A plane with an inverted "V" shaped bottom with the cutter at the point of the "V". Used for Beveling an Edge uniformly. Great differences exist in models of chamfer planes. Paul Hasluck (1903:48-49) shows three: Preston's plane; Melhuish's plane, and Nurse's plane. [need photos rather than Hasluck's drawings]
Source: Paul Noonan Hasluck, The Handyman's Book, London: Cassell, 1903, 48-49; Home Craftsman 4 march April 1935, page 172.