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Bellows Double

I have assembled a set of double bellows that I can use at multiple time period re-enactments what I learned is that BIG valves are essential. 7+ inches across. 
The 1 inch pipe was a bit on the small side. I'll use a bigger pipe next time. 


Documentation:

Based on this woodcut dating from 1580 I have a good idea of the stand style I will be using.

Zusammengesetzter Blasebalg:  Crosscut of double bellows  of unknown timeperiod


Civil War Bellows
There were some excellent images shared on facebook from the author of Civil War Blacksmithing
https://www.facebook.com/pages/Civil-War-Blacksmithing

NCABANA article on Bellows contruction
http://www.ibiblio.org/nc-abana/newsletter/2012q1_ncabana.pdf

Description:
Essentially you end up with a series of layers


TOP BOARD
TOP RIB
CENTER BOARD
BOTTOM RIB
BOTTOM BOARD

Materials
Sunforger canvas
8 door hinges
lots of screws
1 lb 3/4 inch tacks from mcmaster carr
2 sheets 3/4 inch plywood
1 piece of 1 inch pipe
ratchet strap webbing

Steps
I cut 5 identical pieces of plywood the same size as the centerboard.

4 ft long
30 14 inch wide
with 6inches wide at the head stock







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