Whether you plan to build inclined bridge columns, a platform from which to repeat Galileo's experiment of measuring the acceleration due to gravity or just undertake an adventure to see if you can launch your buildings at a steep incline, you'll be interested in the slipforming achievement of a Norwegian civil engineering and contracting company. The use of inclined cylindrical columns is an important feature of the company's Selmer Tripod 300 which requires three such inclined legs. The tripod is a new concept for use in concrete gravity platforms which the company introduced in April 1974. It is specially designed to meet the offshore industry's need for platforms in waters down to 1000 feet in depth. For the construction of these columns Selmer has worked out the special slipforming technique which has now been tested so successfully. Patents have been applied for in several countries. The main purpose of the test construction was to investigate how to carry out a detached inclined slipforming operation and obtain satisfactory tolerances as well as to determine the jacking force required. This force was measured directly in the jacks. By means of strain gages Selmer also measured and recorded every 36 seconds the forces in the steel structure of the slipforming system. An important consideration in the slipforming technique is the depth of fresh concrete measured from the top of the slipform. During the tests this depth was varied by changing the rate of movement of the slipform from 2 inches per hour to 4.7 inches per hour and by varying the rate of hardening in the concrete. After having finished this test so successfully Selmer is now able to slipform cylinders with slope rations of up to approximately 15 degrees with the same degree of accuracy as for vertical slipforming.