Stadiametric Range Determining System http://en.wikipedia.org/wiki/Stadiametric_rangefinding
What are Strich and how do I use them?
A strich is an imaginary line, or subdivision. There being four sub divisions between all triangle tips (in fact, the large triangle is four strich high by four strich wide, and the smaller triangles are two strich high by two strich wide).
T.Z.F. 9b Ranging Formula
Take a known width or length of the target, divide it by the number of Strich it takes up in the gun sight reticle, and then multiply by 1000.
Known width (or side length) of target hull (in Metres)
_____________________________________________ x 1000 = Distance (in Metres)
Number of Strich taken up in the sight reticle
Once you have calculated the distance, you rotate the Tiger's range scale to the value you have calculated, and fire "BANG" !
Still not sure? Here are a couple of examples:
T-34 = 3 Metres wide.
If the T-34's front profile takes up 4 strich on the reticle (head-on facing you, or running away, LOL)
- x 1000 = 750
Distance of T-34 is 750 Metres
T-34 = 8 Metres long (lengthwise).
If the T-34's side profile takes up 4 strich on the reticle
- x 1000 = 2000
Distance of T-34 is 2000 Metres
Quick rule of thumb
A T-34 which fits face on within the large triangle is 750 Metres, again, if it fits within the small triangle it is 1500 Metres away.
Practice makes perfect !
Just like the WWII Tiger crew's, it will become second nature for you to calculate these distances, with a little practice you won't even have to think about it !
Page 88 ( a fitting page number LOL) of the Tigerfibel - English translation version
Tigerfibel is located at: http://tiger1.info/fibel/