Construction
Who was in charge of the construction of the military infrastructure at Oliver Hill
Lt. Hussey
How many personnel did the shelter house?
22
What was stored in the gun pit?
Ammunition and Cordite cartridges
In what years were H1 and H2 manufactured?
H1 1901
H2 1902
Why is a timber pole used to push the cordite cartridges?
To prevent any sparks
In what years did construction of the infrastructure start and finish
started 1935
finished 1937
What do the names on the seats represent?
Representative of the 2500 personnel based at Rottnest
What was the weight of
a) the shells
b) the cordite cartridge
a) 172 kg
b) 25 kg
What did the loading angle have to be?
50
How many cordite cartridges were used for a half charge?
1
Why was a railway needed?
9.2" gun components were too heavy
What was the Engineering Heritage National Landmark award (on the wall in the crew shelter) presented to the RIA for?
For the significant technical achievement of the construction of Fremantle Fortress Rottnest Island, WWII Coastal Defence facilities
How many degrees could the platform be rotated?
3600
What was the approximate fighting range?
28 - 29 km
Where did the aiming assistance information come from?
Plotting room and the Battery Observation Posts
Approximately how long were the mounting bolts for the gun platform?
3m or 9' 11"
What were 11 crew on standy-by for in the crew shelter?
In case manual operation of the gun was required
What are the 2 methods of rotating the platform?
1. Hydraulics
2. By hand
How many crew were in the gun platform?
5
What was used to expel cordite fumes and any burning residue out of the muzzle?
Compressed air
How long and how heavy was the 9.2" barrel
11m long
28 Tonnes
What was the gun store for?
Tools and spare parts for the maintenance of the gun.
What is the tray at the rear of the barrel cylinder for?
It was a water catchment tray.
To fire the gun a tube was inserted into the firing mechanism at the rear of the breech block. How was this tube fired?
either electrically or by percussion
What was the rate of fire under full power?
3 rounds per minute
average 2 rounds per minute