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Appendix III

Board Foot Log Rules

Table 1.   Excerpted sections from the International, Doyle, and Scribner Decimal C board foot log rules.   

Scaling diameter
      (inches)


Log length in feet

   
 
 
   

6

8

10

12

14

16

 
 

International 1/4 inch log scale, contents of logs in board feet

 
             

 6

5

10

10

15

15

20

 

 7

10

10

15

20

25

30

 

 8

10

15

20

25

35

40

 

 9

15

20

30

35

45

50

 

10

20

30

35

45

55

65

 

11

25

35

45

55

70

80

 

12

30

45

55

70

85

95

 

13

40

55

70

85

100

115

 

14

45

65

80

100

115

135

 

15

55

75

95

115

135

160

 

16

60

85

110

130

155

180

 

17

70

95

125

150

180

205

 

18

80

110

140

170

200

230

 

19

90

125

155

190

225

260

 

20

100

135

175

210

250

290

 

21

115

155

195

235

280

320

 

22

125

170

215

260

305

355

 

23

140

185

235

285

335

390

 

24

150

205

255

310

370

425

 

25

165

220

280

340

400

460

 

26

180

240

305

370

435

500

 

27

195

260

330

400

470

540

 

28

210

280

355

430

510

585

 

29

225

305

385

465

545

630

 

30

245

325

410

495

585

675

 
               
 

Doyle log scale, contents of logs in board feet

 
               

 6

2

2

3

3

4

4

 

 7

3

5

6

7

8

9

 

 8

6

8

10

12

14

16

 

 9

9

13

16

19

22

25

 

10

14

18

23

27

32

36

 

11

18

25

31

37

43

49

 

12

24

32

40

48

56

64

 

13

30

41

51

61

71

81

 

14

38

50

63

75

88

100

 

15

45

61

76

91

106

121

 

16

54

72

90

108

126

144

 

17

63

85

106

127

148

169

 

18

74

98

123

147

172

196

 

19

84

113

141

169

197

225

 

20

96

128

160

192

224

256

 

21

108

145

181

217

253

289

 

22

122

162

203

243

284

324

 

23

135

181

226

271

316

361

 

24

150

200

250

300

350

400

 

25

165

221

276

331

386

441

 

26

182

242

303

363

424

484

 

27

198

265

331

397

463

529

 

28

216

288

360

432

504

576

 

29

234

313

391

469

547

625

 

30

254

338

423

507

592

676

 
 

Table 1.  Continued

Scaling diameter
      (inches)


Log length in feet

 
 
 
 

6

8

10

12

14

16

 
 

Scribner Decimal C log scale, contents of logs in board feet

 
               

 6

5

5

10

10

10

20

 

 7

5

10

10

20

20

30

 

 8

10

10

20

20

20

30

 

 9

10

20

30

30

30

40

 

10

20

30

30

30

40

60

 

11

20

30

40

40

50

70

 

12

30

40

50

60

70

80

 

13

40

50

60

70

80

100

 

14

40

60

70

90

100

110

 

15

50

70

90

110

120

140

 

16

60

80

100

120

140

160

 

17

70

90

120

140

160

180

 

18

80

110

130

160

190

210

 

19

90

120

150

180

210

240

 

20

110

140

170

210

240

280

 

21

120

150

190

230

270

300

 

22

130

170

210

250

290

330

 

23

140

190

230

280

330

380

 

24

150

210

250

300

350

400

 

25

170

230

290

340

400

460

 

26

190

250

310

370

440

500

 

27

210

270

340

410

480

550

 

28

220

290

360

440

510

580

 

29

230

310

380

460

530

610

 

30

250

330

410

490

570

660

 
 

Source:  Koch (1972).

 
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