FIXED-POINT BLACKBODY FURNACE

摘要

PROBLEM TO BE SOLVED: To provide a fixed-point blackbody furnace capable of preventing molten fixed-point metal in a fixed-point crucible from leaking to the outside of the furnace.SOLUTION: A fixed-point blackbody furnace 1 houses a fixed-point crucible 11 comprising: an outer cylinder 11a for housing fixed-point metal; and an inner cylinder 11b whose one side has a cross-sectional cone-shaped closure part 11e and whose other side has a measurement opening part 11f for measuring a temperature fixed-point, and that is housed in the outer cylinder 11a so as to be a blackbody hollow. A heat insulator 20 is disposed on a front side of the measurement opening part 11f. The heat insulator 20 is formed with a through-hole 21a serving as a measurement hollow communicating with the measurement opening part 11f, and the through-hole 21a has a recess 21b for holding fixed-point metal leaking from the fixed-point crucible 11.