We put the world before you by means of the Bioscope and Urban films (Nov 1903)

183 lanternist who moves from place to place, and consequently encounters electric supply systems of varying voltages the resistance should be variable, in older to reduce the voltage and adjust it to exactly the required extent. Further than that, it is found of great advantage to be able to control the intensity of the light to suit the particular work which the lantern or cinematograph is called upon to perform. The Rheostat under consideration has been specially designed for the use of lanternists, and is particularly light and portable, while combining in the one instrument all the advantages which can usually only be secured by means of various accessories. In this instrument the current resisting wire, which converts the surplus voltage into heat, is strung in a number of spirals from end to end of a light iron frame. The lugs to which these wires are attached are mounted on slate insulators at top and bottom, and are connected with the contact "buttons" by strips of heavy copper. The mere movement of the switch over this contact varies the length of wire through which the current must pass on its way to the lamp, and, consequently, alters the voltage and varies the intensity of the light according to the operator's wishes. The arrangement of these wires is such that cooling currents of air circulate freely between and around them, so that the instrument never becomes unduly heated The regulating lever acts as a switch for cutting off the current, and there is fitted also a " cut-out " for the insertion of a fuse. It is a light and thoroughly well-made Rheostat, and is a wonderfully convenient instrument for the purposes for which it was designed. 250 VOLT RHEOSTAT.-A recent type of an efficent Rheostat designed especially for the cinematograph 9xhibitor who requires a reliable resistance coil to suit all currents and voltages (from 50 to 200 volts direct current to 70 amperes, and from 50 to 250 volts alternating current to 100 amperes. Built of Kruppine wire coils, mounted on a square upright iron ventilating frame with insulated slate top, copper contact lugs and brass lever adjustment with metal hinged cover to set and lock over top when travelling or not in use. SPECIFIC A TION. Strong iron frame, fitted with enamelled slate slabs. Spirals of special alloy, which does not become brittle, spaced apart to prevent accidental short-circuiting, and of ample section to avoid the overheating which commonly occurs in cheaply-made resistances. Pattern C has 20, and D 28 spirals, connected two in parallel. The switch is substantial, and fitted with adjustment to take up wear, and has six contacts in C, and eight in D, and an "off" position; fuse-terminals are provided. The iron frames are stove-enamelled and picked out in gold, the aluminium pattern being left bright. Lugs are drilled for screwing to wall. 250 Volt. Rheostat. STOCK PATTERNS. C, for any Supply Circuit from 60 to 100 volts. Amperes. Resistance. Iron frame. Aluminium. List No. Price. List No. Price. & s. d. £ 8. d. 8 to 15 1'2 to 6 ohms. 21 2 5 O 31 2 10 O 16 „ 35 .6 „ 3 „ 22 2 10 0 32 2 15 O 25 „ 45 •36 „ 1.8 „ 23 3 O O 33 3 5 O 36 „ 65 •24 ,, 15 „ 24 3 5 0 34 3 10 0 Overall Sines, 18 by 15 by 5 inches. Approximate Weights : Iron Frame, 19 to 25 lbs.; Aluminium Frame, 14 to 20 lbs.