An instrument for calculating min levels of radiant heat particularly in some other part of the spectrum called also actinic balance thermic stability
- a musical instrument that measures heat radiation; acutely painful and sensitive
- a musical instrument for calculating minute degrees of radiant heat, especially in some other part of the range; -- labeled as additionally actinic balance, thermic stability.
(n.) A guitar for calculating moment quantities of radiant heat, especially in various areas of the range; -- labeled as also actinic balance, thermic balance.
The infra-red requires special appliances; it has been examined visually by the help of phosphorescent plates (Becquerel), and with special photographic plates (Abney); but the most efficient way is to use the bolometer or radiomicrometer; by this means some 500 or 600 lines have been mapped.