File:Polfreeman's improved winnowing machine (constructed 1802 or before).png
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DescriptionPolfreeman's improved winnowing machine (constructed 1802 or before).png |
English: Engraving of an improved winnowing machine, manufactured by Messrs. T. and J. Polfreeman of Long-acre, London. – Quote: "The apparatus here described, requires the attendance of three persons, namely, one to set it in motion; a second to feed, or furnish a supply of grain; and a third, to clear away the corn, after it is freed from impurities. With such assistance, it will winnow 5 quarters of wheat per hour, or 6 quarters of barley and oats: it will likewise clean pease, beans, and coffee; so that it cannot fail to be peculiarly useful in the West Indies. The working of this machine is very simple; so that, with a little practice, any person may understand its various parts, and the sieves proper for the corn to be winnowed. Lastly, as different kinds of grain vary in quality, the blast should be adjusted accordingly, by means of the Venetian-blind (marked 5, in Fig. 2) ; to which a brass plate is affixed."' – Description: Fig. 1.
Fig. 2.
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Date |
before 1803 date QS:P,+1803-00-00T00:00:00Z/7,P1326,+1803-00-00T00:00:00Z/9 |
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Source |
English: Image extracted from a scan of the following book: Anthony Florian Madinger Willich: The Domestic Encyclopædia; Or, A Dictionary Of Facts, And Useful Knowledge: (…) Volume Fourth, published in London, 1802; cf. page 339 and supplement pages 454–455 ("Winnow"); the illustration is on p. 455. |
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Author | Unknown authorUnknown author (Messrs. T. and J. Polfreeman) | |||||
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current | 22:38, 1 August 2011 | 1,397 × 2,361 (6.6 MB) | Bdk (talk | contribs) | {{Information |Description={{en|1=Engraving of an improved winnowing machine, manufactured by Messrs. T. and J. Polfreeman of Long-acre, London. – Quote: "The apparatus here described, requires the attendance of three persons, namely, one to set it in m |
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