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Like the Scribner rule, the Spaulding Log Rule is Diagram Based Rule
From the Redwood Forest Handbook, Reveal, J and Wallen, A (1948):
"The Spaulding rule is the statute log rule of California. It was constructed by N. W. Spaulding in 1878 from diagrams of logs measuring 10 to 96 inches in diameter . An 11 /32 - inch saw - kerf and 1 -inch lumber was assumed. The size of the slab was varied according to the size of the log. This error of construction gives an over-run for large logs. The table is prepared for logs from 12 to 24 feet long. Longer logs are scaled by doubling the value in the table. By doing this, taper in logs is again ignored. This feature is the most serious defect in the rule. There is considerable over -run when the modern band saw is used, because of the large saw-kerf used in the rule."
"The Spaulding rule is used throughout the redwood region either in its original form or as the Humboldt Log Rule."
"The Humboldt log rule is the Spaulding scale less 30 percent. This rule was developed for use with old growth redwood to take care of the large amount of invisible defect. It is difficult to “scale out” defect in redwood logs so a blanket 30 percent deduction is made. In some areas where the amount of defect is small, a large over-run is secured. The Humboldt log'rule has been used at times to scale Douglas fir. This practice is not recommended as it is entirely practical to scale out defect in fir logs."
Here is the Spaulding table:
Diam/Len | 12' | 13' | 14' | 15' | 16' | 17' | 18' | 19' | 20' | 21' | 22' | 23' | 24' |
10" | 38 | 41 | 44 | 47 | 50 | 53 | 57 | 60 | 63 | 66 | 69 | 72 | 76 |
11" | 47 | 51 | 55 | 59 | 63 | 67 | 70 | 74 | 78 | 82 | 86 | 90 | 94 |
12" | 58 | 62 | 67 | 72 | 77 | 82 | 87 | 91 | 96 | 101 | 106 | 111 | 116 |
13" | 71 | 76 | 82 | 88 | 94 | 100 | 106 | 112 | 118 | 124 | 130 | 136 | 142 |
14" | 86 | 93 | 100 | 107 | 114 | 121 | 129 | 136 | 143 | 150 | 157 | 164 | 172 |
15" | 103 | 111 | 120 | 128 | 137 | 145 | 154 | 163 | 171 | 180 | 188 | 197 | 206 |
16" | 121 | 131 | 141 | 151 | 161 | 171 | 181 | 191 | 201 | 211 | 221 | 231 | 242 |
17" | 141 | 152 | 164 | 176 | 188 | 199 | 211 | 223 | 235 | 246 | 258 | 270 | 282 |
18" | 162 | 175 | 189 | 202 | 216 | 229 | 243 | 255 | 270 | 283 | 297 | 310 | 324 |
19" | 184 | 199 | 214 | 230 | 245 | 260 | 276 | 291 | 306 | 322 | 337 | 352 | 368 |
20" | 207 | 224 | 241 | 258 | 276 | 293 | 310 | 327 | 345 | 362 | 379 | 396 | 414 |
21" | 231 | 250 | 269 | 288 | 308 | 327 | 346 | 365 | 385 | 404 | 423 | 442 | 462 |
22" | 256 | 277 | 298 | 320 | 341 | 362 | 384 | 405 | 426 | 448 | 469 | 490 | 512 |
23" | 282 | 305 | 329 | 352 | 376 | 399 | 423 | 445 | 470 | 493 | 517 | 540 | 564 |
24" | 309 | 334 | 360 | 387 | 412 | 437 | 463 | 489 | 515 | 540 | 566 | 592 | 618 |
25" | 337 | 365 | 393 | 421 | 449 | 477 | 505 | 533 | 561 | 589 | 617 | 645 | 674 |
26" | 366 | 396 | 427 | 457 | 488 | 518 | 549 | 579 | 610 | 640 | 671 | 701 | 732 |
27" | 396 | 429 | 462 | 495 | 528 | 561 | 594 | 627 | 660 | 693 | 726 | 759 | 792 |
28" | 427 | 462 | 498 | 533 | 569 | 604 | 640 | 676 | 711 | 747 | 782 | 818 | 854 |
29" | 459 | 497 | 535 | 573 | 612 | 650 | 688 | 726 | 765 | 803 | 841 | 879 | 918 |
30" | 492 | 533 | 574 | 615 | 656 | 697 | 738 | 779 | 820 | 861 | 902 | 943 | 984 |
31" | 526 | 569 | 613 | 657 | 701 | 745 | 789 | 832 | 876 | 920 | 964 | 1008 | 1052 |
32" | 561 | 607 | 654 | 701 | 748 | 794 | 841 | 888 | 935 | 981 | 1028 | 1075 | 1122 |
33" | 597 | 646 | 696 | 745 | 796 | 845 | 895 | 945 | 995 | 1044 | 1094 | 1144 | 1194 |
34" | 634 | 686 | 739 | 792 | 845 | 898 | 951 | 1003 | 1056 | 1109 | 1162 | 1215 | 1268 |
35" | 673 | 729 | 785 | 841 | 897 | 953 | 1009 | 1065 | 1121 | 1177 | 1233 | 1289 | 1346 |
36" | 713 | 772 | 831 | 891 | 950 | 1010 | 1069 | 1128 | 1188 | 1247 | 1307 | 1366 | 1426 |
37" | 755 | 817 | 880 | 943 | 1006 | 1069 | 1132 | 1195 | 1258 | 1321 | 1384 | 1447 | 1510 |
38" | 798 | 864 | 931 | 997 | 1064 | 1130 | 1197 | 1263 | 1330 | 1397 | 1463 | 1529 | 1596 |
39" | 843 | 913 | 983 | 1053 | 1124 | 1194 | 1264 | 1334 | 1405 | 1475 | 1545 | 1615 | 1686 |
40" | 889 | 963 | 1037 | 1111 | 1185 | 1259 | 1333 | 1407 | 1481 | 1555 | 1629 | 1703 | 1778 |
41" | 936 | 1014 | 1092 | 1170 | 1248 | 1326 | 1404 | 1482 | 1560 | 1638 | 1716 | 1794 | 1872 |
42" | 984 | 1066 | 1148 | 1230 | 1312 | 1394 | 1476 | 1558 | 1640 | 1722 | 1804 | 1886 | 1968 |
43" | 1033 | 1119 | 1205 | 1291 | 1377 | 1463 | 1549 | 1635 | 1721 | 1807 | 1893 | 1979 | 2066 |
44" | 1086 | 1176 | 1267 | 1357 | 1448 | 1538 | 1629 | 1719 | 1810 | 1900 | 1991 | 2081 | 2172 |
45" | 1134 | 1228 | 1323 | 1417 | 1512 | 1606 | 1701 | 1795 | 1890 | 1984 | 2079 | 2173 | 2268 |
46" | 1186 | 1284 | 1383 | 1482 | 1581 | 1680 | 1779 | 1877 | 1976 | 2075 | 2174 | 2273 | 2372 |
47" | 1239 | 1342 | 1445 | 1548 | 1652 | 1755 | 1858 | 1961 | 2065 | 2168 | 2271 | 2374 | 2478 |
48" | 1293 | 1400 | 1508 | 1616 | 1724 | 1831 | 1939 | 2047 | 2155 | 2262 | 2370 | 2478 | 2586 |
49" | 1348 | 1460 | 1572 | 1685 | 1797 | 1909 | 2022 | 2134 | 2246 | 2359 | 2470 | 2582 | 2696 |
50" | 1404 | 1521 | 1638 | 1755 | 1872 | 1989 | 2106 | 2223 | 2340 | 2457 | 2574 | 2691 | 2808 |
51" | 1461 | 1582 | 1704 | 1826 | 1948 | 2069 | 2191 | 2313 | 2435 | 2556 | 2678 | 2800 | 2922 |
52" | 1519 | 1645 | 1772 | 1898 | 2025 | 2151 | 2278 | 2405 | 2531 | 2657 | 2784 | 2911 | 3038 |
53" | 1578 | 1709 | 1841 | 1972 | 2104 | 2235 | 2367 | 2498 | 2630 | 2761 | 2893 | 3024 | 3156 |
54" | 1638 | 1774 | 1911 | 2047 | 2184 | 2320 | 2457 | 2593 | 2730 | 2866 | 3003 | 3139 | 3276 |
55" | 1700 | 1841 | 1983 | 2125 | 2266 | 2408 | 2550 | 2691 | 2833 | 2974 | 3116 | 3258 | 3400 |
56" | 1763 | 1909 | 2056 | 2203 | 2350 | 2497 | 2644 | 2791 | 2938 | 3085 | 3232 | 3379 | 3526 |
57" | 1827 | 1979 | 2131 | 2283 | 2436 | 2588 | 2740 | 2892 | 3045 | 3197 | 3349 | 3501 | 3654 |
58" | 1893 | 2050 | 2208 | 2366 | 2524 | 2681 | 2839 | 2997 | 3155 | 3312 | 3470 | 3628 | 3786 |
59" | 1960 | 2123 | 2286 | 2450 | 2613 | 2776 | 2940 | 3103 | 3266 | 3429 | 3592 | 3756 | 3920 |
60" | 2028 | 2197 | 2366 | 2535 | 2704 | 2873 | 3042 | 3211 | 3380 | 3549 | 3718 | 3887 | 4056 |
61" | 2098 | 2272 | 2447 | 2622 | 2797 | 2972 | 3147 | 3321 | 3496 | 3671 | 3846 | 4021 | 4196 |
62" | 2169 | 2349 | 2530 | 2711 | 2892 | 3072 | 3253 | 3434 | 3615 | 3795 | 3976 | 4157 | 4338 |
63" | 2241 | 2427 | 2614 | 2801 | 2988 | 3174 | 3361 | 3548 | 3735 | 3921 | 4108 | 4295 | 4482 |
64" | 2315 | 2507 | 2700 | 2893 | 3086 | 3279 | 3472 | 3665 | 3858 | 4051 | 4244 | 4437 | 4630 |
65" | 2390 | 2589 | 2789 | 2987 | 3186 | 3385 | 3585 | 3784 | 3983 | 4182 | 4381 | 4580 | 4780 |
66" | 2467 | 2672 | 2878 | 3083 | 3289 | 3494 | 3700 | 3906 | 4111 | 4316 | 4522 | 4728 | 4934 |
67" | 2545 | 2757 | 2969 | 3181 | 3393 | 3605 | 3817 | 4029 | 4241 | 4453 | 4665 | 4877 | 5090 |
68" | 2625 | 2843 | 3062 | 3281 | 3500 | 3718 | 3937 | 4156 | 4375 | 4593 | 4812 | 5031 | 5250 |
69" | 2706 | 2931 | 3157 | 3382 | 3608 | 3833 | 4059 | 4284 | 4510 | 4735 | 4961 | 5185 | 5412 |
70" | 2789 | 3021 | 3253 | 3486 | 3718 | 3951 | 4183 | 4415 | 4648 | 4880 | 5113 | 5345 | 5578 |
71" | 2874 | 3113 | 3353 | 3592 | 3832 | 4071 | 4311 | 4550 | 4790 | 5029 | 5269 | 5508 | 5748 |
72" | 2960 | 3206 | 3453 | 3700 | 3946 | 4193 | 4440 | 4686 | 4933 | 5180 | 5426 | 5673 | 5920 |
73" | 3047 | 3301 | 3555 | 3809 | 4062 | 4316 | 4570 | 4824 | 5078 | 5332 | 5586 | 5840 | 6094 |
74" | 3135 | 3396 | 3657 | 3919 | 4180 | 4441 | 4702 | 4964 | 5225 | 5486 | 5748 | 6009 | 6270 |
75" | 3224 | 3492 | 3761 | 4030 | 4298 | 4567 | 4836 | 5104 | 5372 | 5640 | 5909 | 6178 | 6446 |
76" | 3314 | 3590 | 3866 | 4142 | 4418 | 4694 | 4970 | 5246 | 5522 | 5798 | 6074 | 6350 | 6626 |
77" | 3405 | 3688 | 3972 | 4256 | 4540 | 4823 | 5107 | 5391 | 5675 | 5959 | 6242 | 6526 | 6810 |
78" | 3497 | 3788 | 4080 | 4371 | 4663 | 4954 | 5245 | 5537 | 5829 | 6120 | 6412 | 6704 | 6995 |
79" | 3590 | 3889 | 4188 | 4487 | 4786 | 5085 | 5385 | 5684 | 5983 | 6282 | 6581 | 6880 | 7180 |
80" | 3684 | 3991 | 4298 | 4605 | 4912 | 5219 | 5526 | 5833 | 6140 | 6447 | 6754 | 7061 | 7368 |
81" | 3779 | 4094 | 4408 | 4723 | 5038 | 5353 | 5668 | 5983 | 6298 | 6613 | 6928 | 7243 | 7558 |
82" | 3874 | 4190 | 4519 | 4842 | 5165 | 5488 | 5811 | 6133 | 6456 | 6779 | 7102 | 7424 | 7747 |
83" | 3970 | 4301 | 4631 | 4962 | 5293 | 5624 | 5955 | 6285 | 6616 | 6947 | 7278 | 7608 | 7939 |
84" | 4067 | 4406 | 4745 | 5084 | 5423 | 5762 | 6101 | 6440 | 6778 | 7117 | 7456 | 7795 | 8134 |
85" | 4165 | 4512 | 4859 | 5206 | 5553 | 5900 | 6247 | 6594 | 6941 | 7288 | 7635 | 7982 | 8329 |
96" | 4264 | 4619 | 4974 | 5330 | 5685 | 6040 | 6396 | 6751 | 7106 | 7461 | 7816 | 8172 | 8527 |
87" | 4364 | 4727 | 5091 | 5455 | 5818 | 6182 | 6546 | 6909 | 7273 | 7637 | 8000 | 8364 | 8728 |
88" | 4465 | 4837 | 5209 | 5581 | 5953 | 6325 | 6697 | 7069 | 7441 | 7813 | 8185 | 8557 | 8929 |
89" | 4566 | 4946 | 5327 | 5707 | 6088 | 6468 | 6849 | 7229 | 7610 | 7990 | 8371 | 8752 | 9132 |
90" | 4668 | 5057 | 5446 | 5835 | 6224 | 6613 | 7002 | 7391 | 7780 | 8169 | 8558 | 8947 | 9336 |
91" | 4771 | 5168 | 5566 | 5964 | 6361 | 6759 | 7156 | 7554 | 7951 | 8348 | 8746 | 9144 | 9541 |
92" | 4875 | 5281 | 5687 | 6094 | 6500 | 6906 | 7312 | 7719 | 8125 | 8531 | 8938 | 9344 | 9750 |
93" | 4980 | 5395 | 5810 | 6225 | 6640 | 7055 | 7470 | 7885 | 8300 | 8715 | 9130 | 9545 | 9960 |
94" | 5085 | 5508 | 5932 | 6356 | 6780 | 7203 | 7627 | 8051 | 8475 | 8899 | 9322 | 9746 | 10170 |
95" | 5192 | 5624 | 6057 | 6490 | 6922 | 7355 | 7788 | 8220 | 8653 | 9086 | 9518 | 9951 | 10384 |
96" | 5300 | 5741 | 6183 | 6625 | 7066 | 7505 | 7950 | 8391 | 8833 | 9275 | 9716 | 10158 | 10600 |
97" | 5391 | 5840 | 6289 | 6738 | 7187 | 7636 | 8085 | 8534 | 8983 | 9432 | 9881 | 10330 | 10779 |
98" | 5502 | 5960 | 6418 | 6876 | 7334 | 7792 | 8250 | 8708 | 9166 | 9624 | 10082 | 10540 | 10998 |
99" | 5614 | 6081 | 6548 | 7015 | 7482 | 7949 | 8416 | 8883 | 9350 | 9817 | 10284 | 10751 | 11218 |
100" | 5727 | 6204 | 6681 | 7158 | 7635 | 8112 | 8589 | 9066 | 9543 | 10020 | 10497 | 10974 | 11451 |
101" | 5840 | 6326 | 6812 | 7298 | 7784 | 8270 | 8756 | 9242 | 9728 | 10214 | 10700 | 11186 | 11672 |
102" | 5957 | 6453 | 6949 | 7445 | 7941 | 8437 | 8933 | 9429 | 9925 | 10421 | 10917 | 11413 | 11909 |
103" | 6067 | 6572 | 7077 | 7582 | 8087 | 8592 | 9097 | 9602 | 10107 | 10612 | 11117 | 11622 | 12127 |
104" | 6190 | 6705 | 7220 | 7735 | 8250 | 8765 | 9280 | 9795 | 10310 | 10825 | 11340 | 11855 | 12370 |
105" | 6309 | 6834 | 7359 | 7884 | 8409 | 8934 | 9459 | 9984 | 10509 | 11034 | 11559 | 12084 | 12609 |
106" | 6467 | 7005 | 7543 | 8081 | 8619 | 9157 | 9695 | 10233 | 10771 | 11309 | 11847 | 12385 | 12923 |
107" | 6549 | 7094 | 7639 | 8184 | 8729 | 9274 | 9819 | 10364 | 10909 | 11454 | 11999 | 12544 | 13089 |
108" | 6669 | 7224 | 7779 | 8334 | 8889 | 9444 | 9999 | 10554 | 11109 | 11664 | 12219 | 12774 | 13329 |
109" | 6782 | 7355 | 7928 | 8501 | 9074 | 9647 | 10220 | 10793 | 11366 | 11939 | 12512 | 13085 | 13658 |
110" | 6909 | 7484 | 8059 | 8634 | 9209 | 9784 | 10359 | 10934 | 11509 | 12084 | 12659 | 13234 | 13809 |
111" | 7035 | 7622 | 8209 | 8796 | 9385 | 9970 | 10557 | 11144 | 11731 | 12318 | 12905 | 13492 | 14079 |
112" | 7133 | 7727 | 8321 | 8915 | 9509 | 10103 | 10697 | 11291 | 11885 | 12479 | 13073 | 13667 | 14261 |
113" | 7273 | 7879 | 8485 | 9091 | 9697 | 10303 | 10909 | 11515 | 12121 | 12727 | 13333 | 13939 | 14545 |
114" | 7400 | 8016 | 8632 | 9248 | 9864 | 10480 | 11096 | 11712 | 12328 | 12944 | 13560 | 14176 | 14792 |
115" | 7532 | 8159 | 8786 | 9413 | 10040 | 10667 | 11294 | 11921 | 12548 | 13175 | 13802 | 14429 | 15056 |
116" | 7661 | 8299 | 8937 | 9575 | 10213 | 10851 | 11489 | 12127 | 12765 | 13403 | 14041 | 14679 | 15317 |
117" | 7792 | 8441 | 9090 | 9739 | 10388 | 11037 | 11686 | 12335 | 12984 | 13633 | 14282 | 14931 | 15580 |
118" | 7922 | 8582 | 9242 | 9902 | 10562 | 11222 | 11882 | 12542 | 13202 | 13862 | 14522 | 15182 | 15842 |
119" | 8058 | 8729 | 9400 | 10071 | 10742 | 11413 | 12084 | 12755 | 13426 | 14097 | 14768 | 15439 | 16110 |
120" | 8204 | 8887 | 9570 | 10253 | 10936 | 11619 | 12302 | 12985 | 13668 | 14351 | 15034 | 15717 | 16400 |
121" | 8338 | 9032 | 9726 | 10420 | 11114 | 11808 | 12502 | 13196 | 13890 | 14584 | 15278 | 15972 | 16666 |
122" | 8432 | 9134 | 9836 | 10538 | 11240 | 11942 | 12644 | 13346 | 14048 | 14750 | 15452 | 16154 | 16856 |
123" | 8614 | 9331 | 10048 | 10765 | 11482 | 12199 | 12916 | 13633 | 14350 | 15067 | 15784 | 16501 | 17218 |
124" | 8801 | 9534 | 10267 | 11000 | 11733 | 12466 | 13199 | 13932 | 14665 | 15398 | 16131 | 16864 | 17597 |
125" | 8888 | 9628 | 10368 | 11108 | 11848 | 12588 | 13328 | 14068 | 14808 | 15548 | 16288 | 17028 | 17768 |
126" | 9034 | 9786 | 10538 | 11290 | 12042 | 12794 | 13546 | 14298 | 15050 | 15802 | 16554 | 17306 | 18058 |
127" | 9172 | 9936 | 10700 | 11464 | 12228 | 12992 | 13756 | 14520 | 15284 | 16048 | 16812 | 17576 | 18340 |
128" | 9320 | 10096 | 10872 | 11648 | 12424 | 13200 | 13976 | 14752 | 15528 | 16304 | 17080 | 17856 | 18632 |
129" | 9465 | 10253 | 11041 | 11829 | 12617 | 13405 | 14193 | 14981 | 15769 | 16557 | 17345 | 18133 | 18921 |
130" | 9615 | 10416 | 11217 | 12018 | 12819 | 13620 | 14421 | 15221 | 16022 | 16823 | 17624 | 18425 | 19226 |
131" | 9761 | 10574 | 11387 | 12200 | 13013 | 13826 | 14639 | 15452 | 16265 | 17078 | 17891 | 18704 | 19517 |
132" | 9904 | 10729 | 11554 | 12379 | 13204 | 14029 | 14854 | 15679 | 16504 | 17329 | 18154 | 18979 | 19804 |
133" | 10059 | 10897 | 11735 | 12573 | 13411 | 14249 | 15087 | 15925 | 16763 | 17601 | 18439 | 19277 | 20115 |
134" | 10207 | 11057 | 11907 | 12757 | 13607 | 14457 | 15307 | 16157 | 17007 | 17857 | 18707 | 19557 | 20407 |
135" | 10361 | 11232 | 12103 | 12974 | 13845 | 14716 | 15587 | 16458 | 17329 | 18200 | 19071 | 19942 | 20813 |
136" | 10504 | 11379 | 12254 | 13129 | 14004 | 14879 | 15754 | 16629 | 17504 | 18379 | 19254 | 20129 | 21004 |
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