EMfc 



BMP 



-always tried the propositions practically, 

 making all the different parts himself on 

 a small scale ; so that his house was tilled 

 with all kinds of mechanical instruments, 

 together or disjointed. He would fre- 

 quently stand up to his middle in water 

 while fishing, a diversion lie was remark- 

 ably fond of. He used to study incessant- 

 ly for some time, and then for relaxation 

 take a ramble to any pot ale house, 

 where he could get any body to drink 

 with, and talk to. The late Mr. Montague 

 was very kind to Mr. Emerson, and ofien 

 visited him, being pleased with his con- 

 versation, and used frequently to come 

 to him in the fields where he was work- 

 ing, and accompany him home, but could 

 never persuade h,m to get into a car- 

 riage ; on these occasions he would some- 

 times exclaim, *' Damn your whim- 

 wham! 1 had rather walk." He was a 

 married man, and his wife used to spin 

 on an old fashioned wheel of his own 

 making, a drawing of which is given in 

 his * Mechanics." 



Mr. Emerson, from his strong, vigorous 

 mind, and close application, had acquired 

 deep knowledge of all the branches of 

 mathematics and physics, upon all parts 

 of which lie wrote good treatises, though 

 in a rough and unpolished stile and man- 

 ner. He was not remarkable, however, 

 for genius, or discoveries of his own, as 

 his works hardly show any traces of ori- 

 ginal invention. He was well skilled in 

 the science of music, the theory of 

 sounds, and the various scales both an- 

 cient and modern ; but he was a very 

 poor performer, though he could make 

 and repair some instruments, and some- 

 times went about the country tuning 

 harpsichords. 



The following is the list of Mr. Emer- 

 son's works, all of them printed in bvo., 

 excepting his " Mechanics" and his tk In- 

 crements," in 4to. and his " Navigation" 

 in 12mo. 1. The Doctrine of Fiuxions. 



2. The Projection of the Sphere, Ortho- 

 graphic, Stereographic, and Gnomonical. 



3. The Elements of Trigonometry. 4. The 

 Principles of Mechanics. 5. A Treatise 

 of Navigation on the Sea. 6. A Treatise 

 on Arithmetic. 7. A Treatise on Geom- 

 etry. 8. A Treatise of Algebra in two 

 books. 9. The Method of Increments. 



10. Arithmetic of Infinities, and the 

 Conic Sections, with other Curve Lines. 



11. Elements of Optics and Perspective. 

 V2. Astronomy. 13. Mechanics, with 

 Centripetal and Centrifugal Forces. 14. 

 Mechanical Principles of Geography, 

 Navigation, and Dialling. 15. Commen- 



tary on the Principia, with the Defence 

 of Newton. 16. Tracts. 17. Miscella- 

 nies. 



EMERY, a stone of the ruby family, of 

 which three kinds are usually distinguish- 

 ed in commerce ; the Spanish, red, and 

 common emery. The first sort is found 

 in the gold mines of Peru, and, be;ng 

 judged a kind of rnarcasite of that rich 

 metai, is prohibited to be exported. The 

 red emery is found in copper mines, and 

 the little there is of i in England comes 

 from Sweden and Denmark. The com- 

 mon emery is taken out of iron m.nes, 

 and almost the only sort used in Eng- 

 land ; it is of a brownish colour, border- 

 ing a little on red, exceedingly hard, and 

 in consequence difficult to pulverize. 

 The English are the only people who 

 have the art oi reducing common emery 

 into powder, and thus send it to their 

 neighbours. Of the powder, the most 

 subtile and impalpable is the best : as 

 to the stone, it should be chosen of a 

 high colour, and as free ot the rock as 

 possible. 



The consumption of emery is very con- 

 siderable among the armourers, cutlers, 

 lock-smiths, lapidaries, masons, and otuer 

 mechanics; some of whom use it to po- 

 lish and burnish iron and steel works ; 

 others to cut and scollop glass, marble, 

 and precious stones. 



EMETIC, a medicine which induces 

 vomiting. 



EMETIC tartar, the old name for tar- 

 trite of antimony. 



EMOLLIENTS. See PHARMACY. 



EMPETRUM, in botany, heath, a ge- 

 nus ot the Dioecia Triandria class and 

 order. Natural order of Ericae, Jussieu. 

 Essential character : male, calyx three- 

 parted; corolla three-petalled; stamens 

 long ; female, calyx three-parted; coroila 

 three-petalled ; styles nine ; berry nine- 

 seeded. There are two species, viz. E. 

 album, white-berried heath, and .E. ni- 

 grum, black-berried heath, crow or crake 

 berry. These are low shrubs, seldom 

 propagated in gardens, unless tor varie- 

 ty's sake. They are natives of wild 

 mountains, where the soil is heathy and 

 full of bogs. 



EMPIS, in natural history, a genus of 

 insects of the order Diptera. Generic 

 character: mouth with an inflected si, ck- 

 er and proboscis ; sucker with a s;ngie- 

 vaived sheath and three bristles ; feelers 

 short, filiform; antennae setaceous. These 

 minute insects live by sucking out the 

 blood and juices of other animals There 

 are about thirty species. One of the 



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