## Recreations in mathematics and natural philosophy, recomposed by m. Montucla and tr. by C. Hutton1840 |

### From inside the book

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**perpendicular**line . " 16 JEAN ETIENNE MONTUCLA ( who so greatly enlarged and improved the " Recreations " of Ozanam , that he may be said to have made the work his own , ) was the son of a merchant at Lyons , where he was born on Sept ... Page 12

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**perpendicular**direction ; you may perform , by means of this machine , all the different opera- 953 tions of arithmetic . The reader will find ( Fig . 5. ) a representation of the method of adding three num- 1631 bers , and expressing ... Page 75

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**perpendicular**rows , H and 1 ; if you therefore ask in which row it is , you may easily point it out ; and as it is here supposed that each of the counters has some distinguishing mark , you may desire them to be mixed together , and ... Page 114

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**perpendicular**, without continuing the line , and even without changing the opening of the compass if necessary . E Fig . 1 . I. LET A B ( Fig . 1. ) be the given straight line , and A the ex- tremity , from which it is required to ... Page 115

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**perpendicular**. Fig . 5 . D G Divide the given line A B ( Fig . 5. ) into two equal parts , A C and CB ; and from the point c draw , any how at pleasure , the line cd ; make C D equal to CA ; draw Da h , and make A E equal to a C , and ...### Contents

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### Other editions - View all

Recreations in Mathematics and Natural Philosophy, Recomposed by M. Montucla ... Jacques Ozanam No preview available - 2018 |

Recreations in Mathematics and Natural Philosophy, Recomposed by M. Montucla ... Jacques Ozanam No preview available - 2015 |

Recreations in Mathematics and Natural Philosophy, Recomposed by M. Montucla ... Jacques Ozanam No preview available - 2019 |

### Common terms and phrases

angle appear Archimedes arithmetical progression axis blue body camera obscura centre of gravity circumference colours concave concave mirror consequently constructed contains convex cube cylinder degrees describe diameter divided dominical letter double draw drawn earth eclipse ellipsis employed epact equal example feet figure focus geometrical geometrical progression geometricians give glass greater half hole horizontal inches inclined inclined plane inscribed intersect invented Julian period kind latter length less light lunule machine magic square manner means method microscope moon motion multiply nearly object observed parallel Parcieux pass perpendicular person polygon PROB PROBLEM produced proportion radius ratio rays rectangle rectilineal reflected refraction remainder retina shew side sine solar solar cycle squarable square straight line subtract suppose surface telescope third trapezium triangle tube vertical vessel vibrations weight

### Popular passages

Page 254 - A CENTURY OF THE NAMES AND SCANTLINGS OF SUCH INVENTIONS, as at present I can call to mind to have tried and perfected...

Page 333 - Difference of colour if therefore not a test of difference of refrangibility, and the conclusion deduced by Newton is no longer admissible as a general truth : " That to the same degree of refrangibility ever belongs the same colour, and to the same colour ever belongs the same degree of refrangibility.

Page 138 - From this it is manifest that the side of the hexagon is equal to the radius of the circle.

Page 475 - The rings of Saturn must present a magnificent spectacle from those regions of the planet which lie above their enlightened sides, as vast arches spanning the sky from horizon to horizon, and holding an invariable situation among the stars. On the other hand, in the regions beneath the dark side, a solar eclipse of fifteen years...

Page 254 - An admirable and most forcible way to drive up water by fire, not by drawing or sucking it upwards, for that must be as the philosopher calleth it, infra spheeram activitatis, which is but at such a distance. But this way hath no bounder, if the vessels be strong enough ; for I have taken a piece of a whole cannon, whereof the end was burst, and filled it...

Page 344 - And if he hold out his hand towards the mirror, the hand of the image will come out towards his hand, and coincide with it, of an equal bulk, when his hand is in the centre of concavity; and he will imagine he may shake hands with his image.

Page 450 - But since the mean synodic motion of the moon is at the rate of 30" per minute, it follows that the duration of a total solar eclipse can never exceed four minutes.

Page 254 - One vessel of water rarefied by fire driveth up forty of cold water, and a man that tends the work has but to turn two cocks; that one vessel of water being consumed, another begins to force and refill with cold water, and so successively ; the fire being tended and kept constant, which the selfsame person may likewise abundantly perform in the interim between the necessity of turning the said cocks.

Page 333 - ... very little of the violet. The yellow space, which has not been much absorbed, has increased in breadth. It occupies part of the space formerly covered by the orange on one side, and part of the space formerly covered by the green on the other. Hence it follows, that the blue glass has absorbed the red light, which, when mixed with the yellow light, constituted orange, and has absorbed also the blue light, which, when mixed with the yellow, constituted the part of the green space next to the...

Page 291 - ... each side, make two marks ; then place yourself directly opposite to the paper, and hold the end of your finger before your face in such a manner, that when the right eye is open, it shall conceal the mark on the left, and, when the left eye is open, the mark on the right : if you then look with both eyes to the end of your finger, the paper, which is not at all concealed by it from either of your eyes, will, nevertheless, disappear.