An excellent sketch of his life and works, by the Rev. R. Harley, F.R.S., is to be found in the British Quarterly Review for July 1866, No. 87.
(W. S. J.)
BOOM, a word of Teutonic origin (cf. the Ger. Baum, tree, and the Eng. beam) for a pole, bar or barrier, used especially as a nautical term, for a long spar, used to extend a sail at the foot (main-boom, jib-boom, &c.). The “boom” of a cannon (note of a bell, cry of the bittern) is distinct from this, being onomatopoeic. In the sense of a barrier, a boom is generally formed of timber lashed together, or of chains, built across the mouth of a river or harbour as a means of defence. Possibly from the metaphor of a breaking boom, and the accompanying rush and roar, or from the rush of rising waters (mingled with the onomatopoeic use), “boom” began in America to be used of a sudden “spurt” or access of industrial activity, as in the phrase “a boom in cotton.” Hence the verb “to boom,” meaning to advertise or push into public favour.
BOOMERANG, a missile weapon of the Australian aborigines and other peoples. The word is taken from the native name used by a single tribe in New South Wales, and was mentioned in 1827 by Captain King as “the Port Jackson term” (Nav. Surv. Coasts Austral. i. 355) It has been erroneously connected with the womera or spear-thrower, and equally erroneously regarded as onomatopoeic—for it does not “boom” but whistles in the air. Two main types may be distinguished: (a) the return boomerang; (b) the non-return or war boomerang. Both types are found in most parts of Australia; the return form was, according to General Pitt-Rivers, used in ancient Egypt; and a weapon which has a close resemblance to the boomerang survives to the present day in North-East Africa, whence it has spread in allied forms made of metal (throwing knives). Among the Dravidians of South India is found a boomerang-shaped instrument which can be made to return. It is, however, still uncertain whether the so-called boomerangs of Egypt and India have any real resemblance to the Australian return boomerang. The Hopis (Moquis) of Arizona use a non-return form. The general form of both weapons is the same. They are sickle-shaped, and made of wood (in India of ivory or steel), so modelled that the thickness is about 1⁄6th of the breadth, which again is 1⁄12th of the length, the last varying from 6 in. to 3 or 4 ft. The return boomerang, which may have two straight arms at an angle of from 70° to 120°, but in Australia is always curved at an angle of 90° or more, is usually 2 to 3 ft. in length and weighs some 8 oz.; the arms have a skew, being twisted 2° or 3° from the plane running through the centre of the weapon, so that B and D (fig. 1) are above it, A and E below it; the ends AB and DE are also to some extent raised above the plane of the weapon at C; the cross section is asymmetrical, the upper side in the figure being convex, the lower flat or nearly so; this must be thrown with the right hand. The non-return boomerang has a skew in the opposite direction but is otherwise similar.
| Fig. 1. |
The peculiarity of the boomerang’s flight depends mainly on its skew. The return boomerang is held vertically, the concave side forward, and thrown in a plane parallel to the surface of the ground, as much rotation as possible being imparted to it. It travels straight for 30 yds. or more, with nearly vertical rotation; then it inclines to the left, lying over on the flat side and rising in the air; after describing a circle of 50 or more yards in diameter it returns to the thrower. Some observers state that it returns after striking the object; it is certainly possible to strike the ground without affecting the return. Throws of 100 yds. or more, before the leftward curve begins, can be accomplished by Australian natives, the weapon rising as much as 150 ft. in the air and circling five times before returning. The non-return type may also be made to return in a nearly straight line by throwing it at an angle of 45°, but normally it is thrown like the return type, and will then travel an immense distance. No accurate measurements of Australian throws are available, but an English throw of 180 yds. has been recorded, compared with the same thrower’s 70 yds. with the cricket ball.
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| Fig. 2.—Flight in Horizontal Plane. | Fig. 3.—Flight in Vertical Plane. |
The war boomerang in an expert’s hand is a deadly weapon, and the lighter hunting boomerang is also effective. The return boomerang is chiefly used as a plaything or for killing birds, and is often as dangerous to the thrower as to the object at which it is aimed.