Mariner's Astrolabe, full scale, AON

[druxey]

As long as you don't navigate yourself onto any rocks.... That is pretty good accuracy, Alan. Well done!

[AON]

My last posting for this build.

An early quadrant.

first my inspiration

 

then my finished 3D print.  I used a Japanese 50 Yen piece for the weight as it already has a hole in it and I didn't want to deface a coin.  The string is eye spliced at both ends, the upper part passes through a hole and flips over the post.  The lower is spliced through the coin.  The inset images are the sun and the moon.

 

 

And that's all for this build.

Thanks for visiting.

Edited August 7, 2022 by AON

[bruce d]

Alan, you have made something very nice, well done. Also, you may have started something.

Here is an astrolabe that was illustrated and described in the Nautical Research Journal vol 2, issue 1 (1950):

 

 

An astrolabe is not on my to-do list (well, ok, you got me thinking about it), but there is an equinoctial sundial creeping up the queue.

 

Bruce

[AON]

Thank you Bruce!

The NRJ article in vol 2, issue 1 (1950) by L.H. Harding is an interesting read.

[bikerbob]

Good Day Sir

As a model ship builder I am interested in all things nautical. I was searching info on astrolabes when your thread appeared. I see you worked in 3D; would it be posible to email me  2D acad drawings of the astrolabe for me to construct my own.

Thank you

Robert Wager

email Bikerbob@magma.ca

[AON]

Hello Bob,

You missed a good Model Shipwrights of Niagara meeting yesterday.

Would you be building yours in metal (brass or copper plate)?

What size paper can you print on?

I can make a full size 2D drawing of a front view and side view of my model quite easily and will send it to you after I discover more of what you intend and can print.

 

[AON]

Here are some drawings I made this morning.  I will email them to Bob.

As I have the free hobbyist version of Fusion 360 there are things it will not let me do so some overall dimensions (from a corner of the object to the extreme end of a radius ) are missing. 

My copper pins were from standard house wiring  (16 or 12 gauge, not sure at the moment) and the alidade (pointer), hub, and retainer cap were sanded to fit together as a friction fit.  The pointer stays where it is pointing, it does not swivel freely.

If I were doing this again I'd make the pointer a wee bit longer and my embossed number angle) a wee bit larger.

Mariner's Astrolabe Body.pdf Mariner's Astrolabe Alidade.pdf Mariner's Astrolabe Cap.pdf Mariner's Astrolabe Upper Swivel + Ring.pdf Mariner's Astrolabe Lower Swivel.pdf

Edited October 18, 2022 by AON