OCR Text |
Show To Measnre the Sea Level. A new appaxaius for meawrrimr thu nron level of tho sea has lately been installed in-stalled at M.vrseilles. It is kused on tho principle that whou a liquid wavo trav-erwa trav-erwa a cjipiUary tnbo or a porous partition, parti-tion, its amplitudo diminishes and it ia retarded in its ph;v.st without tho mean level of tho wavo changing. It coiihihti of a giatjH tube, tha lowiir cud of which communicates by a flexible pipe with a plunger which is lowered beneath the lowest water IbtcI. There are two cells in tho plunger, the lower being filled with sand and open to tho Boa, tho result being that tho column of water in tho tube rises and faJlw very little with the tides, and the mean sea levf 1 can be read from a graduated scale. New York Times. ! |