Journal of the American Ceramic Society

doi: 10.1111/j.1151-2916.1927.tb16808.xpmid: N/A

doi: 10.1111/j.1151-2916.1927.tb16809.xpmid: N/A

doi: 10.1111/j.1151-2916.1927.tb16810.xpmid: N/A

Rhead, Frederick H.

doi: 10.1111/j.1151-2916.1927.tb16811.xpmid: N/A

ABSTRACT The lines of development of a course for training ceramic artists, who are very much in demand, are outlined. Ceramic shape design for quantity production involves a study of factory processes, product specifications, both consumer's and factory, and manufacturing specifications. Examples of commercial designing are demonstrated, using drawings of a series of glass designs as illustrations for various points made. The filing of research studies in design, relation of shapes to product specification, and product development are discussed. The difference between the art engineer and the craftsman is pointed out.

Spencer, C. D.; Ott, L.

doi: 10.1111/j.1151-2916.1927.tb16812.xpmid: N/A

ABSTRACT In this paper a number of experiments are described confirming the protection theory of acid frosting. A description is given also of an etching cell by means of which it is possible to observe, through a microscope, the initial stages and the progress of events during the acid etching of glass surfaces. A theory of the fortification or strengthening of abraded and acid‐etched surfaces is proposed and illustrated.

Geller, R. F.

doi: 10.1111/j.1151-2916.1927.tb16813.xpmid: N/A

ABSTRACT The history and purpose of the investigation are outlined and detailed reports are made on (1) the results of air elutriation and coöperative sieve and chemical analyses of the nineteen feldspars being studied, (2) coöperative determinations of softening point, and (3) true specific gravity. The paper also includes a report on tests of mechanical strength, light transmission, porosity, volume shrinkage during firing, and thermal expansion of whiteware specimens in which the feldspars being studied were the only variable component.

Keenen, F. G.; Bennett, G. W.; France, Wesley G.

doi: 10.1111/j.1151-2916.1927.tb16814.xpmid: N/A

ABSTRACT An automatic apparatus for taking single photographic exposures at regular intervals of time over periods of from 12 to 36 hours was constructed. It consists of a large air thermostat and three mechanical units: (1) the thermal regulator, (2) the illuminating and optical system, and (3) the automatic mechanism controlling the camera and illuminating system. A detailed description of the construction and operation of the apparatus is given.

Norton, F. H.

doi: 10.1111/j.1151-2916.1927.tb16815.xpmid: N/A

ABSTRACT The need for accurate control of an oil‐fired furnace operated at a temperature above the range of platinum thermocouples led to the development of a new type controller. Disadvantages of ordinary types of controllers are discussed. The mounting of the radiation pyrometer used is described. Full details of the construction and operating principles of the controller are given. Results obtained are far better than with most careful hand control.