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And now for something not completely different...

...but different nonetheless.

After all that artillery instrument stuff, I have something for you crunchies.

The Musketry Rule Model 1917.

This one is currently missing its 15 inch string. The string terminated with a brass ring. You held that ring at your chin (or in your teeth), pushed the rule out until the string was taut, and you would then use the scale to measure horizontal or vertical angles. Which you could then use the WRM formula to convert to ranges, etc, to calculate sight settings for rifles firing the 30.06 US round. Similar devices were used for machineguns, the Arsenal of Argghhh! holds at least two versions of the one developed for the Vickers HMG.

Here's the flip side.

The hole just to the left of the cutout is where the string attached.   I'll attach a more detail description of use later.


Perhaps the string learned well and went on to bigger and better things...
Nifty little gizmos.
 Christmas must have been slim pickings when you were a boy, now more exciting I think. BTW.....Got Panzer Leader?
 I'm a boatsailor,still,I love this place!
Way too complex an instrument for the majority of the grunts I have partnered with.. 
Someone had way too much time on their hands.
Ahhhhh. Edited Neffi to irrelevance. 
True dat, John! But I thought it was kinda funny given the 'ahem' original post... as is the 5000 yard aiming conversion on that instrument.
I'd like to see the ballistic trajectory chart for 30.06 at 5000 yards, talk about a Bell curve!
How long does it take you to perform your annual inventory?  I hope THAT is automated?!  Heh
 There was a similar gadget issued with the rifles used by Berdans in the Civil War.  A little card with a wedge shaped slot in it, a slider, and a scale.  Hold the bead in your teeth, frame the man in the slot (I think it was calibrated for a man 5' 8"), move the slider, then read the range on the scale.
Joe is referring to the "Stadia" which was also used as both an award and a uniform item for marksmanship around that time. 

I think there is another model sort of half way between the stadia and the 1917 Musketry Rule in terms of simplicity and quality of construction.  I am sure that our host will show us all in due time-  with cat hairs for scale.
THANK YOU, John (nta).  I was at work when I posted that and I just drew a blank on the proper word.  Here is an example of one that was given as a prize  for marksmanship:
 J(NTA) I am aware of the Models 1916, 1917, and 1918.  I've only got (for now...) the M1917.
 A similar gizmo has been around for centuries, originally supposedly for desert navigation, still used for sea-kayak navagation, callled a Kamal.
Hey Joe in N. Calif, that link didn't work (403 error), but this one should.

Odd, it did work for me.  But yours is better - the whole article, not just the photo.
 Always cool seeing the neat stuff you have, would be fun to use in preparing a defensive position today. I remember while watching one of the other guns in our battery shoot during a direct fire competion using a slide rule and stop watch to calculate the range to the targets. We won that year....