Sound-signals ... |
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aberrations appears approaching ascertain atmosphere audibility audition Beaver Tail bell blast bulb buoy cause charge circumstances clear close coast condition continued course Daboll diagram differences direction distance Duane effect engineer established expect experiments fact failed faintly farther favorable feet five fog-signal force four given going Gull island half head hear heard Henry hour inaudible inches increased instance intensity interval island land later light Lighthouse Board Little Gull lost lower mariner miles minute noted observations officers operation passed phenomena pounds practical pressure produced Prof range reached refraction result ROCK rocket says seems Service showed signal siren sound sound-waves sounds moving station steam steamer suggested surface taken temperature tion Trinity House trumpet tube Tyndall United upper upward various vessel waves weather whistle whistling-buoy wind