Encyclopedia
Pyroscope
Pyroscope (pyrometric control cone): a truncated triangular pyramid of specified dimensions, manufactured from ceramic mass of a defined composition and possessing under specified heating conditions the property of softening and "falling" at a certain temperature called the falling temperature
Source: "GOST R 53788-2010. National Standard of the Russian Federation. Refractory materials and refractory raw materials. Methods for determining refractoriness"
(approved and introduced into effect by Order of Rosstandart dated May 25, 2010 No. 81-st)