The crow's nest is an apparatus placed on the main-top-mast, or top-gallant-mast head, as a watch tower for the officer on the lookout. It is closely defended from the wind and cold, and is furnished with a speaking trumpet, a telescope and rifle. The most favorable opportunity for prosecuting the fishery in the Greenland seas, commonly occurs with north, north-west or west winds. At such times the sea is smooth, and the atmosphere, though cloudy and dark, is generally free from fog and snow. The fishers prefer a cloudy to a clear sky; because in very bright weather, the sea becomes illuminated, and the shadows of the whale-boats are so deeply impressed in the water by the beams of the sun that the whales are apt to take the alarm. Fogs are only so far unfavorable as being liable to endanger the boats by shutting out the sight of the ship.--A well constructed whale-boat floats lightly and safely on the water,--is capable of being rowed with great speed, and readily turned round,--it is of such capacity that it carries six or seven men, seven or eight hundred weight of whale-lines, and various other materials, and yet retains the necessary properties of safety and speed. Whale-boats being very liable to receive damage, both from whales and ice, are always carver-built,--a structure which is easily repaired. The instruments of general use in the capture of the whale, are the harpoon and lance. There is, moreover, a kind of harpoon which is shot from a gun, but being difficult to adjust, it is seldom used. Each boat is likewise furnished with a "jack" or flag fastened to a pole, intended to be displayed as a signal whenever a whale is harpooned. The crew of a whale-ship are separated in divisions, equal in number to the number of the boats. Each division, consisting of a harpooner, a boat-steerer, and a line-manager, together with three or four rowers, constitutes a "boats crew."
On fishing stations, when the weather is such as to render the fishery practicable, the boats are always ready for instant service. The crow's nest is generally occupied by one of the officers, who keeps an anxious watch for the appearance of a whale. The moment that a fish is seen, he gives notice to the "watch upon deck," part of whom leap into a boat, are lowered down, and push off towards the place. If the fish be large, a second boat is despatched to the support of the other; and when the whole of the boats are sent out, the ship is said to have "a loose fall." There are several rules observed in approaching a whale to prevent the animal from taking the alarm. As the whale is dull of hearing, but quick of sight, the boat-steerer always endeavors to get behind it; and, in accomplishing this, he is sometimes justified in taking a circuitous rout. In calm weather, where guns are not used, the greatest caution is necessary before a whale can be reached; smooth careful rowing is always requisite, and sometimes sculling is practiced. It is a primary consideration with the harpooner, always to place his boat as near as possible to the spot in which he expects the fish to rise, and he conceives himself successful in the attempt when the fish "comes up within a start," that is, within the distance of about two hundred yards.