S P E

439

SPH

Table of Specific Gravities of Bodies.

cast, not ham-

mered

C 0t) ’ ° ast , common ...G 0 j? er ' not hammeredi ’ Pure, melted, not

m mme red. :

1 the same ham-

m er ed

SijJi' 04 . . .

n-’^'ther tempered

^hardened.....

. ’hardened, but not

.

Le ar > re ’ Prismatic

tnolten..

5 0re of, cubic

METALS.

tv m °nd ..

Cn ald ••

»«?".

>hi;;--

of the

P«Z:z:

Oo * from

jSsi'"’ 1 ' 1 ’

I

tone

Giant’s

alk

.. “

f*' 1 .

C h '»«, m

mm

a “ r l *’ gre en

on.

commercial...

phed ’ ‘'ghly recti-

‘ter

1 Vr ee t- .

.!

> Covv’j

Mercury, solid or con-

8396

gealed .

15632

7824

7788

13568

Nickel, molten.

7807

Platina, crude, in grains

15602

19258

-, purified, not

19362

hammered.

-, ditto, ham-

19500

17629

mered .

20337

7207

Silver, virgin, not

7700

hammered.

10477

-, ditto, hammered 10511

7833

-, shilling .

Tin , pure Cornish,

10534

7840

melted, and not bar-

7355

dened .

7291

11352

-, hardened.

7299

7587

Zinc, molten.

7191

STONES.

3549

Spar .

2595

Topaz .

4011

2782

Agate onyx. .

2638

2653

Flint.

2594

3521

Jasper .

2816

2775

Opal.

2114

4189

Pearl.

2684

4283

Pebble .

2664

3994

Stone, paving .

2416

3 STONES, EAETHS, &C.

2730

Glass, white .

2892

1078

-, bottle .

2733

926

Granite, red Egyptian

2654

Hone, white razor ...

2876

2864

Limestone ..

3179

1975

Marble .

2742

2000

Phosphorus .

1714

2784

Portland stone .

2013

2000

Porphyry .

2765

1269

Pyrites .

4954

1520

Slate .

2672

2168

Stone, common.

2520

2642

Sulphnr.

2033

QUORS, OILS , &C.

837

Oil of turpentine .

870

-, whale .

923

829

Water, rain .

1000

720

-, distilled.

1000

1034

1020

1032

1026

Wine, Port .

997

.

^tvder '

EE SINS, GUMS, &C.965 Honey .

1659

989

930

. 1456

Ivory... 1822

Tallow . 945

Wax ,

897

%

‘«r

WOODS.

". 800 I Beech . 852

rtink of.. 845 I Box, French . 912

Cedar .

Cherry-tree .

Cork.

Ebony .

Elder-tree.

Elm, trunk of ...Fir, red or yellow

Fir , white.

Larch .

Lignum-vitse.

Logwood .

Atmospheric airCarbonic acid ..Carbonic oxide..Hydrogen .

596

715

240

1331

695

671

550

470

560

1333

913

Mahogany.

Maple .

Oak, heart of, 60 yearsPine, American yellow

Poplar .

Vine.

Walnut.

Willow.

Yew, Dutch .

-, Spanish .

1063

750

1170

460

383

1327

671

585

788

807

GASSES.

1.000

1.524

967

69

Light gasNitrogen .Oxygen .Pit gas ...

986

972

1.106

558

SPERE, a screen across the lower end of ancient halls.

SPHERE, (from the Greek, atpaipa, a ball,) a solid, whosesurface is everywhere equally distant from a certain pointwithin the solid ; which point is called the centre of thesphere.

Every sphere is equal to two-thirds of its circumscribingcylinder; that is, it is equal to a cylinder, whose ends are cir-cles, equal to a great circle of the sphere, and whose heightis equal to the diameter of the same. Therefore,

To find the solidity of a sphere. Multiply the square ofthe diameter by .7854, and this product by the diameter,of the sphere, and take two-thirds of the last product; or,—Multiply the cube of the diameter by .5236, and the productis the solid content.

To find the superficies of a sphere. —Multiply the area ofthe great circle by .4, and the product is the superficies.

Example .— To find the solidity of a sphere, whose diameteris 23 feet, 3 inches.

Here 23 : 3 = 23.25 in decimals.

23.25

23.25

11625

4650

6975

4650

540.5625

23.25

27028125

10811250

16216875

10811250

12568.078125

.5236

75408468750

37704234375

25136156250

62840390625

6580.6457062500

The superficial content of the same sphere is 540 5625X 4 = 2162.2500.

SPHERICAL BRACKETING, the forming of bracketsto support lath-and-plaster-work, so that the surface of