. 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 ... . machine when left to itfelf would make a consi-derable number of Strokes, and be worked with muchlefs labour than if no fly had been ufed, though no -doubt at the firft it would be found a considerable in-cumbrance to the motion. This is equally applicableto the action of pumps ; but the weight which can be,moft advantageoufly given to a fly has never yet beendetermined by mechanics.
. 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 ... . machine when left to itfelf would make a consi-derable number of Strokes, and be worked with muchlefs labour than if no fly had been ufed, though no -doubt at the firft it would be found a considerable in-cumbrance to the motion. This is equally applicableto the action of pumps ; but the weight which can be,moft advantageoufly given to a fly has never yet beendetermined by mechanics. It is certain, however, thatthe fly does not communicate any abfolute increafe ofpower to the machine ; for if a man or other animalis not able to fet any mechanical engine in motionwithout a fly, he will not be able to do it, though afly be applied, nor will he be able to keep it in motionthough Set a-going with a fly by means of a greaterpower. This m>y Seem to be contradicted by theexample of a common clock ; for if the pendulum beonce flopped, the weight is not able to fet it in mo-tion again, though it will keep it going when onceput in motion by an external power. This, however, depends MECHANICS. / ,*i*sA*>r s^**/s. 1 Sett. II. MECHANICS. tsdsss«a;^»^^ r^- 54. Which is fucli, chat when once the pendulum is flop-ped, it would require a much greater weight than thatcommonly applied to fet it in motion ; and if the ufuil -erlballsGH,itwlir--TSi0^3 J C?nal t0 abo«t * third part of the twopounds, l0 glVc motion to or overcome the frictionof }he laid cylinder. 7. Now this additional wdght powers. weight was to aft fairly, it would be i,ore than fuffl ., \,r!£.Cy 7- ^°w tj,is addii°n»l weig] cent to move all the machinery, and mak,,° pen ikt^F^fliP^0^^^- Wil1^dnlutn vtoeate a,fo with tnneh greater foree thi, it -SCMj^JTtj^W the j 8. Gf Friaion. The dodt-ine of friction, according to Mr , may be fummed up in the following manner :I. When one body infifts
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