1. Peacock, R., private communication. Outlined in “Microphotography” by G. W. W. Stevens (Chapman and Hall, London, 2nd Edn., 1968), pp. 318-9.
2. Horne, D. F. “Dividing, ruling and mask-making”, (Adam Hilger Ltd., London, 1974), pp. 218-222.
3. Allen, D. M., Horne, D. F. and Stevens, G. W. W. “Preparation of specimens for microscopic examination of edge profiles”,J. Microscopy, in the press, Paper Ref. 1730.