EVENT Date June (20) 2021
Description Low Air' & LAM clay test
Goal air reduced to match smelt bellows
Team Darrell Markewitz (M)
Neil Peterson
Max
extraction Rey Cogswell
compaction Richard Schwitzer
Isabelle Wigglesworth
FURNACE Type standard short shaft on plinth
Material standard cob / LAM clay + sand
Walls cylinder / clay+sand+horse 7 to 4
Interior 25
Height 60 A
Stack 44
Base 16
Packing charcoal fines 18
Tuyere standard copper
Diameter 2
Angle -25
Proud 5
Air System standard electric blower
Extraction bottom via plinth
MATERIALS Ore DD 1 (red) 51% Fe
Charcoal Oak / 'Cowboy' (hickory?)
Real ELAPSED EVENT AIR CHARCOAL ORE
UNIT COUNT TOTAL Unit TOTAL
pressure LpM bucket kg kg kg
psi 1.8
900 start wood splints pre-heat touch
1000 T 60 start rough charcoal (Cowboy) 500 1 1 1.80
1003 1 2 3.60
1015 to about 8 cm below top 1 3 5.40
1030 1 4 7.20
1035 temperatures BF=1270+ / BR=1270+
UF=1020 / UR=960
1040 gases ignight on top
1050 25 last rough - switch to graded (Cowboy) 1 5 9.00
1112 22 heat to top of coloumn 1 6 11.16
1125 temperatures BF=1275+ / BR=1275
UF=1245 / UR=1190
1132 20 1 7 12.60
1140 first ore addition - Barton's Limonite
1157 25 1 8 14.40 1 L 1 L
1224 27 temperatures BF=melted / BR=1270+ 1 9 16.20 1 L 2 L
UF=1150 / UR=1150
1244 20 switched to analog 1 10 18.00 1 O 1 O
1304 20 1 11 19.80 1 2
1330 26 1 12 21.60 1 3
1354 24 increase ore 1 13 23.40 1.5 4.5
1416 22 1 14 25.20 1.5 6
1431 15 slag tap 1 15 27.00 1.5 7.5
1502 31 increase ore 1 16 28.80 2 9.5
1526 24 slag tap 1 17 30.60 2 11.5
28 E missed record / oak / ore increase 1 18 32.40 2 13.5
1621 28 E 1 19 34.20 3 16.5
1643 22 slag tap 1 20 36.00 3 19.5
1710 27 1 21 37.80 3 22.5
1735 25 balance ore 1 22 39.60 2 24.5
1805 30 final charcoal to cover 1 23 41.40
start burn down
TOTALS
Charcoal 41.4 kg
Ore 24.5 kg
poor limonite added 2.0 kg
Bloom 7.0 kg
Gromps
Yield 28.6 %
Condition entire bowl extracted - top eroded 
Quality very spongy