2C 2 De/cripiion of Mr. Salmons 



and the refiduum property edulcorated with a fuitaBIe quan- 

 tity of alcohol. When all the fpirit of wine had evaporated * 

 over a gentle fire, the quantity of the pure white fugar ob- 

 tained was fuch that in general 8 pounds of pure fugar may 

 be expe&cd from ioo pounds of raw beet roots. According 

 to this refult, an acre of land, which may produce 46,000 

 pounds of beet root, will yield 22 hundred weight of raw 

 fugar. If we allow four pounds of beet root to one fquare 

 foot, a German mile will produce 16,756 hundred weight 

 2 quarters and 14 pounds. This is all as yet known re- 

 fpe&ing the difcovcrv. What M. Achard ftill keeps fecret 

 is the refult of his fifteen years experience refpe&ing the 

 cultivation of thefe beets. He has found that the quantity 

 of fuo-ar to be obtained will depend on the foil in which they 

 are fown, and the method of culture employed. The king 

 of Pruffia has not only beftowed a confiderable reward on 

 M. Achard for this difcovery, but is purfuing every poflible, 

 means to render it beneficial to his dominions. 



XI. Drfcriptionof an Improved Machine for Cuit'mg Chaff,, 

 invented by Mr. Robert Salmon, of JVobum, Bed- 

 ford/hire. From Tranfa&ions of the Society for the En- 

 couragement of Arts, &c. Vol. XV. 



W ITH this machine the chaff is cut by two knives,. 

 A A, (Plate VI.) fixed on the infide of the fellies of two, 

 wheels, B B, which are ftrongly connected together ; the 

 edge of the knives being at an angle of about forty-five de- 

 grees from the plane of the wheel's motion. Thefe knives 

 are fo fixed as to be forced forward by fprings, C C, on the 

 wheel 5 which fprings are formed to adjuft, and act more ok 



" Diftillation mi^ht be employed to fave the lofs of the alcohol. Edit. 



+ Thirty guineas were voted to Mr. Salmon for this improved machine, 

 of which a model is referved in the Society's rcpofttory for the infpe&ioa 

 of the public. 



