Page:EB1911 - Volume 22.djvu/905

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RANDOM—RANGE-FINDER

or the primum mobile of tradesmen, a walking-burse or movable exchange, a Socratical citizen of the vast universe, or a peripatetics journeyman, that, like another Atlas, carries his heavenly shop on's shoulders.” He then proceeds to display his wares with a running satirical comment. The Jealous Lovers was presented by the students of Trinity College, Cambridge, before the king and queen in 1632. The Muse's Looking-Glass is hardly a drama. Roscius presents the extremes of virtue and vice in pairs, and last of all the “ golden mediocrity” who announces herself as the mother of all the virtues. Arnynlas, or The Impossible Dowry, a pastoral printed in 1638, with a number of miscellaneous Latin and English poems, completes the list of Randolph's authenticated work. Hey for Honesty, down with Knavery, a comedy, is doubtfully assigned to him.

His works were edited by W. C. Hazlitt in 1875.


RANDOM (older forms randon, randrun; from the French, cf. randir, to run quickly, impetuously; generally taken to be of Teutonic origin and connected with Ger. Rand, edge, brim, the idea being possibly of a brimming river), an adjective originally meaning impetuous, hasty, hence done without purpose or aim, haphazard. The term “random work ” is used, in architecture, by the rag-stone masons, for stones fitted together at random without any attempt at laying them in courses. “Random coursed work” is a like term applied to work coursed in horizontal beds, but the stones are of varying height, and fitted to one another (see MASONRY).


RANELAGH, formerly a popular resort by the Thames in Chelsea, London, England. About I6QO the land lying east of Chelsea Hospital, and bordering the river about the point where Chelsea Bridge now stands, was acquired by Richard, Viscount Ranelagh, later earl of Ranelagh (d. 1711). He built a mansion and laid out fine gardens, Which, in 1742, were thrown open as a proprietary place of entertainment. A building called the Rotunda was erected for concerts, and the gardens quickly became a favourite resort of fashionable society. Balls and masquerades, exhibitions of fireworks, regattas and many other forms of amusement were provided; but by the close of the 18th century Ranelagh was ceasing to attract the public, and in 1803 the Rotunda was closed. The buildings were removed, and the grounds became the property of Chelsea Hospital. They are still included in the pleasant gardens belonging to that foundation, but no traces of the popular Ranelagh are preserved. There is, however, a fashionable modern club of the same name.

See Warwick Wroth, London Pleasure Gardens of the Eighteenth Century (London, 1896).


RANGE-FINDER, TELEMETER or POSITION-FINDER (Fr. télémélre; Ger. Dislanzmesser; It. Telemetro; Russ. Dalnomier; Span. Telérnetro; in the United States the word-telemeter is sometimes applied to the stadia used in Connexion with the tachometer), an instrument, of which many varieties have been invented, for assisting the gunner and the infantry soldier in determining the distance or “range "1 to their objective. Nearly all range-finders may be described as instruments which automatically solve a triangle. Usually it is a right angled triangle, the length of the base of which is known, and one of the sides is the range it is desired to find. They are, in fact, goniometers, but the angle which they measure, whether it may be at the end of the measured base, or that subtended by it, is usually expressed as a function of the angle in terms of the measured base. Thus the range is recorded directly in metres or yards without calculation. It is proposed here

1 The word “ range, " from O.Fr. range, from ranger, to place in a row or rank (rang being a variant of ranc, whence Eng. 'rank ), meant properly a row or line of objects, as still in “ mountain range"; the secondary meanings of an area or space of ground, sphere of action, compass, extent, distance, are derived from the verb “ to range, ” to stretch out in a line, to extend, to move about over a given area.

to describe principally the range-finding instruments in the British services (1) as used in the lieet; (2) by the army in the field; (3) in harbour defence; and (4) to refer briefiy to range-finders, not under these heads, of English and foreign design.

1. The necessity for a range-finder afloat caused the British Admiralty in ISQI to issue an advertisement in the press inviting inventors to produce an instrument which would, amongst other conditions, record ranges with an accuracy of within 3% at 3000 yds. The resulting competition was declared in favour of a range-finder which is the joint invention of Professor Barr of the Glasgow University and Professor Stroud of the Yorkshire College.

The naval range-finder consists of a tube' which contains two telescopes. It is carried on a frame by bearings, in which the tube is free to revolve about its longer axis. To the frame B and is attached a weight capable of movement within a tank. Sfgud This weight balances the range-finder and frame upon knife-edges. By means of the handle on the left of the instrument and an altitude worm beneath it, the motion of the tube is governed, and the line of sight is directed on the objective. By partially filling the tank with water, the swinging of the weight in a seaway can be checked. The frame is supported on a pedestal and can rotate in azimuth upon it (fig. 1).

Fig. 1.—Barr and Stroud.

A rubber guard is fitted round the eye-pieces. Its functions are to guide the eyes of the observer into the correct position, and to protect them from side light and the distressing effect of wind. It also guards the forehead against the jar occasioned by firing heavy guns. The upper portion of the field presented to the left eye is used as a finder, the lower portion is occupied by the scale upon which the ranges are engraved. The finder is a low-power telescope of large field, to the centre of which the objective is brought. When the telescope is thus correctly aligned, the objective will be seen with the right eye largely magnified, but as two partial images separated by a thin black horizontal line. When coincidence of the images is effected by means of the working head, the range can be

1 The length of tube varies from 3 ft. in the smaller to 9 ft. in the larger instruments.