I igure 11. -Making screws in France in the third quarter of the 1 8th century. 

 From L 'Encyclopedic, ou dictionnaire raisonne des sciences, des arts et des metiers . . . 



rctfiiil de planches sur les sncmc\, lr\ arts liheraux, et If. arts mechaniqv.es, ave< lew 

 explication (Paris: 1762- 1772), vol. 9, plate 1. 



J& " 



Figure io I >i 1 vils O] nn mai him in the lefl foreground of figure q, showing the crude 

 tool support without screw adjustment. From V Encyclopedic, vol. 9, plate 2. 



112 



HI I i I.TIN 240: CONTRIBUTIONS FROM THE MI'SEI'M OF HISTORY AND TECHNOLOGY 



