. 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 ... . o produce a violent anduniform preffure upon any broad and flat furface. As the preffure upon a fingle point may thus bedifFufed over a broad furface, fo may that upon abroad furface be concentrated upon a fingle point ora furface of fmall dimenfion, as in fig. 6. Here it isplain that whatever preffure is applied to the line AB,or any part of it in a perpendicular direction, muft bef
. 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 ... . o produce a violent anduniform preffure upon any broad and flat furface. As the preffure upon a fingle point may thus bedifFufed over a broad furface, fo may that upon abroad furface be concentrated upon a fingle point ora furface of fmall dimenfion, as in fig. 6. Here it isplain that whatever preffure is applied to the line AB,or any part of it in a perpendicular direction, muft befuftained by the point D; for if there was no refift-ance, this point would be driven along with the lineAB, and the moment it was flopped the power whichurged it on muft likewife be flopped. It is true, thatunlefs the power act directly perpendicular to the pointD, or the line CD be fuppofted that it cannot moveeither to oneiide or to another, the impulfe willbebut momentary ; but of this we fhall treat at large inthe fubfequent part of this article. On the principlejufl mentioned depends in a great degree the force ongimblets, augers, boring gimblets, &c. § 4. Of //a/r^d ria»- ccLxxxn:. ////./</.. ME CHANICS
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