Handbook of the Rangefinder Infantry No 2 (Barr and Stroud), 1933

If you have a rangefinder in your collection, or perhaps in your sphere of research, then this handbook will help you understand the complexity of it: very!

You can of course watch our series on YouTube as well https://www.youtube.com/playlist?list=PLdJVnNwvpcfWcWkKbb3cP1dSjW5Fe8V23