Australian Army Museum of Western Australia > Records

World War 2, Western Australia, Rottnest Island, Coast Artillery Instrumentation, Director No 10

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Coast Artillery Fire Control - Target and Projectile Coincidence

Overview

Director No 10 . A Director No 10 was installed in all Fortress Observation Posts. It was an accurate instrument for measuring the bearings to targets. Continuous communication was maintained by telephone to the plotters in the fortress plotting rooms.

Details

Registration number

cwa-org-32-54-697

Inscriptions and markings

Fortress Observation Posts were all similar being camouflaged, splinter proof concrete blockhouses with unrestricted windows seaward. Each window had externally mounted steel shutters. Each location was on high ground with good visibility seaward. The locations were: Bare Hill (Code Name "Bare"); Cape Vlamingh (Code Name "Flame"); Mount Herschel (Code Name "Shell") and Tree Hill (Code name "Hill").

The roll of the Fortress Observation Posts in the coast defence system was to supply continuous target observation data to the Fortress Plotting Rooms at Oliver Hill and Bickley Point.

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.

Australian Army Museum of Western Australia

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