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Hi Jose!
I use a tube cracker that is a combination of the Coleman (1981) and
Caldwell et al. (1983) designs (see references previously mentioned by
Andrea Lini). I buy glass ball-and-socket joints from Kontes and have them
make some minor modifications (although any glassblower could do it too).
I have the end of 18/7 ball joint sealed, and a 3-mm-thick, 10-mm-diameter
fritted glass disk inserted in the 18/9 socket joint. The tube cracker
accepts 6-mm O.D. glass tubes that are about 170 mm long. The
ball-and-socket joint is greased with Apiezon L and secured with a pinch
clamp. The open end of the socket joint is attached to the mass
spectrometer inlet with an Ultra-torr Cajon connector rather than an Ace
Thread connector.
E-mail me directly if you are still interested in dimensions and Kontes
part numbers.
Steve
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Stephen S. Howe Office: (518) 442-5053
Dept. of Earth & Atmos. Sciences Stable Isotope Lab: (518) 442-4471
Earth Science 352B FAX: (518) 442-5825
University at Albany E-mail: [log in to unmask]
1400 Washington Avenue http://www.albany.edu/geosciences/sshowe.html
Albany, NY 12222-0001
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