Coupling Box Small 320×236 Medium 640×471 Large 1024×754 Download Tiff Original 2400×1768 | (579.4 KB) Description The box or ring of metal connecting the contiguous ends of two lengths of shaft. Keywords differential, dynamometer Galleries Machines Parts Source: William & Robert Chambers Encyclopaedia - A Dictionary of Universal Knowledge for the People (Philadelphia, PA: J. B. Lippincott & Co., 1881)