## Dictionary of the Mathematical and Physical Sciences, According to the Latest Improvements and Discoveries |

### From inside the book

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Page 1

This apparent motion is so minute, that it could never have been discovered by

Bradley, astronomer royal, was led to it accidentally by the result of some careful

...

This apparent motion is so minute, that it could never have been discovered by

**observations**, unless they had been made with extreme care and accuracy. Dr.Bradley, astronomer royal, was led to it accidentally by the result of some careful

...

Page 16

He

his banners pointed upwards; which, he says, could not be the effect either of his

ascent or descent, as he was moving horizontally at the time. At last ...

He

**observed**, also, with surprise, the effects of the wind, and that the streamers ofhis banners pointed upwards; which, he says, could not be the effect either of his

ascent or descent, as he was moving horizontally at the time. At last ...

Page 17

The only philosophical instrument which he carried with him was a thermometer,

which, in the course of his voyage stood as low as 29°, and he

drops of water collected round the balloon were frozen. The second aerial ...

The only philosophical instrument which he carried with him was a thermometer,

which, in the course of his voyage stood as low as 29°, and he

**observed**that thedrops of water collected round the balloon were frozen. The second aerial ...

Page 30

In the case of an inaccessible object, two

that above, in which the only variable lines will be GF and CA. Let, therefore, the

side of the square = s, and the variable part GF = a, in the first

as ...

In the case of an inaccessible object, two

**observations**must be made similar tothat above, in which the only variable lines will be GF and CA. Let, therefore, the

side of the square = s, and the variable part GF = a, in the first

**observation**, andas ...

Page 32

Hence we have, according to the preceding principles, the following rule for

measuring altitudes by the barometer, viz

the bottom of the object to be measured, and again at its top; as also the degree

of the ...

Hence we have, according to the preceding principles, the following rule for

measuring altitudes by the barometer, viz

**Observe**the height of the mercury atthe bottom of the object to be measured, and again at its top; as also the degree

of the ...

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Dictionary of the Mathematical and Physical Sciences: According to the ... James Mitchell No preview available - 2017 |

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### Common terms and phrases

absciss Algebra altitude appears Arithmetic Astronomy axis body called centre circle co-efficients conic sections consequently cosine cube curve cycloid cylinder degree denominator denote diameter distance diurnal motion divided divisor earth ecliptic ellipse equa equal equation feet figure fluid fluxion force formula fraction frustrum Geometry given glass gravity greater greatest heat Hence horizon hyperbola inches instrument latitude length less logarithm longitude means measure mercury meridian method moon motion multiplied neral object observed orbit ordinate parabola parallax parallel passing perihelion perpendicular plane poles produced proportion quantity radius ratio rays refraction right angles right ascension right line roots side signs sine solid space specific gravity sphere spherical square stars subtangent supposed surd surface tangent telescope tion triangle tube velocity weight whence wind

### Popular passages

Page 456 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.

Page 524 - In higher works on trigonometry, it has been demonstrated that, in any triangle, the sines of the angles are proportional to the lengths of the sides opposite to them. In other words, sin A : sin B :: BC : AC; or, sin A : sin C:: BC : AB, and sin B : sin C::AC : A B. Hence, we have sin 44° 40' : sin 56° 20

Page 312 - A law presupposes an agent ; for it is only the mode, according to which an agent proceeds : it implies a power ; for it is the order, according to which that power acts. Without this agent, without this power, which are both distinct from itself, the law does nothing ; is nothing. The expression, ' the law of metallic nature...

Page 209 - ... winch, with as little labour as it takes to wind up a jack, though the weight of the iron, tin, and wooden circle, is about 1000 pounds.

Page 78 - In foul weather, when the mercury rises much and high, and so continues for two or three days before the foul weather is quite over, then expect a continuance of fair weather to follow.

Page 215 - Specific Gravity of a body is the relation of its weight, compared with the weight of some other body of the same magnitude. A body immersed in a fluid will sink if its specific gravity be greater than that of the fluid; but if it be less, the body will rise to the top, and will be only partly uncovered.

Page 490 - ... the object he views. There is no small speculum, but the magnifiers are applied immediately to the first focal image. From the opening of the telescope, near the place of the eye glass, a speaking-pipe runs down to the bottom of the tube, where it...

Page 412 - Multiply the numerators together for a new numerator, and the denominators together for a new denominator.

Page 467 - And in measuring any of these station-distances, mark accurately where these lines meet with any hedges, ditches, roads, lanes, paths, rivulets, &c ; and where any remarkable object is placed, by measuring its distance from the station-line ; and where a perpendicular From it cuts that line. And thus as you go along any main...

Page 15 - ... of the motion seemed to be from the upper part downwards. It appears also that they were in some danger of having the balloon burnt altogether; as the Marquis observed several round holes made by the fire in the lower part of it, which alarmed him considerably, and, indeed, not without reason.