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arch architecture architrave axis balusters base beam bisect bolts braces brick cast iron centre circular circumference color cone construction cornice curve cylinder depth determined diagonal diameter direction distance divide doors draw drawn edge elevation ellipse entablature epicycloid feet figure floor foot frame frustrum gamboge given line given point Gothic horizontal plane hyperbola inches inclined Indian ink intersection length light line A B mouldings number of equal number of teeth ornament outline ovolo paper parallel perpendicular pitch circle placed plane of projection Plate polygon position pressure PROB proportion pulley purlines radii radius rafters represent Romanesque roof scale screw shade shaft side soffits space square straight line strain style surface tangent thickness tint tion tooth tracery triangle triglyph upper usual velocity vertical plane walls weight wheel width wrought iron
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 80 - The projection of a point upon a plane is the foot of the perpendicular from the point to the plane.
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 121 - The strength of a pillar, with one end round and the other flat, is the arithmetical mean between that of a pillar of the same dimensions with both ends round, and one with both ends flat. Thus, of three...
Σελίδα 33 - This done, press the protractor gently down, which will fix it in position by means of very fine points on the under side. It is now ready to lay off the given angle, or any number of angles that may be required, which is done by turning the pinion d till the opposite vernier reads the required angle. Then press downwards the branches...
Σελίδα 117 - 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 384 - Having poured a little of the solution into a flat dish, the pictures are to be introduced into it one by one; daylight will not now injure them ; let them soak for two or three minutes, or even longer if strongly printed, turning and moving them occasionally. The remaining unreduced salts of silver are thus thoroughly dissolved, and may now, with...
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.
Σελίδα 38 - MOUNTING PAPER AND DRAWINGS, VARNISHING, ETC. In mounting paper upon canvas, the latter should be well stretched upon a smooth flat surface, being damped for that purpose, and its edges glued down as was recommended in stretching drawing paper. Then with a brush spread strong paste upon the canvas, beating it in till the grain of the canvas be all filled up; for this, when dry, will prevent the canvas from shrinking when subsequently removed ; and, having cut the edges of the paper straight, paste...