Pennsylvania Clocks And Clockmakers by George H Eckhardt 
 
An Epic of Early American Science, Industry and Craftsmanship. The first book devoted solely to clocks made in Pennsylvania. It is a mine of new information on old timepieces. It gives a detailed account of Pennsylvania tall case clocks and their European antecedents. It tells of their makers, who included Banjamin Franklin and Matthias Baldwin (of locomotive fame); of the part the clocks played in the development of Pennsylvania; of the succeeding styles in decoration, furniture, and folk art that strongly influenced their design....