Never seen one built like this before! It looks as though it works on the same principles as a Kelly Kettle - except that the hot gases go up the outside of the water container, rather than up through the centre. I wonder if it was intended to run on charcoal, or hexamine? Thank you for posting the pictures, Olgerd! And best regards, Jack
1. 4 tablets of urotropin - 1.5 litr of water to boil . --4 таблетки уротропина -1.5 литра воды закипит . 2. inside asbestos cloth - a heat insulator/ - внутри -асбестовая ткань . 3 boiling time not - время кипения не проверял
uropropin is a hexamethylenetetramine the substance used for neating/burning called solid fuel https://en.wikipedia.org/wiki/Hexamethylenetetramine