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PRACTICE OF LEVELLING
to any observed temperature between 214° and 180°
85 write C at top of tower, and state as follows, viz. In triangle CDB 81,49+40=121.49, and 81.49—40-41.49; then 121.49: 41.49 :: tan, C+B=69° 3': tan. C-B-42° 24'; then to find BC 69° 30'-42° 24'}= 270 5′-angle C, sin. 27° 5' : 40 :: 41°: CB=57.62.
Page 208. Belfast. There have been two reservoirs, for supplying the wealthier inhabitants with water, for a considerable time past. New waterworks are in progress of execution, for supplying the town with excellent water from the Cave Hill.
Page 209. Dublin. There is a second basin on the south side, which receives its water from the river Dodder, and which supplies a part of the city of Dublin with water.