Soil Extraction Saves Teetering Tower of Pisa
- Leaning too far. // National Geographic World;Apr99, Issue 284, p5
Details the efforts to preserve the Leaning Tower in Pisa, Italy. Prevention of visitors from entering the structure; Excavation on the building's foundation.
- ANTI GRAVITY IN PISA. Kunzig, Robert // Discover;Aug2000, Vol. 21 Issue 8, p72
Details the measures implemented by soil mechanics specialist John Burland and his colleagues to prevent the possible collapse of the Leaning Tower in Pisa, Italy. Installation of plastic-sheathed steel tendons around the tower; Addition of lead ingots to counter the leaning weight; Removal of...
- Freezing the ground in Pisa. Wheeler, Paul // Geographical (Campion Interactive Publishing);Jun95, Vol. 67 Issue 6, p6
Reports on the use of liquid nitrogen to halt the tilt of the leaning tower of Pisa in Italy. Building of concrete collar around the foundation of the tower; Failure of past efforts; Long term aim of project.
- Full tilt. Barker, Catherine L. // National Geographic;Aug2009, Vol. 216 Issue 2, following p8
This article discusses the conservation and restoration of the leaning tower of Pisa, Italy. Engineer John Burland comments on soil removal process that was used to stabilize the tower. The soil of Pisa, which is primarily sand and clay, has been giving way over time and caused several towers in...
- Propping up Pisa. Stover, Dawn // Popular Science;Aug92, Vol. 241 Issue 2, p27
Reports on measures underway to stabilize Italy's historic Leaning Tower of Pisa. Use of steel corset and counterweights; How tower was built; Long-term solutions to keep it upright.
- The less Leaning Tower of Pisa? // World Monitor;Jun92, Vol. 5 Issue 6, p6
Reports that Pisa's venerable Leaning Tower, which draws some 800,000 visitors each year, has grown increasingly precarious since its construction in 1173 because its position about five and a half yards out of perpendicular has opened cracks in the foundation. A pair of Germans: Professor...
- Leaning tower of Pisa swinging back? // Current Science;10/15/93, Vol. 79 Issue 4, p14
Reports on the installation of a system of lead weights at the base of the Leaning Tower of Pisa to prevent it from leaning further. Cause of leaning.
- A permanent solution for Pisa's leaning tower. McWilliam, Fiona // Geographical (Campion Interactive Publishing);Nov97, Vol. 69 Issue 11, p23
Focuses on approaches to stabilize the Leaning Tower in Pisa, Italy. Reduction of the inclination of the tower by half a degree; Induction of controlled subsidence below the tower's north side.
- Leaning Tower of Pisa. // Wonders of the World;1999, p16
Provides information on the Leaning Tower of Pisa.