h. m. No. 1. No. 2. Micrometer. 



1880, April 11, 4 33 p.m. 47.7 51.1 —297.3 



4 35 47.7 — —296.5 



4 37 47.7 50.8 —295.0 



Shut off heat, and opened windows. 



4 43 — — —288.1 



4 47 46.8 23.0 —327.0 



4 49 45.0 19.2 —420.3 



4 52 44.4 19.1 —464.1 



4 55 43.8 18.9 —535.7 



4 59 42.8 19.0 —580.7 



5 1 41.0 19.0 —638.1 

 5 5 40.2 19.0 —669.5 

 5 9 — — —702.1 

 5 10 — — —707.7 

 5 13 38.3 20.0 —716.0 

 5 27 36.0 21.0 —742.5 

 5 32 — — —746.7 

 5 36 34.0 20.3 —741.2 

 5 41 — — —730.7 



5 46 33.6 19.2 —694.5 

 7 35 24.1 17.8 —497.1 



10 5 8.2 4.4 —453.9 

 April 12. Windows open all night. 



6 46 a.m. 1.2 1.3 —374.3 



7 18 2.7 1.1 —369.6 



8 7 1.8 1.7 —363.9 

 2 34 p.m. 4.6 6.2 — 311.G 



