London: Ilford Limited, 1947. 200 g; 60 pages, Preface by Research Laboratory, Ilford Limited, 6 appendices, bibliography and index. The text is illustrated with graphs, figures and tables. Blue coloured boards with blind stamped title and author name on the front panel and gilt writing on the spine. Bumping to the head and to the heel of the spine and a little rubbing as well. Bumping has also occurred to the top book edge and to the top book corners. Browning and foxing to the top paper edge and browning to the other paper edges. Browning to the endpapers and to the internal pages as well. Illustrated dustwapper, showing a cathode ray tube, with black and white writing on the front panel and black on the spine. The dustwrapper is rubbed, faded and quite grubby. Rubbing to the corners and to the dustwrapper edges. Small chips to the lower dustwrapper front edge with associated creasing. Small splits to either side of the top spine edge and there is a 0.25 " tear to the top rear dustwapper edge with associated creasing. Generally are dustwrapper that showing its age. A book on cathode ray tube and its application for physical measurement, written just after World War II. Ilford Technical Monographs -- Number-one. Digital image available upon request.. First British Edition. Blue Cloth. Reasonable for Age/Average. 12mo - up to 7 ¾" tall - Duodecimo. Technical.