The article describes a development of the fortification art in the 19th century which led to the formation of the socalled retrenched camp around a defenced post. The subject of the discussion is a retrenched camp in Rome (1877— —1894). Against this background the fort of Monte Antenne has been presented in broader terms. It represents a wellpreserved example of the 19th-century far-flung defensive object. The author presents the location and construction of the fort, its armament and outfit. The Rome entranched camp is compared to a Russian stronghold known as "Warsaw” built at the same time. The final part of the article offers proposals for new functions which can be located in a historic fort.
Venice played a special role in the development of the so- called bastion system of fortification at the end of the 15th century. One of more widely known architects — constructors of the fortification of Venetian tracks of that period was Michele Sanmicheli. His work was the fort of Sant' Andrea built in 1545—1949, situated on one of the islands in Venetian Lagoon. Its objective was to protect the entrance to St Mark's basin against the attack from the sea. The plan of the port was very original and resulted from a longish shape of the island. This historical structure is at present subjected to preservation techniques within the programme of the protection of Venice against the sea flood. An essential element of this protection is a partition made of high-diameter concrete poles. In future this fort is to be adapted and will serve as a yachting centre.
The bridge in the Ujazdowski Park in Warsaw, built in 1898, is one of the oldest and perhaps even the oldest preserved example of the use of concrete in Poland’s capital. The bridge resembles an experimental construction in Warsaw (1892), well-known from literature, and an expe- rimental bridge in Lvov (1894). It resembles also similar foreign structures of that time. The bridge in the Ujazdowski Park can thus be included into a group of semi-experimental constructions typical of an early period of using concrete. This bridge represents an interesting monument of engineering that deserves care and protection.
In the years 1983-1986 the State Ateliers for the Conservation of Cultural Property made up a program for the restoration of the Casbah Citadel in Algiers. The work on the program was preceded by complex studies, particularly of the old anti- seismic protection measures. In this article the authors present their observations, which do not exhaust the issue. They are as follows: 1. The construction is located on a rock massif. 2. There is a considerable amount of mutually perpendicular bearing walls in the citadel. 3. Over each capital of a column or pillar there are 3 -4 layers of short ovolos of thuya wood. 4. In certain bearing walls the wooden ovolos have been walled in 3 -4 layers at the height of the storey. 5. The bearing walls have been made of full ceramic brick, 3 -5 cm thick, and generally with lime mortar, ground brick being added as filler. On the basis of historical accounts it can be stated that the applied construction methods, chosen on intuition and from experience, not following theoretical analysis, have proved correct (particularly during the strong earthquake of 1716).
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