New ways vs Old ways CNC vs manual

[SmithDoor]

Remember when needs the let's use the Sextant with helper.

It work 200 years still works today

Dave

 

[Richard Hed]

Sounds like you where in Construction at one time .

Dave

Well, a bit of construction. I designed our house in Phils, and supervised the construction. I learned a whole lot. It's hurricane proof, earthquake proof, flood resistant, and bullet resistant and bomb resistant. The last two items NOT a priority but the first three extremely important. It is also built with a basement which is generally about 10-15degrees cooler than upstairs.

 

[SmithDoor]

I had difficulty finding the sun when I used the sextant - once - when in the Navy.
Decca navigator was dead easy though! Radar over the horizon was difficult to interpret if it didn't see houses or cliffs on the coastline, but only hills and mountains beyond? Dead reckoning was OK for the ship through water, and tidal flow, but wind drift was bit of a sod to estimate! And recognising your position on a strange new coastline was difficult, so we sailed to aim 25 Km North of the port (inlet or river mouth) so we knew which way to turn when we reached the coast. (South). - it was 35 miles South, so we would have hit the coast and been just out of sight (a bit foggy, 2 mile visibility) and not known which way to turn if we hadn't aimed further away than predicted error by a good chunk. Like reducing machine cuts when approaching size!
I Stuck to engine room stuff. Easier to understand big blown 2-stroke diesels!
K2

Try this 3 to 4 inch sextant.

View attachment 1643

36[/ATTACH]

 

[SmithDoor]

⫷⸻❋ project ❋⸻⫸​

.
It would hard for any to build a GPS now looking at Sextant looks easy to me when break down.
Theis group of Sextant is size for most shops

What do you think ?

Here a few pocket Sextant from 3" to 4" dia.
Note the peep sight used
The VENEER is in minutes
Note some photos are dup. [/B] [/size]

Note the handle has a flat so does not turn in hands.

This is mostly in closed and the veneer..

Not finished

 

[Richard Hed]

⫷⸻❋ project ❋⸻⫸ ​

.
It would hard for any to build a GPS now looking at Sextant looks easy to me when break down.
Theis group of Sextant is size for most shops

What do you think ?

Here a few pocket Sextant from 3" to 4" dia.
Note the peep sight used
The VENEER is in minutes
Note some photos are dup. [/B] [/size]
View attachment 164351

Note the handle has a flat so does not turn in hands.

View attachment 164353

This is mostly in closed and the veneer..
View attachment 164354
Not finished

Wish I had some of those, even tho' I have no use for them.

 

[SmithDoor]

Wish I had some of those, even tho' I have no use for them.

I have never use too.
What found is make for every day year.
Then subtract from number in book now have the Latitude
Longitude is a reverse of a sundial and a watch aka chronometer.

Some internet sites i found took 10 pages to say that.

Dave

 

[SmithDoor]

A 3" Sextant with a veneer to 1 minute can find your self on earth .

Calculation for one minute on earth .

Earth circumference 24,500 miles

Calculation 1
(1/1) 24,500. ÷ circumference
(1/2) 360. =

degree in miles
(1/3) 68.0555555556 ÷ one
(1/4) 60. =

one minute in miles
(1/5) 1.13425925926 ÷
(1/6) 60. =

I think good for something we build in shop.

Just picture your self on a boat where you built the engine and then in your pocket a sextant you built finding your location in 1.4 miles on earth .

I think that is amazing what we can do with out. computers.

How do you feel about your talent and skills today?

Dave

FYI
one second on earth in miles
(1/7) 0.018904320988 ×
(1/8) 5,280. =
feet one second in feet on earth
(1/9) 99.8148148148