One from the four turrets for howitzers calibre 210 mm installed on fort Ia "Koenig Wilhelm I". Germans used only eight these turrets on their fortifications.

Photo by 
W. Nowosad.

A crosscut of the shielded gun carriage with cannon calibre 105 mm (original term is "Schirmlafette"). Three these carriages were installed also in fortress Torun.

Drawn by 
M. WOjciechowski.

A rotary turret H.P.T. type 1893 for howitzer calibre 150 mm on fortress Graudenz (near Torun). Armoured batteries of fortress Torun were equipped by similar (but more modern) turrets type 1895.

Photo by
Krzystof Kawa.

An artillery battery for three cannons calibre 105 mm installed on shielded gun carriages which haven't staid. Left you can see an observation dome P.B.St 96 (Leicht).

Photo by
J. Grabowski.

The entrance into the caserne of the armoured fort Ia "Koenig Wilhelm I". On the right you can see the rear side caponier.

Photo by
J. Stepien.