284 



TRANSACTIONS OF THE 



This table of comparisons will give a good idea of the various currents 

 of air throughout the city. The Signal Office being near the river (within 

 one block), its minimum should be a little higher, while Captain Foster's 

 is about fifteen blocks, or over a mile, northeast of the Signal Office, and 

 on the corner of a wide street, while Mr. Gerrish's place of residence and 

 observation are very nearly one mile northeast of the Signal Office, and 

 are situated in the middle of the block. 



COMPARISON OF RECORDS. 



