Tyuremny zamok

[FRISON Philippe]

Would you help me to find an accurate definition for тюремный замок (tyuremny zamok), which seem to have been built all over 
the Russian Empire starting from Catherine II until the 1917 Revolution, after which they were briefly renamed as "дома лишения 
свободы" (doma lishenya svobody).

The problem is that they seemed to have existed along with "остроги" (ostrogi) and пересыльные тюрьмы (peresylnye tyur'my).

Butyrka was one of them.

How can they be distinguished or more precisely defined?

The only occurences I found so far are descriptions of local prisons (in Kishinev, on the Sibirsky trakt etc...).

Philippe Frison
(Strasbourg, France)

-------------------------------------------------------------------------
 Use your web browser to search the archives, control your subscription
  options, and more.  Visit and bookmark the SEELANGS Web Interface at:
                    http://seelangs.home.comcast.net/
-------------------------------------------------------------------------