# Source material on how Planck came up with h

1. Dec 4, 2008

### marcus

I found a facsimile of the original article where Planck gives a value for h
(except that in May 1899 he was calling it b, instead of h.)
http://bibliothek.bbaw.de/bibliothe.../index_html?band=10-sitz/1899-1&seite:int=454

Here is the exact page where he gives his estimate of the value of h, or rather "b" as he calls it.
http://bibliothek.bbaw.de/bibliothe.../index_html?band=10-sitz/1899-1&seite:int=494

6.885 x 10-27 cm2gr/sec

pretty close. lovely. slightly mysterious. May 18 1899
no time to comment, have to go out.

Last edited: Dec 4, 2008