Self-help Mechanical Drawing: An Educational Treatise |
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Page 36
... diameter with a cone end 3 or 4 inches long , covered with chamois skin or soft cloth tightly wrapped round the cone and fastened with a tack or drawing pin , makes the best implement to erase lines not required , the point of the cone ...
... diameter with a cone end 3 or 4 inches long , covered with chamois skin or soft cloth tightly wrapped round the cone and fastened with a tack or drawing pin , makes the best implement to erase lines not required , the point of the cone ...
Page 43
... diameter . All the diameters of a circle are equal , as are also all the radii CD , CB and C A. An Arc of a circle is any portion of the cir- cumference , as B D and AD . Semi - Circle . - Half a circle formed by bisect- ing it with a ...
... diameter . All the diameters of a circle are equal , as are also all the radii CD , CB and C A. An Arc of a circle is any portion of the cir- cumference , as B D and AD . Semi - Circle . - Half a circle formed by bisect- ing it with a ...
Page 45
... DIAMETER . — A right line passing through the center of a circle or other round figure terminated by the curve and dividing the figure symmetrically into two equal parts . EDGE . The intersection of any two surfaces . ELEVATION . — The ...
... DIAMETER . — A right line passing through the center of a circle or other round figure terminated by the curve and dividing the figure symmetrically into two equal parts . EDGE . The intersection of any two surfaces . ELEVATION . — The ...
Page 90
... diameter of a large fly - wheel , or any other object of large diameter when only a part of the circumference is accessible ; in striking out arches when the span and rise are given , etc. A E Ex . 12. To draw a tangent to. 90 Hawkins ...
... diameter of a large fly - wheel , or any other object of large diameter when only a part of the circumference is accessible ; in striking out arches when the span and rise are given , etc. A E Ex . 12. To draw a tangent to. 90 Hawkins ...
Page 93
... diameters A B , C D at right angles and join the points A B , C D to form the square . In the same way a circle may be described about a triangle Ex . 20.- To inscribe a circle on a square. Hawkins ' Mechanical Drawing . 93.
... diameters A B , C D at right angles and join the points A B , C D to form the square . In the same way a circle may be described about a triangle Ex . 20.- To inscribe a circle on a square. Hawkins ' Mechanical Drawing . 93.
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Common terms and phrases
addendum circle Area axis beam compasses bisect blade Boiler bolt called center line Circum circumference compasses curved line cylinder desc Diam diameter dimensions direction distance dividers dotted draughtsman drawing board drawn edge end view equal erased figure fingers finished free-hand front elevation gear geometry hand Hawkins illus illustration inches India ink instruments length letters Linear Perspective machine measurements mechanical drawing object oblique Office Rules outlines paper parallel lines pencil perpendicular picture plane pitch circle pitch line polygon position practice projection proportion radius represents retina right angles rods scale screw section lines Set-Square shading shaft sheet shop drawings shown in fig shows side views sketch solid space spur gear spur wheel square Steam Engine steel straight line student surface T-square tee-square thickness of tooth three views thumb tion top view triangle vanishing points vertical lines visual rays width
Popular passages
Page 238 - Every line and letter (signatures included) must be absolutely black. This direction applies to all lines, however fine, to shading, and to lines representing cut surfaces in sectional views. All lines must be clean, sharp, and solid, and they must not be too fine or crowded. Surface shading, when used, should be open.
Page 87 - POSTULATES. I. LET it be granted that a straight line may be drawn from any one point to any other point.
Page 240 - ... at the lower lefthand corner, all within the marginal line, but in no instance should they trespass upon the drawings.
Page 18 - ONE step and then another, And the longest walk is ended ; One stitch and then another, And the largest rent is mended ; One brick upon another, And the highest wall is made ; One flake upon another, And the deepest snow is laid.
Page 238 - The scale to which a drawing is made ought to be large enough to show the mechanism without crowding...
Page 95 - From a point P in this line draw the perpendicular P B to the line AB, and on P describe the circle BD, touching the lines and cutting the center line at E. From E draw EF perpendicular to the center line, cutting AB at F, and from Fig.
Page 240 - They should, if possible, measure at least one-eighth of an inch in height, so that they may bear reduction to one twenty-fourth of an inch; and they may be much larger when there is sufficient room.
Page 87 - A Proposition, is something which is either proposed to be done, or to be demonstrated, and is either a problem or a theorem.
Page 88 - AXIOMS. 1. Things which are equal to the same thing are equal to each other. 2. When equals are added to equals the wholes are equal. 3. When equals are taken from equals the remainders are equal.
Page 53 - A sphere is a solid bounded by a curved surface, every point of which is equally distant from a point within called the center.