So. Have made the thing, with enough gear left over to make an onmimeter too - Thanks to everyone who took the time to make and upload these files - and thanks to Don and Hitman for this little gem, which is going to be extremely useful....
Quote:
Originally Posted by don1reed
One last item from my corner:
Do the Math.
I observe thru the scope a Hakusika Maru: Aspect Ratio 4.6 from the book.
Aspect Ratio thru the scope:
4.25 tics high
13 tics long.
Do I break out my hh electronic calc ? No, I reach for the SACF/IW:
Since the SACF is a cicurlar sliderule (logrithmic) with a sine scale:
As you can see, 25.1° falls beneath 4.25, the height of the target ship, so I then rotate the center disk to place the 25.1° mark under 13, dividing 4.24 into 13. The answer is read above the sine of 90° = 3.05, the observed Aspect Ratio.
I can now proceed to compare the two AR's to obtain my Angle on the Bow with the SACF.
4.6 : 90° : : 3.05 : 42°
Simple and fast
EDIT NOTE: Had to goto photobucket, ImageShack is having a bad day. |