he or she relinquishes command. Completed pages ofthe log, filed in a post-type binder, are numberedconsecutively. They begin with the first day of eachmonth and run through the last day of the month.When the commanding officer (or engineer officer)directs a change or addition to the Engineering Log, theperson directed must comply unless he or she believesthe proposed change or addition to be incorrect. In thatevent, the commanding officer or engineer officer willpersonally enter his or her comments and sign the log.After the log has been signed by the the commandingofficer, it may not be changed without his or herpermission or direction.Engineer’s Bell BookThe Engineer’s Bell Book, NAVSHIPS 3120/l, is arecord of all bells, signals, and other orders received bythe throttleman for movement of the ship’s propellers.Entries are made in the Bell Book by the throttleman (oran assistant) as soon as an order is received. Entries areusually made by the assistant when the ship is enteringor leaving port, or engaging in any maneuver that islikely to involve numerous or rapid speed changes. Thisprocedure allows the throttleman to devote his or herundivided attention to answering the signals.The Bell Book is maintained in the followingmanner:1. A separate bell sheet is used for each shaft eachday, except where more than one shaft is controlled bythe same throttle station. In that case, the same bell sheetis used to record the orders for all shafts controlled bythe station. All sheets for the same date are filed togetheras a single record.2. The time of receipt of the order is recorded incolumn number 1.3. The order received is recorded in columnnumber 2. Minor speed changes (generally received viarevolution indicator) are recorded by entering thenumber of rpm ordered. Major speed changes (normallyreceived via engine order telegraph) are recorded usingthe following symbols:a. 1/3-ahead 1/3 speedb. 2/3-ahead 2/3 speedC. I-ahead standard speedd. II-ahead full speede. III-ahead flank speedf. z-stopg. B1/3-back 1/3 speedh. B2/3-back 2/3 speedi. BF-back full speedj. BEM-back emergency speed4. The number of revolutions corresponding to themajor speed change ordered is entered in column 3.When the order received is recorded as rpm in column2 (minor speed changes), no entry is made in column 3.5. The shaft revolution counter reading (totalrevolutions) at the time of the speed changes is recordedin column 4. The shaft revolution counter reading-astaken hourly on the hour while underway-also is enteredin column 4.For ships and craft equipped with controllablereversible pitch propellers, the propeller pitch in feet andfractions of feet set in response to a signaled speedchange, rather than the shaft revolution counterreadings, is recorded in column 4. The entries for asternpitch are preceded by the letter B. Each hour, on the hour,entries are made of counter readings. This helps incalculating engine miles steamed during the time thepropeller pitch remained constant at the last value set inresponse to a signaled order.On ships with gas turbine propulsion plants, a belllogger provides an automatic printout each hour. Thisprintout is also provided whenever propeller rpm orpitch is changed by more than 5 percent, when theengine order telegraph is changed, or when thecontrolling station is shifted. Provision must be madefor manual logging of data in the event the bell loggeris out of commission (OOC).Before going off watch, the EOOW signs the BellBook on the line following the last entry for his or herwatch. The next officer of the watch continues the recordimmediately thereafter. In machinery spaces where anEOOW is not stationed, the bell sheet is signed by thewatch supervisor.NOTE: A common practice is also to have thethrottleman sign the Bell Book before it is signed by theEOOW or his or her relief.The Bell Book is maintained by bridge personnel inships and craft equipped with controllable reversiblepitch propellers and those in which the engines aredirectly controlled from the bridge. When control isshifted to the engine room, however, the Bell Book ismaintained by the engine-room personnel. The last entrymade in the Bell Book on the bridge shows the time thatcontrol is shifted. The first entry made in the Bell Book1-2
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