Subject: f/s ex-NASA star simulator/collimator
From: afeldman@gate.net
Date: 7 Jan 1997 22:12:14 GMT
NASA "surplus" Star Simulator.
Essentially this is a tubular collimator featuring a 5" coated objective lense mounted in an approx. 30
tube. Attached to the end of the tube is a lamp housing with a pin hole baffle. The tube itself is ring
mounted and attached to a heavy/sturdy rectangular base. Originally the unit was used to check and
calibrate the star finder component of missile enertial navigation systems.
I have 1 unit left for sale. Each unit is in exc. optical, mechanical and cosmetic condition and is
immediately usable as a collimator; however, other projects come to mind, e.g. high quality refracting
telescope, or binoculars? Orig. NASA acquisition cost was $3000+ for each. I will sell each outright for
$350 ea. plus shipping; swaps for other optics, nautical & military collectable, antique scientific devices,
firearms, jewelry, or?
Allen Feldman
email: afeldman@gate.net
smail P.O.B. 10367
Tampa, FL 33679-0367
ph. (813) 879-0411 (daytime EST Mon.-Thurs.)
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Oh yes, remember, the best laid plans of mice & men....
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Subject: Re: Is GPS surveying accurate to a few centimeters?
From: B S Carr
Date: Tue, 7 Jan 1997 02:12:25 +0000
In article <32CDDB9E.365B@net-connect.net>, "J. Anthony Cavell, PLS"
writes
>Maynard Riley wrote:
>>
>> Hello Dave!
>>
>> In <5adt42$l6g@sloth.swcp.com>, Dave Sims
> writes:
>> >Hi surveyors, I've got a square 40 acre property . .
>
>> That's the first assumption: . . .
>
>> >And I should be able to
> . . .
> > Very unlikely. . .
>> >With all that in mind, can I use a $400-$600 handheld GPS unit
> . . .
>> Not a chance.
>>
>> >Or
>> >can I rent a $2000-$3000 GPS unit to get the accuracy I need?
>>
>> You could . . . spend a lot of time and money.
>>
>> >This isn't a substitute for hiring a licensed surveyor
> . . .
>> Really!?
> . . .
>> Have fun,
>>
>> ```Maynard Riley PLS Cook County Illinois USA
>> ```On-Line Resources for Land Surveying & Geomatics
>> ```http://homepage.interaccess.com/~maynard/index.html
>
>Here!. Here!
>--
>J. Anthony Cavell, PLS _____ _____
>http://www.net-connect.net/~gpsman/ /_____ / / @ \ /____ /
>Navigation Electronics, Inc. /_____ /===(@ % @)===/____ /
>200 Toledo Drive /______/ \ @ / /_____/
>Lafayette, LA 70506
>
just a thought has anybody heard of glonas, apparently a system which
receives the best of gps along with the best of the russian equivalent
system to achieve a sub meter accuracy without differential input by
tracking 17 or so satellites at a time. (unfortunatley well over the
suggested budget though)
--
B S Carr
Subject: Re: Football Surveying
From: acresurvey@aol.com
Date: 8 Jan 1997 05:40:53 GMT
In article <32CEB97B.3390@iglou.com>, Ed Robinson
writes:
>Why does the NFL, NCAA and high school football regs still use the old
>chain gang stuff for measuring first downs ??
>
>Can't they just shoot a laser beam from one side of the field to the
>spot on the other and see if the football crossed the beam.
My guess is:
1) Tradition
2) Visual evidence that can be easily seen by the spectators and cameras
3) The field is not flat, except at some indoor venues
Jon Tabas, PE, PLS
Langhorne, PA
ACRE Engineers and Land Surveyors was established in 1984. We provide
Consulting Services, Civil Engineering Design and Land Surveying Services
to individuals and companies in Southeastern Pennsylvania and Southern New
Jersey. The firm is owned and operated by Jonathan J. Tabas, PE, PLS.
Mailing address: P. O. Box 600, Feasterville, PA 19053-0600 TEL: (215)
752-2000
Subject: Re: autocad dotted font
From: magrls@netzone.com (Matthew A. Graham)
Date: Tue, 7 Jan 1997 18:44:14 MST
In article <32D16815.2A5F@micron.net> BPorter writes:
>From: BPorter
>Subject: autocad dotted font
>Date: Mon, 06 Jan 1997 13:01:09 -0800
>I'm looking for a font that will produce the dotted look (sort of a
>screen) for lettering on records of survey for background records
>information calls. Can anyone tell me where, or if, that font might be
>available ?
Haven't seen a font that does that, but depending on what your plotting
with, you can change the line color to plot a grayed out line similar to what
you describe. Colors 8 and 9 (light and dark gray)appear hatched on my DeskJet
and on the electrostatic plotters my service uses.
Matt
magrls@netzone.com
