Prakāśa staṃbhanābhida Lauha of Maharṣi Bharadvāja ( A novel IR transparent material of range 5000 to 1400 cm)
This paper deals with the description and preparation of `Prakāśa Staṃbhanābhida Lauha'-a novel non-hygroscopic i.r. transparent material having a range from 5000 to 1400-1 (or 2 to 7 μ)-as described in Aṃśu Bodhinī of Maharshi Bharadvaja with a commentary by Bodhananda. The composition of constituent rew materials were mixed together in the ratio as described in the text and melted at a temperature of 265 kakṣya on an ancient temperature scale (about 9400) and then repidly poured into a dye to produce a new material which is a non-hygroscopic non-opalent greenish yellow calcium glass. It will be important to note that it is novel in the sense that most of the knonw infra red transparent materials used for prisms and windows for cells are highly hygroscopic in nature such as LiF (upto 6μ) CaF2 (2 to 8.5μ), NaCI (upto 15u) etc. and they need dry air environment for their working:
Key Words: Novel infra-red transparent material, Prakāśa Staṃbhanābhida Louha.
Indian Journal of History of Science, Vol. 30, no. 4 (1998).