A novel method for measuring thermal conductivity

Includes bibliographical references (pages 27-28)A new apparatus to measure the thermal conductivity of cast\ud materials has been developed. This steady-state, radial device operates\ud on the principle that cylinders with the same geometry and surface\ud temperature in the same environment will transfer heat at the same rate.\ud Long twin cylinders were used. One cylinder contained the material to\ud be tested in the annulus between two concentric tubes. It was heated\ud by condensing steam on the internal surface of the smaller tube; this\ud produced a known temperature at the inner surface. The control cylinder\ud was heated electrically by an axially mounted nichrome heater wire.\ud By varying the power to the heater wire the external surface temperature\ud of the control cylinder could be matched to that of the test\ud cylinder. (See more in text.