An unusual method for jacking a 100 foot diameter, 125 ton form to the top of the Niagara Falls, Ontario, makes this project rather unique in construction techniques. The 380 foot concrete shaft was cast in 35 days and was topped off with a framework of steel. This steel frame supported forms for casting the concrete base of the 100 foot diameter globe, and was removed after casting. The form was suspended from the top structural steel by means of fifteen 1 and three-fourth inch by 1 and three fourth inch by 400 foot steel rods with the hydraulic jacks at the top. The jacks raised the platform at the rate of 4 inches per stroke, approximately 4 feet per hour. In addition to the jack rods, some 45 hanger bolts 25 feet long and 2 and one-half inches in diameter were installed when the form reached the top. After the concrete was placed, the steel circular base and the forms were removed leaving the parabola of concrete as the supporting base for the globe. The globe slab cantilevers approximately 40 feet from the face of the concrete shaftway. The completed tower rises more than 500 feet above the base level.