Model, (scale 1:24), of high breast waterwheel at Wheal Friendship near Tavistock, Devon, with transmission, rods and bell crank levers. Contemporary model of the 'Old Sump Wheel', exhibited at the Great Exhibition, 1851. Made by Nathaniel Smith of Mary Tavy, Devon, England, 1844-1850. Backshot Water Wheel, 1844-1850 1844-1850
