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#451 clamchip

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Posted 13 March 2018 - 10:56 PM

Submarine Periscope manual, look at this complex apparatus, Wow!:

https://maritime.org...scope/index.htm

 

Robert


Edited by actionhac, 13 March 2018 - 11:16 PM.


#452 punk35

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Posted 17 March 2018 - 08:46 AM

About ten years ago, my friend and I were at an auction, and he bought the “unwanted” box of stuff for a dollar. Inside the box was an old astronomy textbook that he gave to me. I think it’s pretty interesting and you may too. Some photos of some of the most interesting things inside:

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#453 punk35

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Posted 17 March 2018 - 08:48 AM

More

Edited to add: Besides the sky maps that are inked in blue, this is the only colored page in the book.

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Edited by punk35, 17 March 2018 - 09:05 AM.

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#454 punk35

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Posted 17 March 2018 - 08:49 AM

More

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#455 punk35

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Posted 17 March 2018 - 08:50 AM

Still more 

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#456 punk35

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Posted 17 March 2018 - 08:51 AM

Another 

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#457 punk35

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Posted 17 March 2018 - 08:56 AM

And

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#458 punk35

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Posted 17 March 2018 - 08:57 AM

One more 

Edited to add- Enjoy!smile.gif

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Edited by punk35, 17 March 2018 - 08:58 AM.

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#459 tim53

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Posted 17 March 2018 - 10:41 AM

Wow.  My house was only a year old when that was published. 


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#460 respite

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Posted 17 March 2018 - 08:07 PM

Super cool book. The author is apparently not related to one of the wildest women in American history by the same name.


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#461 Jim Curry

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Posted 19 March 2018 - 08:30 PM

Wow.  My house was only a year old when that was published. 

Judging by your beard I woulda guessed you were too.  smile.gif


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#462 clamchip

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Posted 24 March 2018 - 08:33 PM

I was thinking today, now I have bench testing capability with my Double Pass Auto Collomation

apparatus, maybe I can 'fine tune' my Eugen Popp Maksutov.

This scope gave me fits, adjusting this, shimming that, I felt I needed a more scientific approach.

Its performing pretty excellent, but I'd like to squeeze it a little harder, I'll bet there's more, and I think

the bench and DPAC is just what it needs.

I'm not sure what to even look for, I thought I would just set it up just as I did in the following photos

of my B&L 4000, and see if I can recognize anything that looks out of place.

Top photo is the 5.5 inch f/16 Swiss made Eugen Popp MCT, and a few photos of my DPAC with 

the B&L 4000.

Robert

 

post-50896-0-71623000-1476753324.jpg

post-50896-0-49204200-1494286674_thumb.jpg

post-50896-0-66948100-1494286689_thumb.jpg

post-50896-0-02001300-1494286730_thumb.jpg

post-50896-0-72324100-1494290535_thumb.jpg

 


Edited by actionhac, 24 March 2018 - 08:36 PM.

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#463 clamchip

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Posted 28 March 2018 - 12:07 PM

I was going through my photos and I think I forgot to mention I bench tested my Lower 4-1/4 inch f/13

I'm not sure if anyone remembers the Lower photo equatorial, it's the scope with the level platform.

The levels are for calibrating the setting circles and setting up the mount.

The lens looks very nice. Oh all except for the clam chip. 

Robert

 

lower 007.jpg

Lower 4.25 inch 010.jpg

post-50896-14074121153822_thumb.jpg

post-50896-14074121370342_thumb.jpg

post-50896-14074120276609_thumb.jpg


Edited by actionhac, 28 March 2018 - 12:11 PM.

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#464 John Higbee

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Posted 29 March 2018 - 10:38 PM

I was lucky enough to acquire a SkyTent portable observatory recently.  This is in the midrange of the models SkyTent offered (10 feet in diameter, and 8.5 feet tall at the center of the dome).  It's large enough to comfortably house either the C14 Orange Tube, or the Cave 12.5" Model D.  I'm now spending more time at our place on Virginia's Northern Neck (Bortle 3-4 dark skies), and decided to bring it down last weekend and set it up...this marks the formal establishment of Ophelia Observatory!

 

The SkyTent comes packed in three large bags...two for the framework pieces, one for the heavy duty vinyl covers (one for the dome, one for the drum).  There are a lot of pieces - this picture shows some of them, along with part of the drum framework assembled (framework is six feet tall):

 

20180327_104036.jpg


Edited by John Higbee, 30 March 2018 - 04:09 AM.

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#465 John Higbee

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Posted 29 March 2018 - 10:41 PM

This shows the drum framework, and part of the dome framework assembled: 

 

20180327_113538.jpg


Edited by John Higbee, 29 March 2018 - 11:18 PM.

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#466 John Higbee

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Posted 29 March 2018 - 10:49 PM

Dome framework completing (dome rotates via a ring supported by eight Delrin bearings)...smooth as silk!  Just for the record, the stepladder is a Costco product, even though it has exactly the same "white with black trim" style as the framework.

 

SkyTents are designed well and robustly structured...frame is cross-braced to a fare-thee-well, and the vinyl is heavy marine-grade.  The few that the company made before ceasing production stand the test of time well - mine is ~ 20 years old and still in great shape.

 

20180327_113618.jpg


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#467 John Higbee

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Posted 29 March 2018 - 10:52 PM

Drum wall vinyl installed.  Note the triangular window on the open door; there is an identical window on the drum panel opposite the door for cross ventilation. 

 

The interior surface of the vinyl is dark blue - keeps extraneous light from coming through the walls and the dome, and, with the white outer surface, helps keep the inside of the SkyTent cooler on hot days:

 

20180327_115900.jpg


Edited by John Higbee, 29 March 2018 - 10:57 PM.

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#468 John Higbee

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Posted 29 March 2018 - 10:59 PM

SkyTent completed...

 

20180327_123953.jpg


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#469 John Higbee

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Posted 29 March 2018 - 11:10 PM

...and with happy owner emerging!

 

20180327_121238.jpg

 

Spent the balance of the day washing down the dome and wall vinyl (was puzzling on how to get the top of the dome done, until Carol (the smart one on this team) suggested I use a Swiffer cleaner to reach those areas).  Finished up by ArmorAlling the exterior once it dried (recommended on an annual basis).  It's now ready to host a telescope!

 

For those who are wondering how it is restrained from "blowing away", there are eight 10" steel stakes that engage eight holddown rings on the drum framework.  The manufacturer stated that the structure was rated for 75 knot winds (don't intend to test that claim...)

 

Took about 2.5 hours to assemble the first time.  One person could do it (if pressed)...two are better.

 

John


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#470 John Higbee

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Posted 29 March 2018 - 11:27 PM

Submarine Periscope manual, look at this complex apparatus, Wow!:

https://maritime.org...scope/index.htm

 

Robert

Ah...the classic Type II periscope...a mainstay of WWII fleet boats and nuclear submarines alike.  I've spent hundreds of hours over the course of my career gazing through Type IIs at many interesting things!

 

John



#471 steve t

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Posted 30 March 2018 - 09:30 AM

...and with happy owner emerging!

 

attachicon.gif 20180327_121238.jpg

 

Spent the balance of the day washing down the dome and wall vinyl (was puzzling on how to get the top of the dome done, until Carol (the smart one on this team) suggested I use a Swiffer cleaner to reach those areas).  Finished up by ArmorAlling the exterior once it dried (recommended on an annual basis).  It's now ready to host a telescope!

 

For those who are wondering how it is restrained from "blowing away", there are eight 10" steel stakes that engage eight holddown rings on the drum framework.  The manufacturer stated that the structure was rated for 75 knot winds (don't intend to test that claim...)

 

Took about 2.5 hours to assemble the first time.  One person could do it (if pressed)...two are better.

 

John

Very cool.

Back in the 1990's, I remember seeing one of those on display at the old Astrofest south of Chicago. 

Steve T 


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#472 terraclarke

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Posted 30 March 2018 - 10:43 AM

Submarine Periscope manual, look at this complex apparatus, Wow!:

https://maritime.org...scope/index.htm

 

Robert

Run Silent, Run Deep! Dive, Dive!! Aooooooogah, aoooooooooogah!! :klaxon horn sounding and bells,ringing:

 

http://youtu.be/9azjzhoL670


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#473 deSitter

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Posted 30 March 2018 - 12:43 PM

Run Silent, Run Deep! Dive, Dive!! Aooooooogah, aoooooooooogah!! :klaxon horn sounding and bells,ringing:

 

http://youtu.be/9azjzhoL670

When I was a kid, I wondered how they got 200 feet of periscope into 40 feet of submarine, and how the optics worked etc. I had no idea that a sub was barely submerged when using the periscope. In fact U-boats would usually surface for their attacks!

 

-drl


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#474 steve t

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Posted 30 March 2018 - 01:45 PM

When I was a kid, I wondered how they got 200 feet of periscope into 40 feet of submarine, and how the optics worked etc. I had no idea that a sub was barely submerged when using the periscope. In fact U-boats would usually surface for their attacks!

 

-drl

My wife said the first time I installed a new kitchen faucet, reminded her of depth charging in an old  WW II submarine movie with water spaying everywhere.

Steve T 


Edited by steve t, 30 March 2018 - 01:46 PM.

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#475 deSitter

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Posted 30 March 2018 - 03:52 PM

...and with happy owner emerging!

 

attachicon.gif 20180327_121238.jpg

 

Spent the balance of the day washing down the dome and wall vinyl (was puzzling on how to get the top of the dome done, until Carol (the smart one on this team) suggested I use a Swiffer cleaner to reach those areas).  Finished up by ArmorAlling the exterior once it dried (recommended on an annual basis).  It's now ready to host a telescope!

 

For those who are wondering how it is restrained from "blowing away", there are eight 10" steel stakes that engage eight holddown rings on the drum framework.  The manufacturer stated that the structure was rated for 75 knot winds (don't intend to test that claim...)

 

Took about 2.5 hours to assemble the first time.  One person could do it (if pressed)...two are better.

 

John

Very nice device

 

-drl




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