. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. 358 THEORY OF ARCHITECTURE. Book II that necessary to makt it slide, and, reciprocally, it will be overtv Jcd when less force i>necessary to ])rodiice tliat eflect than to make it slide. 1366. II. When tlie parallelopiped is placed on an inclined plane, it will slide so longas the vertical QS drawn from its centre of gravity does not fall without the base , to ascertain whether a parallelopiped A13CD with a rectangular base (^fig. 564.)
. An encyclopaedia of architecture, historical, theoretical, & practical. New ed., rev., portions rewritten, and with additions by Wyatt Papworth. 358 THEORY OF ARCHITECTURE. Book II that necessary to makt it slide, and, reciprocally, it will be overtv Jcd when less force i>necessary to ])rodiice tliat eflect than to make it slide. 1366. II. When tlie parallelopiped is placed on an inclined plane, it will slide so longas the vertical QS drawn from its centre of gravity does not fall without the base , to ascertain whether a parallelopiped A13CD with a rectangular base (^fig. 564.) will slide down or overturn ; fromthe ])oiiit B we must raise the perpendicular BE : if it pass outof tlie centre of gravity, it will slide ; if, on the contrary, theline BE passes within, it will overturn. 1367. If the surfaces of stones were infinitely smooth, asthey are supposed to be in the application of the principles of , they would begin to slide the moment the plane upon which they are placed ceases to be perfectly horizontal ; but as their surfaces are fullof little inequalities which catch one another in their po
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