Abstract
THE disadvantage of the ‘solid-image’ microscope described by Gregory and Donaldson1, as they point out, is that objects are seen through a relatively intense haze of background light, rather as if they were immersed in milk. There is a fairly straightforward way around this difficulty, though it entails a loss of some of the elegant simplicity of Gregory and Donaldson's instrument. During 1948–49 I devised and built at King's College a 3-dimensional scanning microscope on the same basic principle2, which was described briefly in a report on university research in physics in 19493 and exhibited at the College conversazione in that year. The slide carrier was vibrated in depth between 10 and 20 times a second with a saw-tooth motion, by means of a linear electromagnetic servo. The object, however, was scanned laterally by a flying spot on a cathode-ray tube, and the signal detected by a photomultiplier, exactly as in the 2-dimensional ‘flying spot microscope’ later (and apparently independently) described by Roberts and Young4 of University College, London. The three deflecting voltages and the photomultiplier signal were supplied to a 3-dimensional protective cathode-ray tube display of the type devised for use in radar and electronic computing5, so that a ‘solid’ representation of the object appeared on the screen and could be rotated at will by calibrated controls which enabled angles to be read directly.
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References
Gregory, R. L., and Donaldson, P. E. K., Nature, 182, 1434 (1958).
MacKay, D. M., Brit. Prov. Pat. Spec. 844/49.
Teegan, J. A., BEAMA J., 378 (1949).
Roberts, F., and Young, J. Z., Proc. Inst. Elect. Eng., 99, IIIA, 747 (1952).
Parker, E., and Wallis, P. R., J. Inst. Elect. Eng., 95, III, 371 (1948). MacKay, D. M., Electronic Eng., 248 (July) and 281 (Aug. 1949).
MacKay, D. M., Brit. Pat. No. 592,372 (1947); Electronic Eng., 284 (July 1950).
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MACKAY, D. A ‘Solid-Image’ Microscope. Nature 183, 246–247 (1959). https://doi.org/10.1038/183246b0
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DOI: https://doi.org/10.1038/183246b0
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