An essay on mechanical geometry, explanatory of a set of models1796 |
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Seite 46
... purpose , for small fchemes . Corollary . To know if the square be true , turn it , as represented by the unshaded one C.31 FCD , and then , if both ways will form the fame right line , the fquare is true ; if not , the angle formed ...
... purpose , for small fchemes . Corollary . To know if the square be true , turn it , as represented by the unshaded one C.31 FCD , and then , if both ways will form the fame right line , the fquare is true ; if not , the angle formed ...
Seite 47
... purpose there is generally ( but not always ) in a pocket - cafe of inftruments a parallel ruler . Euclid's method of drawing parallel lines is true in theory but not in practice . The eafieft and beft methods , if you have not a ...
... purpose there is generally ( but not always ) in a pocket - cafe of inftruments a parallel ruler . Euclid's method of drawing parallel lines is true in theory but not in practice . The eafieft and beft methods , if you have not a ...
Seite 48
... purpose in the pocket - cafes is generally a femicircle in brass , named a protractor , divided into 180 degrees , and numbered forwards and backwards . C.35 Figure 1 represents the manner of laying the protractor in the center at the ...
... purpose in the pocket - cafes is generally a femicircle in brass , named a protractor , divided into 180 degrees , and numbered forwards and backwards . C.35 Figure 1 represents the manner of laying the protractor in the center at the ...
Seite 50
... purposes . ALTIMETRY , Or taking Heights of Objects . PROBLEM 9. To find the height of an object by the fhadow of a pole ; made either by the fun or moon . Take the board , and screw on the pillar , and put one end of the brass wire ...
... purposes . ALTIMETRY , Or taking Heights of Objects . PROBLEM 9. To find the height of an object by the fhadow of a pole ; made either by the fun or moon . Take the board , and screw on the pillar , and put one end of the brass wire ...
Seite 54
... purpose , and draw a line in that direction ; measure the distance from A to B , and taking off from a fcale of equal parts the number re- presenting that measured diftance , fet it off on the line , and where that distance falls make ...
... purpose , and draw a line in that direction ; measure the distance from A to B , and taking off from a fcale of equal parts the number re- presenting that measured diftance , fet it off on the line , and where that distance falls make ...
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An Essay on Mechanical Geometry, Explanatory of a Set of Models Benjamin Donne Keine Leseprobe verfügbar - 2019 |
An Essay on Mechanical Geometry, Explanatory of a Set of Models Benjamin Donne Keine Leseprobe verfügbar - 2016 |
Häufige Begriffe und Wortgruppen
180 degrees alfo alſo Analemma angle ACD arithmetic arithmetical mean bafe baſe bifect Book breadth Briſtol called circle circumfcribing compaffes conceived cone confequently contained Corollary croffing cylinder demonftrations deſcribe diameter diſtance divided effay Euclid exactly expreffed faid fame number femicircle fhall fhewn fhould fides fignifies figure fimilar fmall folid fome four numbers fquare feet fruftum ftands ftraight fubtract fufficiently furface gallons geometrical mean Geometricians Geometry globe height Hence inftance interfect large cube length manifeft meaſure multiply half muſt number of degrees number of feet numbers are proportional oppofite orem parallel lines parallel ruler parallelogram perpendicular planes pofition pole prefent priſm PROBLEM propofitions purpoſe pyramid radius reaſon rectangle regular polygon repreſent reſpect rhombus right angles right line ſcheme Scholium ſet ſhadow ſhall ſquare Theorem theſe Thomas Beddoes thoſe three angles triangle ABC whole yards
Beliebte Passagen
Seite 4 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds.
Seite 11 - Magnitudes which coincide with one another, that is, which exactly fill the same space, are equal to one another.
Seite 23 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz. either the sides adjacent to the equal...
Seite 24 - If two triangles have the three sides of the one equal to the three sides of the other, each to each, the triangles are congruent.
Seite 12 - ... the three angles of a triangle are together equal to two right angles, although it is not known to all.
Seite 37 - A right circular cone is often called a cone of revolution, because it can be generated by the revolution of a right-angled triangle about one of its shorter sides.
Seite 10 - POSTULATES. 1. LET it be granted that a straight line may be drawn from any one point to any other point. 2. That a terminated straight line may be produced to any length in a straight line. 3. And that a circle may be described from any centre, at any distance from that centre.
Seite 65 - Multiply half the circumference by half the diameter, and the product will be the area. Or, divide the product of the whole circumference and diameter -by 4, and the quotient will be the area. 2. Multiply the square of the diameter by .7854, and the product will be the area.
Seite 84 - ... reafonable creatures •, for though we all call ourfelves fo, becaufe we are born to it if we pleafe, yet we may truly fay Nature gives us but the...
Seite 40 - SIMILAR cones and cylinders have to one another the triplicate ratio of that which the diameters of their bases have...