Preventing Collisions with Icebergs

Abstract

ALTHOUGH it is, I believe, ascertained that fogs are often highly athermanous, I would, at the same time, like to ask whether a thermal radiation method might not serve to show the presence of a large mass of ice in the neighbourhood of a ship. I venture to make the suggestion, as I know of no experiments on the degree of athermancy possessed by fogs, as tested by such an instrument as the bolometer of Prof. Langley. The use of this instrument, or even of the thermopile, in conjunction with a large reflector and an alarm circuit closed by galvanometer deflection, might be worth trial by any one possessing the opportunity.