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 13
... draw the straight line AC . 5. From the point B to the point C , draw the ftraight line BC . BECAUSE DEMONSTRATION . ECAUSE the point A is the center of O BCD ( Ref . 1. ) , and the lines AB , AC , are drawn from the center A to the O ...
... draw the straight line AC . 5. From the point B to the point C , draw the ftraight line BC . BECAUSE DEMONSTRATION . ECAUSE the point A is the center of O BCD ( Ref . 1. ) , and the lines AB , AC , are drawn from the center A to the O ...
Page 14
... draw a straight line ( AL ) , equal to a given traight line ( BC ) . Given 1. The point A. Sought AL BC . 2. The ftraight line BC . Refolution . 1. From the point A to the point B , draw the ftraight line AB . 2. Upon this ftraight line ...
... draw a straight line ( AL ) , equal to a given traight line ( BC ) . Given 1. The point A. Sought AL BC . 2. The ftraight line BC . Refolution . 1. From the point A to the point B , draw the ftraight line AB . 2. Upon this ftraight line ...
Page 15
Joseph Fenn. A E F B D PROBLEM III . PROPOSITION III . Two WO unequal straight lines ... draw the ftraight line CE to the given one A. P. 2. B. 1 . 2. From the ... straight line CB being likewife to CE ( Arg . 2. ) . 3. The ftraight line A is ...
Joseph Fenn. A E F B D PROBLEM III . PROPOSITION III . Two WO unequal straight lines ... draw the ftraight line CE to the given one A. P. 2. B. 1 . 2. From the ... straight line CB being likewife to CE ( Arg . 2. ) . 3. The ftraight line A is ...
Page 20
... drawn to the fame point ( C ) , two straight lines ( AC , BC , ) : there cannot be drawn to any other point ( D ) fituated on the fame fide of this line , two other straight lines ( AD , BD , ) , equal to the two firft each to each ...
... drawn to the fame point ( C ) , two straight lines ( AC , BC , ) : there cannot be drawn to any other point ( D ) fituated on the fame fide of this line , two other straight lines ( AD , BD , ) , equal to the two firft each to each ...
Page 25
... straight line DE , conftruct the equilateral △ DFE . 3. From the point F to the point C , draw the ftraight line FC . BECAUSE DEMONSTRATION . AUSE CD is to CE ( Ref . 1. ) , FD = FE ( Res . 2. ) , & the fide CF is common to the two ...
... straight line DE , conftruct the equilateral △ DFE . 3. From the point F to the point C , draw the ftraight line FC . BECAUSE DEMONSTRATION . AUSE CD is to CE ( Ref . 1. ) , FD = FE ( Res . 2. ) , & the fide CF is common to the two ...
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Common terms and phrases
ABCD alfo alſo arch bafe baſe becauſe Bodies Cafe caufe centrifugal Force circle Cofine Comet cone Confequently cylinder defcribed demonftrated Diameter diſcovered Diſtance draw the ftraight Earth ECAUSE Ecliptic equal Equator equiangular equimultiples fame altitude fame manner fame multiple fame plane fame ratio fecond fegment fhall fhewing fhould fide AC fimilar fince firft firſt folid fome Force fquare ftraight lines AC fuch fuppofed Gravity greateſt heliocentric Hypothefis impoffible interfect Jupiter lefs Likewife line A B magnitude Meaſure Moon moſt Motion Newton Nodes Number Obfervations oppofite Orbit pafs thro parallelepiped Perihelion plle Prep prifm proportional PROPOSITION pyramid Rays rectilineal figure Revolution Rgle right angles Saturn ſphere Syfigies Syftem Tangent thefe Thefis THEOREM theſe thofe thoſe Tides tion triangle true Anomaly Vafe Wherefore whofe
Popular passages
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 8 - Let it be granted that a straight line may be drawn from any one point to any other point.
Page xxviii - This depends upon three suppositions: — first, that all celestial bodies whatsoever have an attraction or gravitating power towards their own centres, whereby they attract not only their own parts and keep them from flying from them, as we may observe the earth to do, but that they do also attract all the other celestial bodies that are within the sphere of their activity...
Page 164 - VII. 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...
Page 29 - Therefore if two straight lines, &c. QED COR. 1. From this it is manifest, that, if two straight lines cut one another, the angles they make at the point where they cut, are together equal to four right angles.
Page 29 - Cor. 2. And consequently that all the angles made by any number of lines meeting in one point, are together equal to four right angles.
Page xxviii - Saturn also, by their attractive powers, have a considerable influence upon its motion, as in the same manner the corresponding attractive power of the earth hath a considerable influence upon every one of their motions also.
Page xxviii - The third supposition is that these attractive powers are so much the more powerful in operating, by how much the nearer the body wrought upon is to their own centers. Now what these several degrees are I have not yet experimentally verified...