COAST ARTILLERY, JOURNAL - Air Defense Artillery

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508 THE COAST ARTILLERY JOURNAL thirty seconds on the bell. A design for the board is shown in Figure 2 and is self-explanatory. It should be made locally by batteries for which desired. FIe. 1 C-oPERATI01\" OF THE SYSTEM 11. The detailed operation of the fire control system follows, with slight deviations, that described in Coast Artillery Board Project 1\0. 75, "Fire Control System for I55-mm. Guns," published in the August,
MORTARFIRE CONTROL 509 1924, COASTARTILLERYJOURNAL.Predictions for firing one minute ahead were made every thirty seconds. The operation of the plotting board was normal. The operation of the Range Correction Board, Impact Board, Spotting Device, Wind Component Indicator, and prediction devices was as usual; the operation of the range percentage corrector, deflection board, and mechanical display board but slightly varied. The detailed operations of these devices are described in T.R. 435-221, "Fire Control and Position Finding," the report on Coast Artillery Board Project No. 75, and references contained in that report. It will be.seen that only in frequency of prediction and in interpolation between predictions was there any material change from the present system. 12. For the Coast Artillery Board Universal Deflection Board, with interpolator, two operators, A and B, were required. A, connected by telephone to the azimuth operatOl" of the special display boards in each pit, set the uncorrected azimuth of the setforward point. B set the slide of the deflection board at the intersection of the proper cross wind and drift curve with the line corresponding to the corrected elevation. A then read the corrected azimuth of setforward point and telephoned it to the pits; while he was doing this he was also interpolating and he next read the interpolated azimuth and telephoned it to the pits. A applied any azimuth corrections ordered. NOTE.-In changing zones no interpolation was or could be made. 13. In the pit the two operators of the special display board were stationed in rear of the board. Each was equipped with chalk and an eraser. They were men selected for ability to make legible figures. It will be noticed in Figure 1 that the spaces for data on the two sides of the revolving blackboard were echeloned sp as to minimize interference when men were writing data simultaneously. The operators will be designated in this discussion as C and D. C recorded zone and elevation and was connected to operator of range percentage corrector interpolator. D recorded azimuth and was connected to operator A of paragraph 12, above. As noted, the time interval bell rang three times on the minute and half-minute intervals and two times at fifteen seconds and forty-five seconds. With sufficient training, all of the operations within the range section, including the posting of data on the special display hoard in the pit, can be completed on an average of twenty-five seconds after the three bells on which each prediction is begun. The special display board was turned to the pit exactly on the third note of the three bells following the three bells on which the prediction began, or about five seconds after the data were posted. Data received by C and D provided for laying the mortar on the next but one ringing of three bells, and these data were displayed thirty seconds in advance of firing tillie by turning the board on the next 3-bell ring. Before
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OFFICE PHOND, 138.J ADVERTISEMEl'\T
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ADVERTISEMENTS S. J. WATSON, JR., E
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ADVERTISElIIENTS FRESH.FLORIDA ORAN
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ADVERTISEMENTS SALASKY OPTICAL CO.
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F. W. DARLING, President W. H. FACE
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