GPS COMPUTER VS SEXTANT/ASTROLABE/Old ways/manual

[ShopShoe]

So......

Further Down the Rabbit Hole....

Amelia Earhart's navigator was using a "Bubble Octant," according to several histories and films made about her disappearance.

Does anyone know anything about that instrument?

--ShopShoe

 

[SmithDoor]

So......

Further Down the Rabbit Hole....

Amelia Earhart's navigator was using a "Bubble Octant," according to several histories and films made about her disappearance.

Does anyone know anything about that instrument?

--ShopShoe

NO
It reason I am here finding out data.

I have used Surveying equipment.

Only reading the internet.

Yes know Amelia Earhart use Bubble Octant and radio for navigation.

Dave

 

[SmithDoor]

So......

Further Down the Rabbit Hole....

Amelia Earhart's navigator was using a "Bubble Octant," according to several histories and films made about her disappearance.

Does anyone know anything about that instrument?

--ShopShoe

Back in 1960's at a EAA meeting the gust speaker selling a high price compass. Use a slide on if down in the middle of ocean. Using a compass and a watch you find location.

This basically what look like.
For longitude
1) If did not know true north find by locating north star and the difference of magnic.
2) At high noon by sun ☀ notd time on your watch using Greenwich Time.
3) Look chart on back side of compass and difference is your longitude

Ladadtue
1) Find the angle of sun at high noon use the compass by pointing it sun and lining un scale on compass.
2) Use chart on backside compass and Time year will give your Ladadtue.

Today look back and think you could hundreds of miles off using this compass.
But when 10 or 12 you think that is fantastic.

Thd speaker did talk how to make sail boat out life raff too. At less no one had to use the magic compass design Hollywood.

Today we have YouTube
I am trying the real way.

Dave

 

[SmithDoor]

Here some data on milling in a lathe making gears on a lathe.
Piston Rings too.


Dave

 

[SmithDoor]

So......

Further Down the Rabbit Hole....

Amelia Earhart's navigator was using a "Bubble Octant," according to several histories and films made about her disappearance.

Does anyone know anything about that instrument?

--ShopShoe

This is better one for Rabbit Hole for bad Aircraft. Works everytime A machine design in France.
It is also a Landlord best day ever

The aircraft cost over Hight lite between brackets for answer {- $400,000 -}

Dave

 

[Daryl_bee]

Back in 1960's at a EAA meeting the gust speaker selling a high price compass. Use a slide on if down in the middle of ocean. Using a compass and a watch you find location.
View attachment 164848
This basically what look like.
For longitude
1) If did not know true north find by locating north star and the difference of magnic.
2) At high noon by sun ☀ notd time on your watch using Greenwich Time.
3) Look chart on back side of compass and difference is your longitude

Ladadtue
1) Find the angle of sun at high noon use the compass by pointing it sun and lining un scale on compass.
2) Use chart on backside compass and Time year will give your Ladadtue.

Today look back and think you could hundreds of miles off using this compass.
But when 10 or 12 you think that is fantastic.

Thd speaker did talk how to make sail boat out life raff too. At less no one had to use the magic compass design Hollywood.

Today we have YouTube
I am trying the real way.

Dave

Interesting reading these posts.

Only partially related, I designed an Astrolabe back in 1993 (on Generic CADD) but it only got to the paper model stage (looks terribly beat up now). It was a PITA because I could not place text on a curve so had to do it letter by letter (or number) and in addition anticipate a vertical offset when the letter was printed. Like I said on my web page at the time I tested it in Canada with one plate and another in St. Lucia (I had plates for every 5deg) and in all cases it was bang-on accurate. What fantastic night skies in St Lucia! I even predicted a solar eclipse and that it would be a grazing partial. I was never able to get photogrametric plates made and lost the source design went I moved on to another job - it was on a work computer back in 1993.
http://surfin_dude.tripod.com/creative/astronomy/astronomy.html#Astrolabe

Previous to that, what got me interested in such things, was a 18” brass sundial design I did which, amongst a host of other things, tracked the sun’s progress across a map on it’s face thought each day and the course of the year. Tricky to etch an 18" dia - 3/8" thick plate or the 1/2" thick gnomen.
http://surfin_dude.tripod.com/creative/astronomy/astronomy.html#Sundial

Now, I keep it simple and use my “Yes V7” watch. Similar but better than the Prague astronomical clock. Used by NASA astronauts & Hollywood movie producers wanting to keep track of daylight. They have a successor to the V7 coming out soon. It will tell you sunrise/set, twilight, moon rise etc a whole host of other things after you program in your city (or manually if your city isn't on the infinitely long list).


No end of fun in this field!

 

[SmithDoor]

Interesting reading these posts.

Only partially related, I designed an Astrolabe back in 1993 (on Generic CADD) but it only got to the paper model stage (looks terribly beat up now). It was a PITA because I could not place text on a curve so had to do it letter by letter (or number) and in addition anticipate a vertical offset when the letter was printed. Like I said on my web page at the time I tested it in Canada with one plate and another in St. Lucia (I had plates for every 5deg) and in all cases it was bang-on accurate. What fantastic night skies in St Lucia! I even predicted a solar eclipse and that it would be a grazing partial. I was never able to get photogrametric plates made and lost the source design went I moved on to another job - it was on a work computer back in 1993.
http://surfin_dude.tripod.com/creative/astronomy/astronomy.html#Astrolabe

Previous to that, what got me interested in such things, was a 18” brass sundial design I did which, amongst a host of other things, tracked the sun’s progress across a map on it’s face thought each day and the course of the year. Tricky to etch an 18" dia - 3/8" thick plate or the 1/2" thick gnomen.
http://surfin_dude.tripod.com/creative/astronomy/astronomy.html#Sundial

Now, I keep it simple and use my “Yes V7” watch. Similar but better than the Prague astronomical clock. Used by NASA astronauts & Hollywood movie producers wanting to keep track of daylight. They have a successor to the V7 coming out soon. It will tell you sunrise/set, twilight, moon rise etc a whole host of other things after you program in your city (or manually if your city isn't on the infinitely long list).


No end of fun in this field!

I was paper from 1960's to 1995
First started with Tubocad then switch to Autocad 95. If you have copy of Autocad 95 it works great on Windows 11 64 bit.

I can see itching could problem
I had foundry patterns zinc itching for name plates. That you get at less 24x24. The SMITH logo is a zinc itching.

Like you plates looks like a lot of fun.
Just thing of making back 1500's

Dave

 

[SmithDoor]

Here few more zinc itchings I still have.

I also of the life boat compass my father purchased back in the 1960's it was draw with zinc itchings

With sight open

This had a 3x6 plastic card too. My brothers lost the card back 1960's on a hunting trip.

Dave