Australian Army Museum of Western Australia > Records

World War 2, Western Australia, Rottnest Island, Coast Artillery Instrumentation, Fire Direction Table Mk 3B

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Subcollections

Coast Artillery Fire Control - Target and Projectile Coincidence

Overview

Fire Direction Table, Mk 3B - The Fire Direction Table received electrically the target range and bearing from either the Coordinnate Convertor or the Depression Position Finders at the Battery Observation Post. Its purpose was to generate firing data, having regard for the projectile time of flight, into future position firing data based on course and speed information being applied to current traget position. The range and bearing of this future position was transmitted to the magslip receiver data on the guns.

Details

Registration number

cwa-org-32-54-649

Inscriptions and markings

Unlike a modern electronic calculator, this instrument was a mechanical caluculator based on input wheels and precise gear trains. To maintain this flow of data input , six operators were required to man the table.

Contextual Information

This entry is based on research, documentation and technical drawings prepared by John Mercer during many years as a leading member of the Rottnest Island Military Restoration Committee and the Defence Heritage Interpretation Plan Group.

Links to additional resources

Manual - Fire Direction Table Mk 3B

Australian Army Museum of Western Australia

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