## Text Book of Mechanical Drawing ... (Google eBook) |

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### Common terms and phrases

addendum addendum circle angle G A C angle of action apex auxiliary planes auxiliary view axial pitch axis base circle central vertical plane circle of centres circular pitch circumference Column cosine cutting plane diametral pitch distance divided draw arcs draw the curve Draw the Development draw the trace drawing and development drawing circles drawn ellipse equal to one-half external shading flank front and side front elevation front vertical plane gear marked helix hexagonal pyramid horizontal cylinder inch pitch intersect the trace involute lead-screw length line of action locate number of teeth number of threads perpendicular pinion pitch diameter pitch-circle pitch-line pitch-point plane as shown planes of projection Plate 22 prism projecting lines pupil radius root diameter screw screw thread side elevation spiral angle spiral gear spur-gear straight line surface tangent threads per inch tooth traces intersect triangle vertical cone vertical cylinder

### Popular passages

Page 58 - A Segment is any part of a circle bounded by an arc and its chord.

Page 60 - Circular pitch is the distance from the centre of one tooth to the centre of the next tooth, measured along the pitch circle.

Page 59 - The circumference of every circle is supposed to' be divided into 360 equal parts, called degrees ; each degree into 60 minutes, and each minute into 60 seconds. Degrees, minutes, and seconds are designated by the characters °, ', ". Thus 23° 14' 35" is read 23 degrees, 14 minutes, and 35 seconds.

Page 52 - The circular pitch is the distance along the pitch circle from the center of one tooth to the center of the next.

Page 28 - A hyperbola is a curve formed by a section of a cone, when the cutting plane makes a greater angle with the base than the side of the cone makes.

Page 58 - A sine of an arc is a right line drawn from one extremity of an arc perpendicular to a diameter passing through the other extremity, as AB.

Page 26 - ... arc is equal to the circumference of the base of the cone.

Page 80 - PITCH AND LEAD OF SCREW THREAD. The terms " pitch " and " lead " of screw threads are often confused. The pitch of a screw thread is the distance from the center of one thread to the center of the next thread, whether the screw has a single, double, triple, or quadruple thread.

Page 58 - Cir'cle, n. (L. circus) a line continued till it ends where it began, having all its parts equidistant from a common centre ; the space included in a circular line ; a round body ; an orb ; compass ; a surrounding company.

Page 48 - ... through the apex of the cone and parallel to the axis of the cylinder.