SCIENTIFIC INSTRUMENTS -- B.V. BOWDEN, editor. Faster than Thought. A Symposium on Digital Computing Machines. London: 1953. 8°. Plates, 2 folding plans. Original cloth, dust-jacket (torn). -- David WHEATLAND. The Apparatus of Science at Harvard 1765-1800. Harvard University: 1968. 4°. Presentation copy from the author to J. Vellekoop. Plates, some coloured. Original cloth. -- Verne ROBERTS & Ivy TRENT. Bibliotheca Mechanica. New York: 1991. 4°. Illustrated. Original cloth-backed boards. -- And 20 other books and pamphlets of related interest. (23)