| 释义 |
Fathometer|fæˈðɒmɪtə(r)|
Also fathometer.
[f. fathom + -meter.]
An instrument for the determination of the depth of the sea by measuring the time taken by a sound-wave to reach the bottom and return.
1925Hydrographic Rev. II. ii. 140 (heading) The ‘Fathometer’ of the Submarine Signal Co. of Boston. This apparatus, also based on the same principle as that of Fessenden, differs..by the particular feature only, viz. the angle to be measured is observed by means of a lighted index..which is illuminated when it receives the reflected acoustic signal. 1927S. H. Long Navigational Wireless xi. 149 Another method of determining the sounding of a ship consists of a piece of apparatus..called the ‘Fathometer’. This instrument is based on the principle of emitting a sound wave from a sound transmitter, casuing this wave to be reflected from the sea⁓bed, and receiving the reflected sound wave on a receiver. 1937Geogr. Jrnl. XC. 543 Her echo-sounding device (known in the U.S.A. as the Fathometer). 1971Islander (Victoria, B.C.) 14 Mar. 10/3 The speedometer and log was helpful in establishing position and the fathometer very useful when entering an unfamiliar anchorage. |