April, page 55—The price of Physics of Solid State Devices by T. H. Beeforth and H. J. Goldsmid (Pion, 1970) is £3.00, not $3.00.
July, page 60—Resources for the History of Physics, edited by Stephen Brush (Univ. Press of New England, 1972) is 188 pages in length, not 90.
August, page 35, column 2—The first full sentence should be: “The combination of cold cap, baffles and cold trap greatly diminishes the backstreaming, but it also greatly impedes the pumping speed.”
July, page 30—In the caption to figure 7, several of the “extrinsic merit” criteria have been listed out of their correct order. To arrive at agreement with the histogram, transpose 7 with 8, 9 with 10 and 11 with 12.
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© 1972 American Institute of Physics.
1972
American Institute of Physics
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