Such a device is useful in making compound bends in electrical conduit to ensure that {HEAD ~ the bends} keep each end of {TAIL ~ the conduit} in a common, or vertical plane 
Such a device is useful in making compound bends in electrical conduit to ensure that { HEAD ~ the bends } keep each end of { TAIL ~ the conduit } in a common , or vertical plane
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH