Abstract
In the transmission type curved crystal focusing x-ray spectrograph, a crystalline lamina is imprisoned between the convex and concave surfaces of two rigid metal plates cut in the shape of arcs of right circular cylinders of appropriate radius to impose the correct curvature on the lamina. Recently I have sought a method of cutting such circular cylindrical arcs of very large radius of curvature (say 2 meters) without the delay and expense involved in the use of a large vertical boring mill of four meters diameter. The method which I describe here might also prove of use in the production of circular cylindrical arcs of metal for lapping cylindrical lenses.
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