By Peter W. Hawkes
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Sample text
D. student in physics (my Bristol degrees were in physical chemistry). -ray 26 V. E. COSSLETT spectrometer for 1- to 15-MV electrons. It was in effect an outsize electron lens, possibly the largest constructed up to that time. The maximum induction (1 T) was not unduly high, but it had to extend over a large volume between polepieces containing an axial stop. The six coils of outer diameter 40 cm were strip wound on a yoke 75 cm long originally designed by J. D. Cockcroft for a different purpose (Cosslett, 1940a).
T. E. Allibone, whose work was known to me, but, as he was away in the United States, a reply came from the head of the high-voltage research department, F. R. Perry. " The outline specification of this "austerity" model, later to become the EM2, was enclosed. It bore more resemblance to the RCA than to the Siemens instrument. The maximum 28 V. E. , the column) would have three viewing windows and a single-plate camera, taking five 2-in. pictures per plate. The maximum magnification was limited to 10,000 X in the interests of a relatively large imagefieldcombined with adequate brightness at top magnification.
Pease, Scanning electron microscopy. Adv. Electron. Electron Phys. 21, 181 (1965). 24. A. V. Crewe and J. Wall, Grenoble, 1970 Vol. 1 (1971). 25. B. Krisch, K. H. Müller, R. Schliepe, F. Thon, and D. " Siemens Druckschrift, 1976. 26. M. von Ardenne, "Tabellen zur angewandten Physik," Vols. 1 and 2, p. 142. Dtsch. Verlag Wiss. Berlin, 1962. ON THE HISTORY OF ELECTRON MICROSCOPY 21 27. D. Gabor, Oszillographieren von Wanderwellen mit dem Kathodenoszillographen. Forschungsh. Studienges. Höchstspannungsanlagen 1 (1927).