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<br />16 <br /> <br />TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS <br /> <br /> <br />~. <br /> <br />~' , <br />-." <br /> <br />--.;...,Jt <br />.... c.t J:. <br />..., I,,::. ~ <br /> <br />Figure 22.-8-56 reel. <br /> <br />.- <br />, <br /> <br /> <br />- <br /> <br />Figure 23.-E-Sl reel. <br /> <br />from cfJ.ble cm's, but this is not recommended <br />because of the disadvant<.ges mentioned above. <br />Two types of handline reels are the Lee-Au <br />,md the :>'lol'gall. (See fig. 2R.) <br />Ellsworth cable is recommended for handlines <br />be,,,,,use of its flexibility aud dumbility. <br /> <br />The pressed-sleeve connector or the Au con- <br />nector are used on handlines because they are <br />lighter in weight than the type-B connector, yet <br />strong enough for the sounding weights used <br />with handlines. <br />Figure 29 shows a handline in use from a <br />bridge. <br /> <br />Sonic sounder <br />A commercial, compact, portable sonic sound- <br />er has been adapted to measure stream depth. <br />(See figs. 30, 31, and 32.) <br />The sounder is powered by either a 6- or 12- <br />volt storage battery and will operate continu- <br />ously for 10 hours on a single battery charge. <br />Three recording speeds are available, 36, 90, or <br />180 inches per hour. Four operating ranges, <br />0-60, 60-120, 120-180, and 180-240 feet allow <br />intervals of 60 feet of depth. The sounder is <br />portable, weighing only 46 pounds. The depth <br /> <br />f <br />