This section is from the book "Spons' Mechanics' Own Book: A Manual For Handicraftsmen And Amateurs", by Edward Spon. Also available from Amazon: Spons' Mechanics' Own Book.
The Rogers mitre-plane, Fig. 371, is made entirely of iron, and is arranged for planing any desired angle on straight or curved work. The main bed-piece is semicircular in form, with a way or frame at its rear on which the plane runs. The upper or movable bed-plate is in quadrant form, having, at right angles, sides which act as guides for the material to be planed, and revolving on a pivot a at the end, enabling the user to form the desired angle for straight work, and place it in its proper position against the face of the plane. When the quadrant or movable bed-plate is in the centre of the main bed-piece, its side elevations form an exact mitre, so that no change is required in planing the ends of parts for frames of 4 sides. In the sides of the quadrant are 2 adjustable guides or rests kept in position by set-screws d. The special object of these rests is to enable one to finish the ends or angles on curved work with exactness. In preparing pieces for circular or oval work, frames, pulleys, emery wheels, circular patterns, etc, it is necessary to plane the ends of the various segments at varying angles. In planing these, the point of the quadrant near the plane and the adjustable guides form the rests required for accurate work.
The quadrant is kept in position at any angle desired by pressing the catch c down into the notches prepared for it, or by the tbumb-screw b, and can be used in connection with the arms or guides as desired. It is sold by Churchills, Finsbury, at prices varying from 90s. for the 2-in. size, to 135s. for the 4-in.