7.

Paradox VI.

The direct preffure fuftain'd by a body,

placed any where under water, with

its upper furface parallel to the hori-

zon, is that of a column of water,

whofe bafe is the horizontal fuperfi-

cies of the body, and height the per-

pendicular depth of the water: and

if the water preffing upon a body be

contained in open tubes, its preffure

is to be estimated by a column of the

fame, the bafe whereof equals the

lower orifice of the pipe, and height

a perpendicular from thence to the

top of the water: and this tho' the

pipes ftand obliquely, be irregularly

Shaped, or wider in fome parts than

the faid orifice.

P. 303.

8.

Paradox VII.

29. The feveral uses thereof. 334

30. Still other methods for the fame

purpose.

336

337

31. The use and advantages of weigh-
ing one fluid in another.

32. All waters nearly of the fame

weight.

338

33. To difcover the magnitudes of bo-
dies hydrostatically.
ib.

34. To gain the folidity of a body bydro-

Statically, tho' lighter than water.

339

35. What accuracy is to be expected in

hydrostatical experiments. 342

36. A table of the Specific gravities of

bodies compared with water. 344

An hydrostatical difcourfe, by

way of answer to the objections

of Dr. More, and others, against

fome explanations of particular

experiments; with farther con-

fiderations thereon.

M

SECT. I.

Echanical folutions of pheno-

mena, what?

347

2. That the upper parts of fluids gra-

vitate upon the lower.

348

3. Demonftrated by experiments. 350

4. Water made to fupport a body of a

much greater specific gravity than

itself.

353

14. An attempt to kindle a combuftible

body by the fun's rays in vacuo.

p. 421

15. An excited needle in vacuo affect-

ed by the magnet.

16. The Torricellian experiment in

vacuo.

barometer.

ib.

422

17. Odd phenomena of the mercurial

423

18. A like experiment made with wa-

38. The penetrating power of air com-

pared with that of water. 450

rometer.

473

475

SECT. II.

49. The air-pump farther improved.

474

50. Mercury raised by the spring of a

little included air.

51. Much included air raifes mercury

but to the ufual standard of the ba-

476

52. The fpring of included air raifes

mercury nearly to an equal height in

unequal tubes.

477

53. A fountain made by the Spring of
uncompreffed air.

54. Flat glaffes broke by the weight of

the atmosphere, without the affiftance

of a Fuga vacui.

479

55. Blown bladders burft by the spring

of the air included in them. ib.

56. A confiderable weight lifted by the

bare fpring of a little air included in

a bladder.

480

57. Glass-bubbles broke by the fpring of

481

their own air.

ib.

VOL. II.

ib.

64. To make gages for estimating how

far the receiver is exhausted. 488

65. An eafy way to make the preffure of

the air fenfible to the touch.

66. Mercury fubfiding in the Torri-
cellian tube to a level with the ftag-
nant, by extracting the air. ib..
67. In fmall and large open tubes,when
no Fuga vacui can be pretended, the
weight of water raifes quick-filver to
an equal height.

68. The height whereat pure mercury,

and mercury amalgamated with tin,

491

will stand in barometers. 492

69. To make portable barometers. ib.

70. Mercury in a barometer will be

kept fufpended higher at the bottom.

than at the top of a bill.

71. The weight of the air will fustain

the mercury in the barometer, tho'

it press thereon but at a very small.

orifice.

494

ib.