The photos show an angle device by Robert Marples, Sheffield. This drawing (and some that may be used in future) is courtesy of Dr James E. Price.
WOOD, Albert A. , Patent: 662683, Type: Hollow Auger, Date: Nov 27, 1900
BONNEY, C.S., Patent: 105896, Type: Hollow Auger, Date: Aug 2, 1870
SMITH, Heston J., Location: Three Tons, Pennsyslvania, Patent: 7689, Type: Hollow Auger, Date: May 22, 1877, Reissued: March 30, 1880
