## Instructions Given in the Drawing School Established by the Dublin Society: Course of mathematicks. System of the physical world. System of the moral world. Plan of the military art. Plan of the marcantile arts. Plan of naval art. Plan of mechanic arts. The elements of EuclidA. M'Culloch, 1769 - Mathematics |

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Page cxliii

... Angles , mounted on a graduated Circle , with an Index for determining the Angles of Refraction . Two Prifms of ...

... Angles , mounted on a graduated Circle , with an Index for determining the Angles of Refraction . Two Prifms of ...

**Right**-**angled**triangular Prism . 5th . A large triangular Prifm of Rock Crystal mounted on a graduated Circle ... Page cxlv

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**Right**-**angles**to the Tube . 2d . A Newtonian Telescope , with which lescopes , Mi the Objects are viewed sideways , or in a Line which forms an acute croscopes , Angle with the incident Rays of those Objects . 3d . A catoptrical Te ... Page cxlviii

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**Angles**on Land . Instruments A meridian Telescope or a passage Instrument , four Feet long , the Qua- drant , the ...**right**Afcenfions and Declinations of the celestial Bodies . 2d . A Micrometer to be applied to an astrono- mical ... Page 3

... angles ( ABD , ABC , ) equal to one another , each of the angles is called a

... angles ( ABD , ABC , ) equal to one another , each of the angles is called a

**right angle**; and the straight line ( AB ) which stands on the other ( CD ) is called a perpendicular . Fig . 7 . ΧΙ . An Obtufe Angle , ( ABC ) is that which ... Page 6

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**right angle**. Fig . 19 . XXVIII . An Obtuse angled Triangle , is that which has an obtuse angle , ( A ) . Fig . 20 . ΧΧΙΧ . An Acute angled Triangle , is that which has three acute angles ... angles**right angles**. Fig . 22 . XXXI . An ...### Other editions - View all

### Common terms and phrases

ABCD alfo alſo altitude arch Axis bafe baſe becauſe Bodies Cauſe chords circle Comet cone Conſequently cylinder demonſtrated DEMONSTRATION deſcribe diameter Diſtance draw the ſtraight Earth ECAUSE Ecliptic equal Equator equiangular equimultiples fame manner fame multiple fides AC fimilar fince firſt folid Force given Glaſs Gravity Hypothefis impoſſible interfect inverſe Jupiter leaſt leſs Likewife magnitude Meridian Moon moſt Motion neceſſary Newton Nodes Number Obſervations oppoſite Orbit parallelepiped parallelogram paſs paſſes thro Perihelion plane plle Poſition Prep priſm produced proportional PROPOSITION pyramid Quadratures ratio Rays rectilineal figure reſpect Rgle right angles ſame Saturn ſecond ſegment ſenſible ſerve ſhall ſhewing ſhewn ſhould ſide ſmall ſphere ſquare ſuch ſuppoſed Syſtem Tangent THEOREM theſe Theſis thoſe Tides tion triangle true Anomaly Wherefore whoſe

### Popular passages

Page 8 - Let it be granted that a straight line may be drawn from any one point to any other point.

Page 4 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.

Page 164 - When of the equimultiples of four magnitudes (taken as in the fifth definition), the multiple of the first is greater than that of the second, but the multiple of the third is not greater than the multiple of the fourth ; then the first is said to have to the second a greater ratio than the third magnitude has to the fourth : and, on the contrary, the third is said to have to the fourth a less ratio than the first has to the second. VIII. " Analogy, or proportion, is the similitude of ratios.

Page 165 - When four magnitudes are continual proportionals, the first is said to have to the fourth the triplicate ratio of that which it has to the second, and so on, quadruplicate, &c., increasing the denomination still by unity, in any number of proportionals.

Page 241 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, etc.

Page xxviii - ... bodies that are within the sphere of their activity, and consequently, that not only the sun and moon have .an influence upon the body and motion of the earth, and the earth upon them, but that...

Page 165 - When three magnitudes are proportionals, the first is said to have to the third the duplicate ratio of that which it has to the second.

Page 226 - Equiangular parallelograms have to one another the ratio which is compounded of the ratios of their sides.

Page xiv - Oh! qui m'arrêtera sous vos sombres asiles? Quand pourront les neuf Sœurs, loin des cours et des villes, M'occuper tout entier, et m'apprendre des deux Les divers mouvements inconnus à nos yeux, Les noms et les vertus de ces clartés errantes Par qui sont nos destins et nos mœurs différentes.

Page xxviii - Now what these several degrees are I have not yet experimentally verified; but it is a notion which, if fully prosecuted, as it ought to be, will mightily assist the astronomers to reduce all the celestial motions to a certain rule, which I doubt will never be done true without it.