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Length of Propor- | Breaking Length of Propor- Breaking Length of Propor. Breaking each Piece tion of Weight in each Piece tion of Weight in each Piece tion of Weight in in English Depth to Ibs.avoir. in English Depth to lbs.avoir- in English Depth to lbs. avoirFeet. Length. dupois.

Feet.

Length. dupois. Feet. Length. dupois.

[blocks in formation]

9.594 in. by 11.726 in.

10:66 in. by 11•726 in. 9.771

10 78848
11.73
12 64780

9.771 10 87520 13.68 14 54800

11.73 12 71978 15.63 16 47305

13.67 14 60889 17:59 18

41476
15.63

52548
19:59
20 36820
17:59

45985 21:50

33004

19.54 20 40911 23:45 24 29825

21.50

36671 25:40 26 27138 23:45

33198 27.36 28 24830

25.40

301 55
29:21
30

28
22832
27.36

27491 29-21

30

25369 9.594 in. by 12.792 in.

22 24 26

| 8.528 in. by 13.858 in.

10.66 in. by 12.792 in. 10.66 10

85929 12:79 12 70670 10.66 10 95476 14.92 59782 12.79

12 78521 17.06 16 51406 14.92 14 66124 19:19 18 45247 17 OG 16 57340

11.55 13.96 16.17 18.48 20:79

10 12 14 16 18

82746 68052 57576 49627 43628

Length of Propor- | Breaking || Length of | Propor- Breaking Length of Proporeach Piece tion of Weight in each Piece tion of Weight in each Piece tion of in English Depth to Ibs. avoir- in English Depth to lbs.avoir in English Depth to Feet. Length. dupols. Feet. Length. dupois.

Feet. Length.

Breaking Weight in lbs.avoir dupois.

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Length of Propor. Breaking Length of Propor: Breaking Length of Propor- | Breaking cach Piece tion of Weight in each Piece tion of Weight in each Piece tion of Weight in in English Depth to lbs. avoir- in English Depth to lbs.avoir. in English Depth to lbs. avoir Feet. Length. dupois. Feet. Length. dupois.

Feet. Length. dupois.

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16.88 20.25 23.63 27.00 29.38

10
12
14
16

196522
161624
136724
118026
103481

15.99 19:19 22:37 25.58 28.78

10 12 14 16 18

200501
164895
139492
120415
105575

15:10 18.12 21:14 24:16 27:18

14 16 18

202888
166859
141153
121848
106832

Length of Propor: Breaking Length of Propor: Breaking Length of Propor- Breaking each Piece tion of Weight in each Piece tion of Weight in each Piece tion of Weight in in English Depth to lbs.avoir- in English Depth to lbs.avoir- l in English Depth to lbs.avoir

Feet. Length. dupois. Feet. Length. dupois. Feot. Length. dupois.

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Length of Proporeach

Piece tion of in English Depth to

Feet, Length.

Breaking Length of Propor | Breaking Length of Propor- | Breaking
Weight in each Piece tion of

Weight in each Piece tion of Weight in lbs.avoir- in English Depth to Ibs.avoir. in English Depth to lbs.avoirdupois. Feet. Length. dupois. Feet. Length. dupois.

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1623. The table from which the above has been reduced to English measures, is extended to pieces of 31.980 in. square, and 47:97 ft. long; but as such scantlings rarely if ever occur in practice, unless strengthened by means of trussing, we have not considered it necessary to proceed beyond the scantling of 20-25 in. by 21.320 in., and 32 ft. long.

1624. Though the table is founded upon experiments on oak, it will serve for all sorts of wood, whose primitive strength is known, and the proportion they bear to oak. In order to facilitate calculations of that nature, the following table has been constructed, in which will be found the absolute and primitive strengths of the several sorts of timber, ordinarily used in carpentry, as also of some few others.

TABLE VII. For applying the preceding Table to the Woods undermentioned. The primitive hori

zontal or transverse Strength of Oak is taken at 1000; its supporting or primitive vertical Strength at 807 ; and its cohesive or absolute Strength at 1821 ; being deduced from Pieces 19.188 lines English square.

Species of Wood.

Primitive Primitive | Absolute
horizontal vertical cohesive
Strength. Strength. Strength.

Species of
Wood.

Primitive horizontal Strength.

Primitive Absolute vertical cohesivo Strength. Strength.

2

Acacia (yellow)
Ash
Beech
Birch
Cedar
Cherry tree
Chestnut
Elm

780
1072
1032
853
627
961
957
1077

1228
1112
986
861
720
986
950
1075

1560
1800
2480
1980
1740
1912
1944
1980

Fir
Oak
Pine-tree
Poplar
Service-tree
Sycamore -
Yew-tree
Walnut

918
1000
882
586
965
900
1037
900

851
807
804
680
981
968
1375
753

1250
1821
1141

940
1642
1564
2287
1120

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