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We see for the first time in al-Jazari's work several concepts important for both design and construction: the lamination of timber to minimize warping, the static balancing of wheels, the use of wooden templates (a kind of pattern), the use of paper models to establish designs, the calibration of orifices, the grinding of the seats and plugs of valves together with emery powder to obtain a watertight fit, and the casting of metals in closed mold boxes with sand.
Donald Hill
What happened in the Haighmoor seam gave to Bamforth and myself a first glimpse of the "emergence of a new paradigm of work" (Emery, 1978) in which the best match would be sought between the requirements of the social and technical systems. Some of the principles involved were as follows:.
Eric Trist