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History:
– Slip forming technique used in early 20th century for silos and grain elevators
– James MacDonald pioneered slip form concrete construction
– MacDonald patented concept of circular bins in clusters in 1907
– MacDonald patented device for moving and elevating concrete form in 1917
– Slip forming used for AT&T Long Lines towers in 1947-1950

Silos:
– MacDonald Engineering constructed over 40 concrete towers using slip-form method
– Towers up to 58m tall for AT&T Long Lines microwave relay stations
– Landmark Hotel & Casino in Las Vegas built in 1961 with slip form concrete
– Slip forming technique utilized worldwide by MacDonald Engineering
– Coal silos and grain silos commonly constructed using slip forming

Residential and commercial building:
– Slip forming introduced to residential and commercial buildings in 1950s in Sweden
– Bygging developed first hydraulic hijacks for slip forming in 1944
– Slip forming used in high-rise buildings in the USA from late 1960s
– Slip forming technique pioneered by Bygging in Västertorp, Sweden
– Slip forming adapted to various structures like mining head frames and high-rise office building cores

References:
– Slip forming technique introduced in Baltimore according to Concrete Construction Engineering Handbook
– James MacDonald’s paper on moving forms for reinforced concrete storage bins
– Slip forming used for construction of CN Tower in Toronto
– Slip forming technique referenced in Washington Post in 1971
– Slip forming technique utilized to build the Shard London Bridge tower in 2010

External links:
– Slip-Form Construction Time Lapse video from The Dalles, Oregon
– MacDonald Engineering’s slip form concrete grain silos video
– Additional information on slip forming technique on the Slipform website