This Specification applies to toolmakers' straightedges of 10 short length, intended for very accurate work, and having one working edge, which is bevelled and very slightly rounded off (commonly described as a "knife-edge").NOTE. - The attention of the Purchaser is drawn to the necessity for indicating, in his enquiry and order, his particular requirements in regard 15 to type and length, and whether a test plate (see Clause 6) is required.