Noteworthy technology in No.1sea fort construction
The first sea fort constructed by filling the sea in Tokyo Bay
Structure of No.1 sea fort
No.1sea fort was made of rubble stones as dropping ripraps, and a breakwater wall with a large number of field stones stacked on top of it, surrounding around the fort, then filled inside with sands to construct an artificial island.
One of the characteristics of No.1 sea fort is that there are two rows of long large stones at the base and offshore to prevent waves.
Battery of No.1 sea fort
At the beginning of the construction of No.1 sea fort (during the Sino-Japanese War), its armament was equipped with one 19cm cannon, four 12cm cannons andfourteen 28cm howitzers.
It is said that there was a major renovation work after the Great Kanto Earthquake, but the specific renovation time is unknown.
1: two 12cm cannons (disappearing carriage)
2: two 12 cm cannons (siege gun rack)
3: one 19 cm cannon
4-10: fourteen 28 cm howitzers
Right wing observation post