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davesmith1800 <davesmith1@...> added folder */9) Lubrication and cutting oils* *Description:* This for 1) Lathe and Mill oils and grease need 2) Cutting Oils 3) Water coolant

*Herd few photos of a Bubble Sextant sometimes know as Bubble Octant too. Used main in Aircraft some times on land* *Used atless into 1950’s. This style I do not know how long it was around .* *Note

Sounds great too It will work too. It bouns that makes work to a senceres like you said a mini metal detector and time. When purchased the first I play around with aluminum Found about 18"? drop I

Voltage would be pretty low, but I'll bet the current is pretty good. 200mm long pipe, not cm.

Should figure out how to measure the induced voltage. Would be a cool addition to the demonstration.? Bill in OKC? William R. Meyers, MSgt, USAF(Ret.) Aphorisms to live by:Good judgement comes

I know feeling of Harry Potter magic wand and dropping ball. Back in 1970’s when first purchased it I would be ok for cast iron wheels and if work i would be happy. I was very surprised how well it

You need to make a chart for ceramic bearing balls. *Blacksmith use for long time.* *The machinist hammer ball is used for hardness too.* *The one purchase in 1970’s the patten was in not losing

Any charts for ceramic bearings so you don't need to worry about magnetism? BTW, I did a demo of magnetism with non-magnetic materials. Dropped a strong magnet through 200cm of 10mm copper tube.?

*Remember the surface being bounced test needs to clean of oil , any coating and Degaussing.* *This note is not on drawings*

Update include at bottom knots and km.

Chart on degree vs miles and time vs miles

If ever break a tap here a low cost

I agree ? *Thank you for bringing the time up.* It surprising what how far lust one minute off is at the equator. Calculation 1 Diameter at equator (1/1) 24,500. ÷ (1/2) 24. = One hour at

*?*?How Accurate does a?*?* *?*?Celestial Fix need to be?*?* *This also includes GPS ?* Part 2 of 2 ? Celestial navigation is used when you are far out at sea, when no other

Need a good watch if you want latitude and longitude.

*?? Sextant vs GPS ??* Part 1 of 2 GPS is the most accurate around 40 inch or 1 meter. The drawback list. * Satellite ? and other countries take out * Satellite and space debre * Sun