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Engine Order Telegraph
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Ship  Control  Console
Figure 2-9.— Propeller order indicator-transmitter. indicator-transmitter. See figure 2-9. It is commonly called the engine revolution telegraph. This instrument enables the lee helmsman to make minor changes in speed by stepping up or lowering the rpm. On the face of the instrument are three small windows, in each of which appear two rows of numbers. The lower row of numbers is set individually by the three hand knobs located directly below the windows. These lower numbers  give  a  visual  indication  of  shaft  revolution ordered by the conning officer to the engineroom. Corresponding  numbers  appear  on  a  similar  instrument in   the   engineroom(s)   by   means   of   electrical transmission. In the engineroom(s), these orders are received and acknowledged when the engineroom instrument is set on the same settings. Once again, this indication is transmitted back to the bridge electrically and is shown as the upper row of numbers. Thus, the operator at the conning station is able to report to the conning officer the receipt of the order for engine speed and that it is being carried out. During the many different conditions of steaming, individual  commands  usually  establish  orders  regarding when and in what manner the engine order telegraph and engine  revolution  telegraph  are  used  together  or separately. Usually it is found that the engine order telegraph is used alone during periods of piloting, whereas  during  periods  of  normal  steaming,  the  engine revolution telegraph may be the primary means of transmitting speed changes. In general, however, both means are used when steaming under normal conditions. Be sure you know the exact orders relating to their use before taking over a watch on the bridge. The number of revolutions per minute required to travel at the various speeds (full, standard, 2/3, and so on) are calculated in advance and are posted on a table nearby. Figure  2-10.—  Engine  revolution  indicator. 2-8

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