>We found that you can buy wire-wound ceramic resistors on hollow cores
>which work very well as tube heaters. They are extremely cheap (a few
>bucks a shot) and easily go up to 600 oC.
>
>We used 100 watt, 25 ohm resistors. They eventually burn out because the
>glassy insulation melts and they short. Wrapping them in asbestos tape
>or cement lengthens the life somewhat.
>
>They cost about $10 each.
>
>                                        Henry
>-----------------------------------------------------------------------------
>Prof. Henry Schwarcz                            Tel: (905)525 9140 x24186
>University Professor
>Dept. of Geology                                Fax: (905)522 3141
>McMaster University
>Hamilton, Ontario, L8S 4M1                      email: [log in to unmask]
>Canada
>-----------------------------------------------------------------------------

Henry,

That sounds like a good idea - where do you get these?

Hal

Dr. Haraldur R. Karlsson
Associate Professor
Department of Geosciences
and Department of Chemistry and Biochemistry (Joint)

Mailing Address:
Department of Geosciences
Box 1053,Texas Tech University
Lubbock, TX 79409
USA


Phones -  (806)-742-3130 	Office
          (806)-742-3112 	Stable Isotope Laboratory

Fax -     (806)-742-0100

world-wide-web: http://www.ttu.edu/~geosc/