There were sometimes variations within ship types for the High Seas Fleet, and that may account for varying conning tower info. I will see if i can find a photo.... there is a good site for Ship data i will check too.
Index of U boat Photos:
http://www.german-uboats.com/Uboat%20Photos/
this site has some good info and pics on WWI sub warfare against Allied ships:
http://www.titanic-whitestarships.com/WSL-Uboat.htm
Execellent images of interior of U 88 including control panel, engines and more
http://www.cawreckdivers.org/Wrecks/ub88.htm
Type
U 19
Shipyard
Kaiserliche Werft, Danzig (Werk 13) Ordered 25 Nov 1910 Laid down 20 Oct 1911 Launched 10 Oct 1912 Commissioned 6 Jul 1913 Commanders 1 Aug 1914 - 15 Mar 1916
Constantin Kolbe16 Mar 1916 - 10 Aug 1916
Raimund Weisbach11 Aug 1916 - 4 Jul 1917
Johannes Spieß5 Jul 1917 - 15 Oct 1917
Heinrich(i.V.) Koch25 Oct 1917 - 16 Nov 1917
Hans Albrecht Liebeskind17 Nov 1917 - 31 May 1918 Kptlt.
Johannes Spieß1 Jun 1918 - 11 Nov 1918
Hans Albrecht Liebeskind Career 12 patrols 1 Aug 1914 - 19 Sep 1916
III Flotilla
19 Sep 1916 - 1 May 1917
Baltic Flotilla
1 May 1917 - 11 Nov 1918
III Flotilla
Successes57 ships sunk for a total of 97,893 tons.
2 ships damaged for a total of 4,052 tons.
1 ship taken as prize for a total of 733 tons.
1 ship sunk for a total of 1,261 tons. Fate
24 Nov 1918 - Surrendered. Broken up at Blyth in 1919-20.
U 9 Class Boat
the U - 9
U - 20
U 23
UC - 42
U 106 -