Thursday, February 1, 2007

Hopkins & Davies wanted; Cribb found

I found two other named condensers, again a name of which I can not find the person.

A final Round-up on the condensers. (see previous post for additional links to pictures of the condensers.

Felix Richard Allihn (1854 – 1915)
German glassblower made the bulb reflux condenser at the firm Warmbrunn, Quilitz & Co in Berlin.

Otto Dimroth (1872 – 1940)
German chemist invented the reflux condeser with an internal double spiral for cooling to have the inlet and outlet at the top of the condeser. He is also known because of the Dimroth rearrangement.
Über intramolekulare Umlagerungen, Liebig's Ann. Chem. 1910, 373, 3, 336

Fritz Walter Paul Friedrichs (1882 – 1958)
German chemist. Invented the reflux condeser with the spiraled cold finger.

Some new forms of laboratory apparatus; JACS, 1912, 34 1509

Thomas Graham (1805–1869)
Scottish physical chemist. Also known from Graham’s law of diffusion. Invented the distillation condenser with the helical condensation pathway.

Cecil Howard Cribb (1864 – 1932)

Brittish chemist, described this double surface Cribb condenser in 1898.

A new form of condenser, Analyst, 1898, 23, 119 - 122

Hopkins condenser
Unable to find out which Hopkins this man was. Named a vertical distillation condenser.

Davies condenser
Unable to find out which Davies this man was.

Named an improved version of the Cribb condenser.

(You may think I have a named-glassware fetish now)

5 comments:

Russ said...

How about Franz Ritter von Soxhlet, of extractor fame? Watching that thing in action is hypnotic - almost like a lava lamp.

Ψ*Ψ said...

een of andere vent: my glassware fetish is not limited to named things, it knows no bounds :)
russ: i've spent hours watching soxhlets during slow weeks at work in which few samples arrived

synthetic environment said...

I wish I had access to Dingler's Polytchnisches journal and read Die gewichtsanalytische Bestimmung des Milchfettes by F. von Soxhlet, never used it though.

Distillation and reflux is real art.

Anonymous said...

Got a better image of the Freidrichs condenser? I can't really make sense of that one. How does it differ from a Graham condenser?

Anonymous said...

Doesn't matter, I just found some good images on this page:

http://www.sigmaaldrich.com/catalog/search/TablePage/17185332