. Basic methods for the calibration of sonar equipment. CONTROL FOR POSITIONING TRANSDUCER TRANSDUCER. Fk;urf. 73. Sketcli of ollsct rolalor ami s\iuhro con- Irolled rotator ivith attaclimcnt lor lakint; diicctivity patterns of a transducer inside a ilome. 71 \ lew ol corrugated tlome on special rigging for directi\it\ nieasiiieinents. The types of carriages, suspension rods, and rotat- ors with synchro control arc identical with those at Mountain Lakes. Ihe carriage shown at the far end of the test basin in Figure 72 is especially designed for use in the rotation of de\ices around jjoi
. Basic methods for the calibration of sonar equipment. CONTROL FOR POSITIONING TRANSDUCER TRANSDUCER. Fk;urf. 73. Sketcli of ollsct rolalor ami s\iuhro con- Irolled rotator ivith attaclimcnt lor lakint; diicctivity patterns of a transducer inside a ilome. 71 \ lew ol corrugated tlome on special rigging for directi\it\ nieasiiieinents. The types of carriages, suspension rods, and rotat- ors with synchro control arc identical with those at Mountain Lakes. Ihe carriage shown at the far end of the test basin in Figure 72 is especially designed for use in the rotation of de\ices around jjoints other than the center ol gravity. This carriage and an offset rotator proved so useful that a synchro control was added. A further attachment was designed for taking vertical directi\â it^ jjatterns, such as that of an echo- sounding projector inside a dome. In this case, the dome is turned on its side, the projector mounted in- side at any desired bearing relative to the nf)se, and the two are then rotated together. These features are shown in Figines 7'^ and 74. The electric eciiiipmeiil lor the pier station is houseil inside the main building with the panels ar- ranged in an arc facing the lake, as shown in Figure 75. The operator is stationed between these panels and a desk for recording test data, and a window abo\e gi\es a view of the pier. The electric apparatus is similar to that at Moimtain Lakes with the excep- tion of the recorder and the high-])ower amplifier shown in Hgtue 78. Operation and circuit of the recorder have been descrilx'd in Section In this case, the drive by a doul)le-armature motor is replaced by a magnetic clinch which makes contact between the rails of the ])en (arriage and either side of a (oniiiuiously re\()I\ ing disk. Cooidiuaiion of the oscillator and the paper dri\e is obtained by dri\ ing both b)' one motor. The bay on the extreme left of. Please note that these images are extracted from scanned page images that may have been dig
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