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Figure 25. Main engine telegraph.Basically, <strong>the</strong> load program functions as an automatic interceptor preventingoverheating of <strong>the</strong> cylinder linings by limiting acceleration to a rate of one RPM per30 seconds. The desired RPM is set on <strong>the</strong> main engine telegraph or on <strong>the</strong> loadprogram display, and once <strong>the</strong> desired RPM has been reached <strong>the</strong> load program willmaintain it.In case of engine telegraph malfunction speed commands can be communicated to<strong>the</strong> engine control room via <strong>the</strong> emergency telegraph or via <strong>the</strong> closed circuitemergency telephone.Figure 26. From right to left: emergency telephone, emergency telegraph, and <strong>the</strong> display of <strong>the</strong> loadprogram.The emergency telegraph (at <strong>the</strong> center of figure 24) on <strong>the</strong> bridge is linked to asimilar display located in <strong>the</strong> engine control room. The back-lit buttons on <strong>the</strong>emergency telegraph represent speed settings (slow ahead, half ahead, slow astern,15