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