Appletons' Cyclopædia of Drawing: Designed as a Text-book for the Mechanic, Architect, Engineer, and Surveyor, Comprisng Geometrical Projection, Mechanical, Architectural, and Topographical Drawing, Perspective, and IsometryWilliam Ezra Worthen Appleton, 1857 - 410 σελίδες |
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Αποτελέσματα 1 - 5 από τα 67.
Σελίδα 7
... edge . - Rulers should be of close - grained , thoroughly seasoned wood , such as mahogany , maple , pear , & c . They should be about of an inch thick , bevelled a little on one edge , and from 1 to 2 inches wide , according to their ...
... edge . - Rulers should be of close - grained , thoroughly seasoned wood , such as mahogany , maple , pear , & c . They should be about of an inch thick , bevelled a little on one edge , and from 1 to 2 inches wide , according to their ...
Σελίδα 8
... edge of the ruler against the hypothenuse of the triangle ; if now the ruler be held securely by the left hand , the triangle may be slid along the edge of the ruler , and any line drawn along the upper side of the triangle will be ...
... edge of the ruler against the hypothenuse of the triangle ; if now the ruler be held securely by the left hand , the triangle may be slid along the edge of the ruler , and any line drawn along the upper side of the triangle will be ...
Σελίδα 9
... edge " or ruler , a , fitted at one end with a stock , b , applied transversely at right angles . The stock being so formed as to fit and slide against one edge of the drawing board , the blade reaches over the surface , and presents an ...
... edge " or ruler , a , fitted at one end with a stock , b , applied transversely at right angles . The stock being so formed as to fit and slide against one edge of the drawing board , the blade reaches over the surface , and presents an ...
Σελίδα 10
... edge , as is sometimes done with the object of insuring a correct position of the lines ; for the edge is easily damaged , and the pen is liable to catch the edge , and to leave ink upon it . A small hole should be made in the blade ...
... edge , as is sometimes done with the object of insuring a correct position of the lines ; for the edge is easily damaged , and the pen is liable to catch the edge , and to leave ink upon it . A small hole should be made in the blade ...
Σελίδα 11
... edge and angle , but too heavy in use , and liable of course to fracture . THE COMPASSES OR DIVIDERS . The best compasses are constructed with joints of two different metals , as steel and brass , whereby the wear is more equal , and ...
... edge and angle , but too heavy in use , and liable of course to fracture . THE COMPASSES OR DIVIDERS . The best compasses are constructed with joints of two different metals , as steel and brass , whereby the wear is more equal , and ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
arch architrave axis baluster base beam beam compass belt bisect bolts braces cast iron centre circular circumference color compasses cone construction cornice curve cylinder depth describe arcs diagonal diameter dimensions divide division draw drawn edge elevation ellipse entablature epicycloid feet figure foot frame frustrum given line given point Gothic horizontal line hyperbola inches inclined intersection length light line A B motion mouldings number of equal number of teeth ornament outline ovolo paper parallel perpendicular pitch circle placed Plate polygon position pressure PROB projection proportion pulley purlines radii radius rafters regular polygons represent right angles Romanesque roof scale screw shade shadow shaft side space square straight line strain style surface tangent thickness tint tion tooth tracery transverse distance triangle triglyph upper usual velocity vernier scale wall weight wheel width window wrought iron
Δημοφιλή αποσπάσματα
Σελίδα 3 - 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.
Σελίδα 2 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a Right Angle; and the straight line which stands on the other is called a Perpendicular to it.
Σελίδα 2 - When several angles are at one point B, any one of them is expressed by three letters, of which the letter that is at...
Σελίδα 20 - ... the beginning of this division, or zero point, a distance equal to one of the subdivisions. Now divide the extent thus set off into ten equal parts, marking the divisions on the opposite side of the divided line to the strokes marking the primary divisions and the subdivisions, and number them 1, 2, 3, &c., backwards from right to left Then, since the extent of eleven subdivisions has been divided into ten equal parts, so that these ten parts exceed by one subdivision the extent of ten subdivisions,...
Σελίδα 33 - Then press downwards the branches ee, which will cause the points to make punctures in the paper at opposite sides of the circle; which being afterwards connected, the line will pass through the given angular point, if the instrument was first correctly set. In this manner, at one setting of the instrument, a great number of angles, or a complete circular protractor, may be laid off from the same point. THE T SQUARE AND SEMICIRCULAR PROTRACTOR.
Σελίδα 200 - V4, the exhaustion valve, for opening or closing the communication between the lower part of the cylinder and the condenser. The nozzle chamber above the valve communicates with the cylinder by the lower port n, while to the bottom of the nozzle, under the valve, is attached the eduction pipe H.
Σελίδα 115 - VIII, leads to the following remarkable conclusion, easily fixing itself in the memory, that with the unguents, hogs* lard and olive oil interposed in a continuous stratum between them, surfaces of wood on metal, wood on wood, metal on wood, and metal on metal, when in motion, have all of them very nearly the same co-efficient of friction, the value of that co-efficient being in all cases included between 0,07 and 0,08, and the limiting angle of resistance therefore between 4° and 4° 35'.
Σελίδα 62 - XXXVIII. length AD, the polygon may be completed. The constructions for inscribing regular polygons in circles are suitable also for dividing the circumference of a circle into a number of equal parts. To supply a means of dividing the circumference into any number of parts, including cases not provided for in the foregoing problems, the annexed table of angles relating to polygons, expressed in degrees, will be found of general utility. In this table the angle at TABLE OF POLYGONAL ANGLES.
Σελίδα 111 - To find the weight that will be supported by a known amount of power, the position of the fulcrum being given : Multiply the distance between the power and the fulcrum by the power, and divide the product by the distance between the fulcrum and the weight.
Σελίδα 20 - ... or 2-53, according as the primary divisions are taken as hundreds, tens, or units. General Rule. — To take off any number to three places of figures upon this vernier scale. Increase the first figure by one; subtract the third figure from the second, borrowing one- from- the first increased figure, if necessary, and extend the compasses from the division upon the vernier -scale, indicated by the third figure, to the subdivision indicated by the number remaining after performing the above subtraction.