USSR Russian Slide Rule Circular KL-1. On the face there is a mobile dial with two scales: the main scale B and a scale From squares. On the back there is a motionless dial with three scales: a scale of R of return sizes and two trigonometrical scales of S and T (designated on the ruler).
The mobile dial rotates by means of a head 1 with a black point. The head 2 with a red point rotates at the same time two arrows: an arrow 3 on the face and an arrow 4 on turnaround.
These shooters play a role of the bilateral vizirny line, allowing to compare at once all scales of a ruler. Besides, on the face over the mobile dial the motionless index 5 which always notes the provision of the beginning (number 1) of a scale it is strengthened serves for combination of the beginnings of scales B and R. PLEASE SEE MY OTHER ITEMS!
The item "USSR Russian Slide Rule Circular KL-1 #4G" is in sale since Tuesday, August 08, 2017. This item is in the category "Collectibles\Science & Medicine (1930-Now)\Engineering\Slide Rules".
The seller is "rebbit2011" and is located in Europe. This item can be shipped worldwide.