Page images


Art. 1. Definition of a fluid. 2. Of pressure. 3. Measure of
pressure. 4. A fluid may become solid without disturbing its equili-
brium. 5. Fluids press equally in all directions. 6. Equilibrium of
forces applied to pistons. 7. Virtual velocities of the pistons are as
the forces applied to them.

[blocks in formation]

Art. 28. The pressure of the atmosphere. 29. Correction for
temperature. 30. Relation between the pressure and volume of air.
31. Ratio of the pressure to the density at 0°. 32. Ratio of the
pressure to the density at any temperature. 33. Heat developed
by compression. 34. Surface of equal pressure a horizontal plane.
35. The difference of the altitudes of two stations determined by
the barometer. 36. The same, taking into account the variation of
gravity. 37. Relation between the pressure and volume of vapour
and gases.

52. The

53. The

[blocks in formation]

the waste is not supplied. 62. The motion of a fluid in a tube. 63. The
motion of a small disturbance. 64. Integration of day a2day.
65. The velocity of a small disturbance. 66. The velocity of sound.


Art. 67. Definition of resistance. 68. The resistance on a plane
perpendicular to the stream.
obliquely to the stream. 70.
71. On a solid of revolution. 72. On a sphere.

69. The resistance on a plane exposed
The resistance on a cylindrical surface.

Art. 73. Expansion by heat. 74. The thermometer.
75. The

graduation of a thermometer. 76. The standard points. 77. The

comparison of different scales. 78. The apparent expansion of

mercury in glass. 79. The cubic expansion of a solid is equal to

three times its linear expansion. 80. Bramah's press. 81. The

diving bell. 82. Space occupied by the air in it. 83. The syphon.

84. The common pump. 85. The height through which the water

rises at each stroke. 86. The range of the piston. 87. The range

in a pump of uniform diameter. 88. The forcing pump. 89. The

fire engine. 90. The condenser. 91. The density of the air in it.

92. The gauge. 93. Hawksbee's air pump. 94. The density of the

air in it. 95. Smeaton's air pump. 96. The receiver. Valves. 97. The

barometer gauge. 98. The syphon gauge. 99. The common ba-

rometer. 100. The comparison of the specific gravities of air and

water. 101. The weight of a given volume of water. 102. The

comparison of the specific gravities of a solid and of a fluid by

weighing the solid in air and in fluid. 103. When the weight of the

solid is less than the weight of the fluid displaced. 104. To compare

the specific gravities of two fluids by weighing the same solid in each.

105. By weighing equal volumes of each. 106. To compare the

specific gravity of a solid in fragments with that of a fluid. 107. The

common Hydrometer. 108. Sikes' Hydrometer. 109. Nicholson's

Hydrometer. 110. Meikle's Hydrometer. 111. Say's instrument

for measuring the volumes of small solids. 112. The Piezometer.

113. The Hydraulic Ram. 114. The Atmospheric Steam Engine.

115. Watts' double acting Steam Engine.

Art. 116. Experimental proof that fluids press equally in all

directions. 117. Pressure on any surface. 118-140. Examples.
141. Daniell's barometric formula. 142. Pressure of steam. 143. Ex-
pansion of water by heat. 144. Table of densities.

« PreviousContinue »