NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: R: Re: C. Plath Bubble Horizon
From: R B Emerson
Date: 2008 Aug 11, 10:53 -0400
From: R B Emerson
Date: 2008 Aug 11, 10:53 -0400
Mille grazie! This is precisely what I was hoping for! :-D I'll give
W&P a call to see if they can help with the eye piece as well,
although I have my doubts on that score. Still, I'm not that far from
them so it's easy enough to do. Again, many thanks for your help.
SPOILER ALERT
BTW, I plugged the data from your father's notes (nice group of sights!) into calculators running StarPilot and was interested to see the difference (TI-86 (V1.55) and TI-92+ (V2.05) - 6.13 nm and 6.11 nm respectively) in the distance from the fixes to EP. Working through the data also gave me a chance to refresh my recollection of how each version works.
FWIW, I came up with 27-22.7N 123-39.4E for the fix.
Rick Emerson
S/V One With The Wind
Federico Rossi wrote:
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SPOILER ALERT
BTW, I plugged the data from your father's notes (nice group of sights!) into calculators running StarPilot and was interested to see the difference (TI-86 (V1.55) and TI-92+ (V2.05) - 6.13 nm and 6.11 nm respectively) in the distance from the fixes to EP. Working through the data also gave me a chance to refresh my recollection of how each version works.
FWIW, I came up with 27-22.7N 123-39.4E for the fix.
Rick Emerson
S/V One With The Wind
Federico Rossi wrote:
Rick, some years ago I owned a Plath bubble horizon that I later sold on eBay. Among my nav files I've found this instruction manual that someone emailed me. I'm attaching it, hope it can help you. Federico -----Messaggio originale----- Da: NavList@fer3.com [mailto:NavList@fer3.com] Per conto di Richard B. Emerson Inviato: lunedì 11 agosto 2008 2.04 A: NavList@fer3.com Oggetto: [NavList 6106] Re: C. PLATH BUBBLE HORIZON Bump - I'm still looking for some help with the points raised below. Rick Emerson S/V One With The Wind RBEmerson wrote:I'd like to branch this topic and ask about the older "full monty" Plath bubble horizon. I have one and I've got some questions about it. First, the rubber around the eyepiece (call it an eyecup, I guess) is basically on its way out (dried out and crumbling along a part of the edge) - can anyone recommend a reasonable (good fit and costs less than a new sextant ;-) ) replacement? Second, except with the solar filter over the objective, the bubble is simply too dim to be seen when shining a bright LED flashlight down through the opening for the bulb. Even then, the image is very dim. Advice on living with the bubble horizon, in general, is welcome (anyone got a PDF of the instructions?). (The battery compartment in my Plath still needs help, thanks to a less than attentive prior owner - hence the test with a flashlight) I bought the unit as part of a sextant sold on eBay some time ago (well over 5 years ago at least). In retrospect, this may have been something of a con job gone wrong as the sextant may well have been the Soviet SNO/CHO clone, sold as a Plath (what did I know?), but the bubble horizon is a for-real Plath horizon, bought for peanuts (I sold the sextant and the buyer didn't gripe - no hurt, no foul, I guess). On Jul 3, 5:24 pm, Ken Gebhart <GEBH...@CELESTAIRE.COM> wrote:Joel, About five years before C. Plath went out of production (say 6 years ago?), they came out with abubblechamber which did not have the adjusting mechanism. As I recall, it had an internal battery, and did not rely on the batteries in the sextant handle. I also seem to recall that the light had no adjustable rheostat either. I asked them why they omitted these desirable features. They replied that they were made to milspec, and that's what the specs said. They were very expensive too, about $1700. I believe this is the unit you have. Their previous adjustable bubbles were very nice, and dated nearly back to WWII. I don't know when they were discontinued. Ken Gebhart [...]
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