“…and increases gradually to approximately 10% at about 18°K. For this temperature range, there has been much work concerning the expansion coefficients and integral expansions for these substances. For brass, expansion coefficients have been measured by Hennings (6) and Johansson (7), and integral expansions by Beenaker and Swenson (3). Integral expansions of brass have been measured also by Fraser and Hollis-Hallet (4) and Keyston, McPherson, and Guptil (8).…”