CLOCK ELAPSED EVENT AIR CHARCOAL ORE
Pruszkow 1 - Sep 9, 2016 UNIT COUNT TOTAL min/kg Unit TOTAL
bucket kg kg kg
2 ?
E 0900 start wood splint - dry to pre-heat
1025 added fines  to set base
1030 seal arches, start gentle air
1:30 start to fill with rough charcoal 65% 2 2 4
1037 added first graded bucket
1043 6 (tamp down gaps ?) 1 3 6 3
1057 14 1 4 8 7
1112 15 1 5 10 8
1115 sealed gaps along air system
1125 13 1 6 12 7
1135 10 start ore as 4 @ 250 gm 1 7 14 5
1147 12 1 8 16 6 1 1
1200 13 1 9 18 7 1 2
1211 11 fracture at top edge of furnace 1 10 20 6 1 3
temp = 1040/1334
1223 12 ore as 4 @ 500 gm 1 11 22 6 2 5
temp = (3rd) 1260/1110/1020
1234 11 1 12 24 6 2 7
1245 11 1 13 26 6 2 9
1257 12 1 14 28 6 2 11
1308 11 ore as 3 @ 1000 gm 1 15 30 6 3 14
1322 14 1 16 32 7 3 17
1334 12 ore as 4 @ 500 gm 1 17 34 6 2 19
1344 10 1 18 36 5 2 21
1354 10 ore as 3 @ 1000 gm / bubble sound 1 19 38 5 3 24
1356 tap arch openned
1401 raked out lower base fines
1407 13 1 20 40 7 3 27
1419 12 1 21 42 6 3 30
1430 11 cover charcoal 1 22 44 6
added second cover charcoal 1 23 46
start burn down
1500 reduced air / furnace to about 1/2
(no record of extraction time)
TOTALS (kg)
Charcoal 46
Consumption (average min/kg) 6
Ore - 50/50 Harres / Goldager 30
Bloom 5.8
Yield (%) 19.3