Hydrographical surveying : a description of means and methods employed in constructing marine charts (1920)
Wharton, W. J. L. (William James Lloyd), 1843-1905, Field, Arthur Mostyn, 1855- · London : J. Murray · leaf 443
e force of the blow is sufficient topress B down, thus bringing the jaws as close together aspossible, and putting the meter into action. The second mes-senger, falling on the fiist, opens the levers again, and prevents 414 HYDROGRAPHICAL SURVEYING [chap. xix. their closing, thus keeping all parts… … of the rudder fits into the notches on the outer ring of theframe when the machine is locked, and thus keeps the rudderfixed; but Avhen the first messenger has started the machineby pressing down B and opening the levers A A, this smalllever is raised, and the rudder can revolve freely. CHAP. XIX.]…
Hydrographic surveying · Nautical charts
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