heavy fog cannotrender practically inefficient. True, it may be similarly as-serted that the varying conditions of the atmosphere exer-cise a potent influence on the transmission of sound, and thustend to decrease the value of the sound signal; but the factremains nevertheless that the latter… … GUSS1 SHAFT COUPLING, or three miles.and, under ordinary conditions of fog, consid-erably further. What the lighthouse is to the coast, thebuoy is to the hidden reef or shoal; but, unlike the for-mer, it is useless save by day. Moreover, while we havesupplemented the lighthouse by the stationary…
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