Hi Kurt, A pen light would give a continuous spectrum (actually a black body distribution) and not show calibration lines. A good source for calibration lines is a neon bulb running on AC current as might be found on many kitchen appliances to indicate that they are on. There are many lines in the red portion and a few dim ones toward the green. As you want the source to be as stellar as possible mounting it a ways away on a nearby wall will reduce the "glow" size. Picking a bright hot star with plenty of emission lines will also serve as a rough calibration. I have many times thought of an objective prism for the telescope ala, Henrietta Leavitt and Anne Jump-Cannon. Jerry Foote ScopeCraft, Inc. 4175 E. Red Cliffs Dr. Kanab, UT 84741 435-216-5450 jfoote@scopecraft.com
Jerry, for convenience, how about one of those small house-current continuity testers? They typically have a neon bulb, and a lamp cord coud be spliced onto the contact leads. These testers usually cost only a dollar or two. On Thu, Jun 5, 2008 at 4:18 PM, Jerry Foote <jfoote@scopecraft.com> wrote:
A pen light would give a continuous spectrum (actually a black body distribution) and not show calibration lines. A good source for calibration lines is a neon bulb running on AC current as might be found on many kitchen appliances to indicate that they are on.
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