I'm a Spanish Physics undergrad, and I was writing a report on an experiment we did on the lab, in which we had to measure a solid's density using the so-called Westphal balance (aka Mohr balance, and in Spanish, Mohr-Westphal balance). After doing a little research on the internet, in both Spanish and English languages, I've encountered no more in the references on the history of the balance than the mention of Karl Friedrich Mohr as the inventor of the instrument, here, among other sites, and the fact that Westphal was one who improved the usage of the balance. I was capable to find the latter only here (second sentence):
Posteriormente introdujo Westphal ciertas modificaciones empleando unas pesas cuyas masas guardan una determinada relación entre sí y a su vez con la masa de un flotador cilíndrico de vidrio en cuyo interior hay colocado un termómetro.
and there's no references in the webpage of second link.
So I'm missing a few things:
- Who is Westphal, because I was unable to find a person behind this name.
- How exactly did contributed Mohr and Westphal to the development of the balance? There's practically no data on the web.
- Does somebody know anything by chance about the history of the instrument? Or does someone know where should I try to do the research?