Fitzgerald were first described in 1906., And their image was published in the magazine “Engi-Neering News” on May 16, 1907. The skating rink weighed 2 g and had fists similar to those that are used now, but somewhat large sizes. The pressure from the cams was about 2.8- 3.5 kg/cm2. This skating rink moved with a horse harness and was equipped with a seat for a drummer. By the 20s, fist rollers appeared, which are now called “light”. Their weight ranged between 2.5 and 4 tons, the pressure of the cams was 4.2-7 kg/cm2.Modern “heavy” fist rollers appeared in the 30s to compact earthen dams and road embankments. The heavy rink weighed up to 12 tons and created the pressure of the cams 21-42 kg/cm2. Even heavier rollers, weighing up to 30 tons and with fists up to 45 cm long, were tested to compact the bases for aerodrome coatings during and at the end of the Second World War, but turned out to be impractical. Further development of fist rollers after the Second World War mainly concerned the shape of the fists and improvement of the structure, and not an increase in the size of the rink. Smooth rollers began to supply ledges and furrows like treads on tires, and therefore they began to give an effect similar to fist rollers. Recently, large self -propelled fist rollers have been used on the construction of earthen dams with great economic benefit compared to towed rinks. The steam smooth rollers were supplanted by rollers with internal combustion engines and now turned into three -wheeled rollers used mainly to compaction of fragmented stone and other elements of road clothing rolled in thin layers, as well as in tandem smooth rollers used to roll asphalt roads. In some countries, smooth skating rinks are still used to compact soils. In 1929 and 1930. Hebornly used heavy 30-ton body trailers and tanks with water on steel wheels during road construction in California. Heavy steel wheel rollers were used in other cases, but now they usually weigh less than 15 tons.
