Australian Army Museum of Western Australia > Records

World War 2, Western Australia, Rottnest Island, Coast Artillery Instrumentation, Ballistic Correction Calculator, No 1 Mk 1

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Subcollections

Coast Artillery Fire Control - Target and Projectile Coincidence

Overview

Ballistic Correction Calculator No 1 Mk 1 – Firing data contained in Firing Tables were based on a set of standard conditions. At the time of target engagement, any variation from these standard conditions affected the accuracy of predicted weapons fire. The Ballistic Correction Calculator determined the corrections to range and bearing necessitated by variations in meteorological conditions. Ballistic air temperature, wind speed and direction, barometric pressure charge temperature and projectile type data was entered on the relevant input scales. The read out showed the corrections to be set on the fire direction table to account for the variations from standard conditions.

Details

Registration number

cwa-org-32-54-648

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 - Ballistic Correction Calculator

Australian Army Museum of Western Australia

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