diagram (diagram)

[F. diagram me, Many a fair precept in poetry is like a seeming demonstration in the mat hem a ticks; very specious in the dia gram, but failing in the mechanick operation. Dryden. 2. An illustrative figure giving only the outlines or a general scheme (not an exact representation) of the object; a figure for ascertaining or exhibiting certain relations between objects under discu ion by means of analogous relations between the parts of the figure. a large of diagrams, exhibiting con Dr. Dalton, in his Flements of Cheming what bished ceived to be the configuration of the atoms in a great number of the most common combinations of chemical Whewell, Hist. Scientific Ideas, vii. 3. elements. A diagram is a figure drawn in such a manner that the geometrical relations between the parts of the figure help us to understand relations between other objects. Clerk Maxwell, Encyc. Brit., VII. 149. 3. In old music, a table representing all the sounds of the system; a musical scale. - Acceleration-diagram. (a) A diagram in which the relative positions of points represent in magnitude and direction the relative accelerations of particles. Also called accelera IMG:content-2551.png:[blocks in formation] +-atel.] A strong purgative in which scammony is an ingredient. sented by lines. - Frame-diagram, a diagram of a frame in which the positions of the axes of the joints are shown by points, while rigid or elastic connections are shown lines between the points. Such a diagram of the configuration of the frame is, in graphical statics, united with a dia gram of the forces, the latter being so resolved that all the components pa through joints. By means of a second diagram, the frame-diagram is then completed by the addition of the resultant diagram. - Funicular diagram, a diagram in which every joint of a frame is represented by a funicular polygon, and every link in the frame by a line, the side of a funicular polygon or polygons. Also called stre - diagram. Indicator-diagram, the diagram traced by the steam-indicator. The diagram is a curve having rectangular coordinates of which the absci as represent distances of piston-travel from the beginning of the stroke and the ordinates pre ures at these distances. The area of the diagram measures the total work per formed by the piston during the stroke. This work, pre ed in foot-pounds, divided by Joule's equivalent, gives the heat-equivalent of the work performed, in British thermal units. (See indicator.) These diagrams may be obtained from nearly all kinds of heat-engines. Also