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XVii century, Magdeburg experiment
Engraving showing an experiment with an evacuated sphere being carried out at Magdeburg, Germany in 1654. In the demonstration 16 horses ( here only 8 represented) could not pull apart the two halves of an evacuated sphere, which became known … Continued
Horticulture engraving: grafting techniques and grafting knives
Horticulture: grafting techniques and tools. Grafting is a horticultural technique whereby tissues from one plant are inserted into those of another so that the two sets join together.