. The Ontario high school physics. f submarine bell,which sends out thesignals (Fig. 209), ishung from a tripod rest-ing at the bottom of thewater or is suspendedfrom a lightship or abuoy. The striking me-chanism is actuated by compressed airor electricity supplied from the shore orthe lightship. The receiving apparatus is carried by the ship. Two iron tanksare located in the bow of the vessel, one on each side (Fig. 210).These tanks are filled with salt water, and the ships outer skinforms one side of the tank. Suspended in eacii tank are two micro-phones (§537), which are connect
. The Ontario high school physics. f submarine bell,which sends out thesignals (Fig. 209), ishung from a tripod rest-ing at the bottom of thewater or is suspendedfrom a lightship or abuoy. The striking me-chanism is actuated by compressed airor electricity supplied from the shore orthe lightship. The receiving apparatus is carried by the ship. Two iron tanksare located in the bow of the vessel, one on each side (Fig. 210).These tanks are filled with salt water, and the ships outer skinforms one side of the tank. Suspended in eacii tank are two micro-phones (§537), which are connected to two telephone receivers up inthe pilot-house. The officer on placing these to his ears can hearsounds from a bell even when more than 15 miles away ; and bylistening alternately to the sounds from the two tanks he canaccurately locate the direction of the bell from him. Signal stationsare to be found on the shores of various countries, several beinglocated in the lower St. Lawrence and about the maritime provincesof Fio. 209. —Subma-rine bell, workedby compressed airsupplied from theshore. The mecha-nism for movingthe hammer of thebell is containedin the upper cham-ber. 11 . ^7 l:lt=q i? \\^^3 ^^ > A)^^*^^: J i \ \\\\\Hu *^\mlr — \ \^ ^\r—^ Fig. 210.—The sound from the bell isreceived by two tanks placed in theforepeak of the ship, one on eachside. The tank is filled with saltwater, and the ships outer skinforms one of its sides. In the waterare two microphones, which areconnected by wires A, A to two tele-phone receivers up in the pilot-house. 178 PRODUCTION, PROPAGATION, VELOCi;rY OF SOUND QUESTIONS AND PROBLEMS 1. Calculate the velocity of sound in air at 5°, 10°, 40° C. (See § 193.) 2. An air-wave travelled about the earth (diameter 8000 miles) in 36hours. Find the velocity in feet per second. 3. A thunder-clap is heard 5 seconds after the lightning flash was far away was the electrical discharge ? (Temperature, 15° C.) 4. The veloci
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