. Encyclopaedia : or, A dictionary of arts, sciences, and miscellaneous literature; constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises of systems ... . fhall add nothingto the inertia of the matter moved : and it will be con-venient in many demonftrations to alfume the force ofthis kind ; and in this cafe we have not to take the in-ertia into the account. Thus if any number of bodieswithout gravity colleded into the points F, H, £>>(fig. 112.) are caufed to revolve round the axis S, by amoving force P, the force which accelera
. Encyclopaedia : or, A dictionary of arts, sciences, and miscellaneous literature; constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises of systems ... . fhall add nothingto the inertia of the matter moved : and it will be con-venient in many demonftrations to alfume the force ofthis kind ; and in this cafe we have not to take the in-ertia into the account. Thus if any number of bodieswithout gravity colleded into the points F, H, £>>(fig. 112.) are caufed to revolve round the axis S, by amoving force P, the force which accelerates thefe bo- Pdies in their revolution will be£+j-i+Q ; provided the bodies F, H, Q^, be difpoled at a diftance from,the axis of motion equal to the radius of the circleAFGH, at the circumference of which the movingforce Pis applied. In the preceding example, F, H, O, &c. havebeen fuppofed to move with the fame velocity ; bodies revolveat unequaldiu1 ances from the axis,their velocities of motion being different, other ruleswill be neceffary to determine the force whereby anygiven point of the fyftem is accelerated. In demon-ltrating the properties of rotatory motion, the revol- Sea. VI. M E C H A Motion of ving fyftem may be fuppofed to confift of one or morej5od>es. of the bodies A, B, C : the magnitude of thefe may be fuppofed evanefcent ; becaufe, were the contrary adopted, the particles in each body wouldbe impelled by different moving forces, and exert dif-ferent degrees of Inertia in op poll t ion to the commu- N I C S. 7gj which accelerates D, therefore, cannot be obtained by Motion ofdividing P by A+B-fC ; but if an equivalent mafs, Bo«e*,or a quantity of matter, can beaffigned, which being collected into any poi:>tsof the circumference a, t, c,will caufe an inertia or remittance to the motion of Dequal to that exerted by the particles A, B, C, when nicariem or motion. But the force which impels each rcvolvingatthcirrefpectivc
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