Barra Rangefinder - Strood with 4.5 foot base

Another rangefinder developed in 1905. An ingenious system. In order to determine the distance to the target, you need to combine the two halves of the image into one whole with a special pen.
Initially, this rangefinder was part of one of the Russian batteries of the Moonsund archipelago, where it was captured by the Germans in October 1917. In 1945, as a trophy, it was returned to its homeland from some German museum.