J.S.W Calculator--K35

[Dave White]

I have an old whiz wheel that is apparently used to calculate height
needed to cover a specified distance. I got it with my Libelle 201B.
Was just looking at it and trying to figure it out. It has a
semicircular rotating part on the front with Height Needed across the
top and a speed scale across the bottom (flat side). On the fixed
card, the outer scale is Nautical Miles to Go and there is a wind
component graph at the bottom left and upper right. It looks like I
put my speed to fly over the wind component and then read altitude
required under the desired distance. Does anyone know if that is
correct? Also, I think it's missing a piece on the back. The back of
the whiz wheel is labeled JSW Wind Component Resolver. The brass hub
is there, but there's not any moving part, which I suspect is
required. It says made in England, Copyright 1986 JS Williamson. Can
anyone give me more information about this little device?

[JS]

Think there was just one moving part on the front, operating as you
assumed.
It's also been called a Dial-A-Prayer Wheel.
I probably still have one somewhere, along with a similar dusty old
slide rule for SCUBA diving.
....Or did it get given away with the barograph, foil and camphor?
Jim

[Tim Mara]

it should have the simple instruction written right on it.......most did
simple to set the datum mark to the distance to go and read the altitude
needed (on the squiggled line for the different winds) and/or set the datum
line to the altitude you have and read the distance you can go before
striking the earth surface...pretty much works like an E6B.
tim
Please visit the Wings & Wheels website at www.wingsandwheels.com

"Dave White" > wrote in message
...
>I have an old whiz wheel that is apparently used to calculate height
> needed to cover a specified distance. I got it with my Libelle 201B.
> Was just looking at it and trying to figure it out. It has a
> semicircular rotating part on the front with Height Needed across the
> top and a speed scale across the bottom (flat side). On the fixed
> card, the outer scale is Nautical Miles to Go and there is a wind
> component graph at the bottom left and upper right. It looks like I
> put my speed to fly over the wind component and then read altitude
> required under the desired distance. Does anyone know if that is
> correct? Also, I think it's missing a piece on the back. The back of
> the whiz wheel is labeled JSW Wind Component Resolver. The brass hub
> is there, but there's not any moving part, which I suspect is
> required. It says made in England, Copyright 1986 JS Williamson. Can
> anyone give me more information about this little device?
>
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