A Sensitive Water-Level Tiltmeter

D. R. Bower
1973 Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences  
A sensitivity approximately equal to that of a horizontal pedulum is obtained in a 50 m long water-level tiltmeter. A crapaudine-type calibrating device is described.
doi:10.1098/rsta.1973.0046 fatcat:rnj7sz2m7rhk3eutqllsqsh3ee