On the Coefficient of Expansion of Quartz: Thesis (Classic Reprint)

Excerpt from On the Coefficient of Expansion of Quartz: Thesis

The sheet-iron cylinder is protected on the outside by a few layers of asbestos. The semicircular cover-plates of the iron cylinder are 5 cm. Thick, pierced at the center to admit the porcelain tube freely, and are planed smooth on their under sides, as is also the top of the cylinder, to ensure perfect contact. One of the two plates has a radial slot for the passage of the thermometers. The sheet-iron cylinder is surmounted by a divided cap similar in shape to the semi circular cover plates, and provided with asbestos and mineral-wool insulation corresponding to that in the other parts of the apparatus.

The conditions of the experiment require that the temperature of the quartz apparatus be maintained constant for long intervals of time. The oven seems well adapted to this end, since the large mass of metal employed undoubtedly renders the distribution of heat more uniform and tends to minimize sudden slight changes of temperature due to small variations in the heating current. A thermometer placed in a hole drilled in one of the cover-plates showed that while the temperature of the cover lagged behind the temperature of the air in the interior of the cylinder during the heat ing, it very quickly assumed practically the same temperature as soun as the latter was maintained constant. The excellent thermal connection between the covers and the cylinder is probably of value in compensating for loss of heat through the porcelain tube, since the covers encircle the tube closely at its middle point, and this part is quite likely to be the pomt of highest temperature in the tube.

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