Patent GB-107823-A (GB)
Title: Improvements relating to Engine Room Telegraphs.
Inventor: RAY JOHN WILLIAM
IPC: G08B9/06
Filed: 1916-07-15
Abstract: 107,823. Ray, J. W. July 15, 1916. Revolution-direction indicators.-In ships' engine-room telegraphs, means are provided whereby a revolution-direction indicator of the kind described in Specification 7135/14 showing two sets of differently coloured lights is combined with switch devices on the engine-room telegraph, the engine control gear, and a rotating switch driven by the propeller shaft so that when the reversing- shaft is set in agreement with the order a light of one colour e.g. white, will be exhibited and will appear to rotate whereas a light of a different colour, e.g. red, will be shown when the order is not complied with. In the device diagrammatically represented in Fig. 1<A>, the revolution-direction indicator A, preferably forming one of a series, is provided with four sets of white and red lamps W, R and is actuated from the enginedriven multiple-contact switch B provided with a contact arm Bt moving over four contacts b<1> and a common contact plate B<c> connected to the negative lead m. In each series of lamps W, R, one set of terminals is connected to the corresponding contact b<1> by leads L and the other set is separately connected to contact rings r<1>, w<1> in circuit with segmental plates Cr, Cw of a contact device C, the switch Ct of which is coupled to the reversing-shaft D. The engine contact device C is provided also with contacts C<a>, Cn, Cs corresponding with and connected to the ahead, astern, and stop contact plates Ea, En, Es of the engineroom telegraph E over which moves a switch Et carried by the pointer thereof. To the stop contact plate C
 are connected two contacts S<1>, S<2> arranged between the ahead and astern contacts C<a>, Cn. Near the central position of the switch Ct the part C<2> is wide enough to bridge the gap between the contacts C<a>, Cn but not that between the contacts E<x>, S<1>, S<2>. In the example shown, the telegraph Ep stands at an ahead order and the reversing-gear is in the same position, the circuit being P, E<c>, E<t>, E<a>, a, C<a>, C<w>, W, L, b<1>, B<t>, B<c>, m, N. If the engine is stationary, the illuminated white lamp shows that the control gear is set in accordance with the order, and when the propeller shaft rotates, the white lamps are illuminated successively, thus producing an impression of rotation ahead. Should the telegraph be moved to an astern order and the reversing-gear be left in the position shown, the circuit En, C<n>, C<2>, Cr of the red .lamps would be completed and the light would appear to rotate. In order to avoid the faint illumination of all the lamps which occurs in the arrangement shown in Fig. 1<A>, the common leads L are replaced by separate leads for the lamps. In a modification of the revolution-direction indicator, the dial face is provided with two annular windows Aw, Ar. Fig. 5, the two sets of lights being separated. White lights may be used throughout, one of the windows being coloured and adapted to show " wrong order " when illuminated. In the modification shown diagrammatically in Fig. 6, one or more pairs of red and white lights R, Ware mounted on a shaft G driven by gearing from the engine shaft and brushes Hr and Hw of the red and white lamps respectively are connected by rings Gr, Gw, G<c> to the telegraph and contact devices C, the action being similar to that described above.