An essay on mechanical geometry, explanatory of a set of models1796 |
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Page vii
... objects of touch along with objects of fight . In this im- portant business we have hitherto trufted to chance . But ( vii )
... objects of touch along with objects of fight . In this im- portant business we have hitherto trufted to chance . But ( vii )
Page 50
... 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 upright in the hole , to represent the pole ...
... 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 upright in the hole , to represent the pole ...
Page 51
... object to EF the height of the object required . Note , If neither the fun nor moon fhines to caft a fhadow , the height of the object may be found by either of the two next Problems . PROBLEM IO . To find the height of an object with a ...
... object to EF the height of the object required . Note , If neither the fun nor moon fhines to caft a fhadow , the height of the object may be found by either of the two next Problems . PROBLEM IO . To find the height of an object with a ...
Page 52
... object is reflected to the man's eye at D , making the angle BEC and DEA equal . * Hence the triangles are fimilar ... object BC . PROBLEM II . To find the height of an object by a pole . ( Of ufe when there is no fun- fhine nor ...
... object is reflected to the man's eye at D , making the angle BEC and DEA equal . * Hence the triangles are fimilar ... object BC . PROBLEM II . To find the height of an object by a pole . ( Of ufe when there is no fun- fhine nor ...
Page 53
... object in a line ; he is supposed to measure from his feet to the pole , and also from his feet to the object , and also the height of the pole ; then Theorem 10 will again affift us . For if AF represent the C.38 height of the man's ...
... object in a line ; he is supposed to measure from his feet to the pole , and also from his feet to the object , and also the height of the pole ; then Theorem 10 will again affift us . For if AF represent the C.38 height of the man's ...
Other editions - View all
An Essay on Mechanical Geometry, Explanatory of a Set of Models Benjamin Donne No preview available - 2019 |
An Essay on Mechanical Geometry, Explanatory of a Set of Models Benjamin Donne No preview available - 2016 |
Common terms and phrases
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
Popular passages
Page 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.
Page 11 - Magnitudes which coincide with one another, that is, which exactly fill the same space, are equal to one another.
Page 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...
Page 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.
Page 12 - ... the three angles of a triangle are together equal to two right angles, although it is not known to all.
Page 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.
Page 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.
Page 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.
Page 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...
Page 40 - SIMILAR cones and cylinders have to one another the triplicate ratio of that which the diameters of their bases have...