Description.

Length in inches.

Side of square in inches.

Deflection in inches.

Corresponding weight in lbs.

Breaking weight in lbs.

Mean breaking weight.

Remarks.

Uniform pillan rounded at the ends that the force might pass throagh the axis.

60.5

1.75

.09

2237

3645

3197

Broke anglewise; it was slightly flattened at the end by the pressure.

.17

3197

This was capped with iron at the ends, to prevent them from being crushed with the pressure. It bent and broke diagonally.

Ditto ditto

60.5

1.75

.13

2141

2749

Uniform pillar, one end rounded and the other flat.

60.5

1.75

.09

2141

...

...

.11

3197

...

...

.13

3645

...

...

.16

4541

...

...

.20

5437

...

...

.27

6333

The rounded end was much crushed.

...

...

.48

7229

7229

6109

Ditto ditto

60.5

1.75

.06

1070

...

...

.08

1598

...

...

.11

2270

...

...

.15

2718

...

...

.17

3166

In this pillar the rounded end was capped with iron to prevent the end being crushed.

...

...

.19

3614

...

...

.23

4093

...

...

.32

4541

4989

* ' Phil. Transactions, 1840.

Description.

Length in inches.

Side of square in inches.

Deflection in inches.

Corresponding weight in lbs.

Break.

ing weight; in lbs.

Mean breaking weight.

Remarks.

Uniform pillar, both ends flat.

60.5

1.75

.02

3355

It was crushed at the end diagonally through the centre and sank down by flexure.

...

..

.04

4795

..

...

.14

9499

10171

Ditto ditto

60.5

1.75

..

..

11179

This sank by landing in the middle as usal; a portion of boil ends was cracked.

Ditto ditto

60.5

1.75

.05

3211

...

...

.09

5467

With 8823 lbs. ii sank down by bending and when unloaded had taken a permanent set of .52 inch.

..

..

11

6139

8323

Ditto ditto

60.5

1.75

.03

1070

This deflection was taken along the side, but it sank down diagonally: one end was slightly crushed.

..

..

direction altered

3390

...

..

.02

4459

...

...

.04

6811

...

...

.07

8155

Most of these pillars changed the direction of flexure as they became loaded.

...

...

.14

8827

8827

Uniform pillars flat at the ends and well hedded.

29.75

1.75

..

..

13083

...

It was crushed at the ends with the pressure, which caused it to break with a less weight than otherwise.

Uniform pillar. flat at the ends and well bedded.

30.25

1.75

..

..

14305

...

With less weight no cracking took place, but with this it wrinkled at the ends, bent, and sank down.

Uniform pillar, flat at the ends and well bedded.

48

1.75

..

...

9229

...

It was slightly bent before the weight was laid on; no cracking at the ends perceived before fracture by bending.

Uniform pillar, flat at the ends.

46.1

1.02

..

..

179l

1754

These generally bent diagonally without crushing at the ends.

Ditto ditto

46.1

1.02

...

...

1791

Ditto ditto

46.1

1.02

..

..

1679

Description.

Length in inches.

Side of square in inches.

Deflection in inches.

Correspond.

ing weight in lbs.

Breaking weight in lbs

Mean breaking weight

Remarks.

Uniform pillar flat at the ends.

46.1

1.50

...

...

8069

7888

In the 1st and 2nd pillars there was no cracking at the ends previous to fracture The last was slightly split at one and by drying, and failed there.

Ditto ditto

46.1

1.50

...

...

8049

Ditto ditto

46.1

1.50

...

...

7545

Note. - In the above Table, by breaking weight is to be understood that which overcame the resistance of the pillar, and with which it sank down.