39 



Prof. Kendall (the instruments of the High School being dismount- 

 ed) used the Plosel telescope belonging to the Society. 



Prof. Frazer used the Dollond telescope belonging to the Univer- 

 sity; 3f inches object glass; 5 feet focus; screen glasses of various 

 shades of red; generally a very dark red preferred. 



The following table gives the observed times of contact by the va- 

 rious observers. 



The observatory of Mr. Longstreth at the Friends' School House 

 in Cherry street, is in lat. 39° 57' 16", long. 5h. 00m. 395. W., being 

 400 feet east of the State House, and about 1800 feet north of it. 

 Mr. Wagner's observatory is in the same "latitude as the State House, 

 39° 56' 59", and in longitude about 0.77 sec. west of the old High 

 School observatory : thus making 7m. 32.86 east of Washington. 



Mr. Bean's observatory at Norristown is in lat. 40° 07' N. and 

 long. 7 '.75 east. 



Mr. Jackson's observatory at the Sharon Female Seminary near 

 Darby, is in latitude 39° 54' 14" N., longitude 5h. Im. 6s. west from 

 Greenwich. 



The observations were made with a nine feet equatorial, by Merz 

 and Mahler, of Munich; power used, 65. 



The meteorological phenomena are submitted as recorded by the 

 different observers ; they are not comparable, for want of determina- 

 tion of the error of the instruments. 



The results of Prof. Frazer alone are reduced — the height of the 



o 



barometer to that of the standard of the Smithsonian Institution 

 (Ernst 5); the thermometers to that of a standard thermometer made 

 and compared at the Kew observatory, England. 



Observations by Mr. Longstreth. 



Height of barometer at 2/t. 20m. = 30.01 in. therm, att. 76° Fah. 



7h. = 30.04 „ 73° „ 



Mason's hygronrieter exposed to the sun. 



