Showing the Weight or Pressure a beam of Cast Iron, 1 inch in breadth, will sustain, without destroying its elastic force, when it is supported at each end, and loaded in the middle of its length, and also the deflection in the middle which that weight will produce. By Mr. Hodg-kinson, Manchester.

Length.

6 Feet.

7 Feet.

8 Feet.

9 Feet.

10 Feet.

Depth in in.

Weight

Defl.

Weight in lbs.

Defl.

in in.

Weight

Defl.

Weight in lbs.

Defl.

in in.

Weight in lbs.

Defl.

in in.

3

1278

•24

1089

•33

954

426

855

•54

765

•66

3½

1739

•205

1482

•28

1298

•365

1164

•46

1041

•67

4

2272

•18

1936

•245

1700

•32

1520

.405

1360

•5

4½

2875

•16

2450

•217

2146

•284

1924

.36

1721

•443

6

3560

•144

3050

•196

2650

•256

2375

•32

2125

•4

6

5112

•12

4356

•163

3816

.213

3420

•27

3060

•33

7

6958

•103

5929

•14

5194

•183

4655

•23

4165

•29

8

9088

•09

7744

•123

6784

•16

6080

•203

5440

•25

9

9801

•109

8586

•142

7695

•18

6885

22

10

12100

•098

10600

•128

9500

162

8500

•2

11

12826

•117

11495

15

10285

•182

12

15264

•107

13680

•135

12240

•17

13

16100

•125

14400

•154

14

18600

•115

16700

143

12 Feet.

14 Feet.

16 Feet.

18 Feet.

20 Feet.

6

2548

•48

2184

•65

1912

•85

1699

1.08

1530

1.34

7

3471

•41

2975

•58

2603

•73

2314

•93

2082

1 14

8

4532

•36

3884

•49

3396

•64

3020

•81

2720

100

9

5733

•32

4914

•44

4302

•57

8826

•72

3438

•89

10

7083

•28

6071

•39

5312

•51

4722

•64

4250

•8

11

8570

•26

7346

•36

6428

•47

6714

•69

5142

•73

12

10192

24

8736

•33

7648

•43

6796

.54

6120

.67

13

11971

•22

10260

•31

8978

•39

7980

•49

7182

•61

14

13883

•21

11900

•28

10412

•36

9265

•46

8330

•67

15

15937

•19

13660

•26

11952

•34

10624

•43

9663

•53

16

18128

•18

15536

•24

13584

•32

12080

•40

10880

•5

17

20500

•17

17500

•23

15353

•30

13647

•38

12282

•47

18

22932

•16

19656

•21

17208

•28

16700

•36

13752

•44

Note

This table shows the greatest weight that ever ought to be laid upon a beam for permanent load; and if there be any liability to jerks, etc., ample allowance must be made; also, the weight of the beam itself must be included. [See Tablet of Cast Iron. ]