This is a Davis Swing Churn patented on May 1, 1877 and September 9, 1879.  This is a size 2 or 10 gallon capacity designed to churn 5 gallons of cream.  This churn has the plain frame.  There was a folding frame available for a dollar more.  This butter churn was listed at $8.00 in an 1889 catalog from the company.  The churn was made by Vermont Farm Machine Co. of Bellows Falls, Vermont.  There are no paddles inside the churn.  As the churn box rocked on the cradle the cream rolled over on itself to make butter.  The company said this gentle action did not injure the butter.  These butter churns were available in twelve sizes.  The largest was 300 gallons and was made to be suspended from the ceiling beams of the creamery.  For an additional 16 dollars this company sold a treadmill attachment that allowed a dog, goat or sheep to supply the power to swing the churn.  Thanks Doug