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Two men are using a plank over a large log as a see-saw; representing the mechanics of levers. Engraving.
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London (No. 60 St. Paul's Church Yard) : Printed for & sold by Bowles & Carver.
1 print : engraving, oval ; image 20 x 15.5 cm
Six droll prints of the mechanical powers, allegorically and laughably expressed. Levers. Book 13.
Wellcome Library no. 36106i