Influence of variable alumina and silica on the relative viscosity of a porcelain glaze (1914)
Sewell, Sidney Isaac · leaf 18
7. the rate of five degrees per minute. The penetration of theneedle was measured on the vernier, observations being taken atintervals during the rise in temperature. A diagram of the appara-tus is shown on Chart III. Ir consisted of a platinum coil elec-tric furnace which was connected with a D.…
