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Article #2115Re: Tachometers
From: Iskandar Taib
Date: Thu, 28 Jan 1993 16:28
Date: Thu, 28 Jan 1993 16:28
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2444 bytes
In article <C1F6oC.18I@hpchase.rose.hp.com> jahr@hprnd.rose.hp.com (Steve Jahr) writes: >Iskandar Taib (ntaib@silver.ucs.indiana.edu) wrote: >: Hmmm >: >: I think this is backwards. The filament of an incandescent lamp >: doesn't have enough time to cool down enough between cycles, so >: it should glow steadily. A fluorescent lamp, however, relies on >: the flow of electrons through a mercury vapor through the tube, >: and this can respond faster to the cycles of AC. >: >: Whether they flash 60x per second or 120x per second I don't know. > >Ok... I've got one and I've tried it. In TFM the calibration mode is >claimed to work on incandescent lights. But it works on both types equally >well. The way I figure, it is a pretty sensitive bugger. But then >I suppose it has to be to "see" the prop without any backlighting or >anything. I just remembered that in my photography days it was emphasized that one should use a shutter speed of 1/30 sec or less (i.e. 1/15, 1/8 etc.) when shooting under fluorescent lights because it flashes and at a faster shutter speed you might miss a flash. I had a picture I took of a fluorescent light where I intentionally moved the camera- you could see 4-5 distinct images of the fluorescent light tube. The funniest mistake (not a typo) I've ever seen in a newspaper had to do with fluorescent light ballasts, which according to the Indiana Daily Student, were the "weights used to hold down lights on campus". Got a free CD off that too.. sent it in to Robert Conrad's Weekend Radio from Cleveland - they have a "media faux pas" contest every week. -- ------------------------------------------------------------------------------- Iskandar Taib | The only thing worse than Peach ala Internet: NTAIB@SILVER.UCS.INDIANA.EDU | Frog is Frog ala Peach Bitnet: NTAIB@IUBACS !
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Newsgroups: rec.models.rc Path: arc1-ca.pugleaf.net!sparky!uunet!destroyer!sol.ctr.columbia.edu!usenet.ucs.indiana.edu!silver.ucs.indiana.edu!ntaib From: ntaib@silver.ucs.indiana.edu (Iskandar Taib) Subject: Re: Tachometers Message-ID: <C1KoFz.6wn@usenet.ucs.indiana.edu> Sender: news@usenet.ucs.indiana.edu (USENET News System) Nntp-Posting-Host: silver.ucs.indiana.edu Organization: Indiana University References: <C1E7t9.G82@usenet.ucs.indiana.edu> <C1F6oC.18I@hpchase.rose.hp.com> Date: Thu, 28 Jan 1993 16:28:46 GMT Lines: 39