A SUMMARY OF METEOROLOGICAL RECORDS. 



Location and Equipment. 



The meteorological observatory is located in the tower at the 

 southeast corner of South College, at an elevation of about 50 

 feet above the ground. It was equipped with a number of 

 Draper self-recording instruments, and the records date from 

 Jan. 1, 1889. The location is on a gravel ridge with an open 

 exposure to the north, west and southwest, with slightly higher 

 ground about a mile to the south and a ridge considerably 

 higher about half a mile to the east. 



The top of the tower is 72 feet above the ground, and the ex- 

 posure is good in all directions. The anemometer, anemoscope, 

 wind-pressure instrument and electrical sunshine recorder are 

 mounted from 3 to 5 feet above the top of the tower, and the 

 recording apparatus is in the room below. The thermometer 

 shelter and rain gauges are on the campus about 300 feet 

 southwest from the tower and on slightly lower ground. 



The observatory is in latitude 42° 23' 48.5" N., longitude 

 72° 31' 10" W., and the base of the tower is 223 feet above 

 mean low water, Boston harbor, as determined by levels con- 

 necting with those of the Boston & Maine Railroad. The 

 standard barometer is of United States Weather Bureau pattern, 

 reading to ^/ooo of an inch, and the cistern is 2733^ feet above 

 sea level. The Draper self-recording barometer is mounted 1 

 foot higher. 



The sunshine recorder of the Draper pattern was replaced by 

 an electrical one from Friez in 1906, and the Draper anemom- 

 eter by one of United States Weather Bureau pattern at about 

 the same time. These records are received on a triple register, 

 which also records the rainfall. The rain gauges are about 2 

 feet above ground and 218 feet above sea level. A United 

 States Weather Bureau gauge is used in determining the pre- 



