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MISCELLANEOUS PAPERS. 



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To the American Philosophical Society. 6v. 



Defcription of a MACHINE for cutting FILES, a Mo 



of ivbich was prefcnted the Society fame Time ajro. ^ 



By B. O. 



REFERENCES. 



BENCH, made of well leafoned oak, and the face 

 of it plained very fmooth. AAAA. (PI. VII. Fig. 2.) 

 BBBBB, The feet to the bench v/hich fliould be fub 



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ftantial. 



CCCC, The carnage on which the files are laid, which 

 moves along the face of the bench J AAA, parallel to iti> 

 fides, and carries the files gradually under the edge of tlie 

 chifel HII, while the teeth are cut: This carriage is made 

 'to move by a contrivance fomewhat fimilar to that which 

 carries the log againft the faw of a faw mill, as will be 

 more particularly defcribed. 



DDD^ Are three iron rods, inverted into the ends of the 

 carriage, CCCQ and which paffes through holes in the 

 fluds EEEy that are fcrewed firmly againft the ends of 

 the bench AAAAy for direding the courfe of the carriage 

 CCCC, parallel to the fides of the faid bench. 



FF^ Two upright pillars, mortifed firmly into the bench 

 AAAA, nearly equi-diftant from each end thereof, near 



the edge, and direaiy oppofite to each other. . 



GGy The lever or arm, which carries the cutter BII, 

 and works on the centers of two fcrews /C/f, which are 

 fixed into the two pillars IF, in a direction right acrofs 

 the bench AAAA. By tightening or loofening thefe fcrews, 

 the arm which carries the chifel, may be made to work 

 more or lefs fteady. 



L, Is the regulating fcrew, by means of which the files 

 may be made coarfcr or finer; this fcrew works in a flud 

 if, which is fcrewed firmly upon the top of the pillar F> 

 The lower end of the fcrew Z, bears againft the upper 

 part of the arm GC, and limits the height v/hicli it can rife, 



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