Marián Jasko
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Directing the hot flue exhaust through a series of baffles heats up the surrounding masonry. The baffles can meander in numerous directions.

Traditional Russian Fireplace labyrinthine brickwork, one of the earliest forms of masonry stove. They are substantially more efficient than open fires, but with limited air regulation waste a lot of heat up the flue when the fire is out.

Wood joinery with mortise and tenon has been used for thousands of years. Strong and beautiful. This illustration in German called Spannkeilverbindung from Grüne Erde.

Teds Wood Working - Wood joinery with mortise and tenon has been used for thousands of years. Strong and beautiful. This illustration in German called Spannkeilverbindung from Grüne Erde. - Get A Lifetime Of Project Ideas & Inspiration!