nautical slide rule
 

I just found (Saturday) a US Navy nautical slide rule, marked "U.S. Navy bureau of Ships, Mark 1, Mod.O" dated 1959. Its a very neat device for time -distance speed calculations. It has two scales, one for nautical miles travelled and one for yards traavelled. I did a quick search online and found that new ones are available , as stated in other posts, for about $20. I got mine for $5 but thats the luck of the draw. At any rate, I havent used it in a mission yet but it will definately be useful. Joe S

Can you post a pic? I might be able to replicate it for printing, laminating and building one at home:up:

This ties in with what we're doing on the Real Navigation thread.

Here's a simplified model I made for use navigating. I you post a pic i might be able to make it look more authentic to the period.

TSD Computer

Mike

Better yet (for me), can you post a link? I'd be glad to just buy one.

Here is a link to a 'nautical slide rule 105', not sure if this is the same or similar device that Joe mentioned.

http://www.amazon.com/Weems-Plath-Ma...8107857&sr=8-1

The navy rule was adapted for aircraft, and is known as an e6b. Its a radial slide rule, with C and D scales, with conversion factors for all kinds of units. Plus the board let you compute wind corrections.

http://sportys.com/acb/showdetl.cfm?...roduct_id=1248

that is basically the same thing that I bought, except mine has the US navy markings. Joe s

don't these all do the same basic thing that our namograph's do?

That's quite nice. Could maybe be made in game too...

@able72 - yes it does the same as a nomograph, but offers greater accuracy

JoeS - it would be great if you posted a link to a high resolution image of your sliderule

joe

I'm at work now and will be out of town for a few days later in the week, dont know it I can get to it before next week but will do so when I can. The link posted above has a pretty good image of the device. I dont think it can be dissassembled without permanent damage. One thing that appears to be a definate advantabe is that it gives you a calculation in situations where you cant take a measurement in even minute increments. Joe S

Absolutely!
 

But the circular slide rule is more accurate than the nomograph. I don't think it's more accurate enough to result in more hits though. I'm getting plenty of hits as it is. It is a fascinating piece of history though. Slide rules are all very cool in my book. Circular slide rules are uber-cool.

I modified the one I made and added yards. Print this out with no scaling and pin the 2 wheels together to try it out. it doesn't look quite the same as the one above, but works the same.

TSD Computer.

For those who have never used this:
You line up the arrow with your speed on the outer wheel, then you can read time (hours) on the inner wheel vs distance on the outer wheel.

EXAMPLE
line up the arrow (1) with 22(kts), this is also 44000yds/hr. In 1/2 hr you will travel 11 mi or 22000 yards. in 34 hrs you will travel approx. 750 mi.

If you line up the 6 on the inner wheel with your speed, you can read the time in minutes, as the wheel repeats. 6~60~600...
Line up the 6 (60) with 8 kts. In 22 minutes you will travel approx 2.9 mi (5900 yds). You will travel 14 mi in 105 minutes.

Enjoy,
Mike

SH4 Real Navigation Thread

Here is a time speed distance computer you can print out on cardstock. (Another version of the above, this one on one sheet).

Circular TSD computer

Mike

THX Mike :up:

I'm going to make one today.:D