Presents. [Jan. 26 r 



meters d and r as if they were x and y coordinates, and supposing at 

 each point of the " chart " thus resulting that the curve (A) is ex- 

 istent at that point. 



This method is capable of great extension; it is used in the pre- 

 sent paper in the heading (3), and has been found of great service 

 in dealing with other complex curves, as when the tracing point P 

 is not in the straight line AB. 



Watt gave a rule for " fixing" in the particular set of cases where 

 <p _r2 = J. A very simple practical rule for fixing has been found 

 for all values of d and r. 



The ' English Mechanic ' of December 29, 1882, published my first 

 attempts on this curve ; and the chart is there employed. 



The numerous writings of late years on Three-Bar Motion, by Mr. 

 Roberts, Professor Cayley, and others, do not appear to invade the 

 narrow area of the present paper, which especially aims at obtamicg^ 

 numbers for d and r of practical value. 



Presents, January 26, 1893. 



Transactions. 



Baltimore : Johns Hopkins University. Studies in Historical and 



Political Science. Series 10. Nos. 1011. 8vo. Baltimore 



1892. The University. 



Berlin : Deutsche Chemische Gesellschaft. Berichte. 1892. Nos. 



1116. 8vo. Berlin 1892. The Society. 



K. Akademie der Wissenschaften. Acta Borussica. Denkrnaler 



der Preussischen Staatsverwaltung im 18. Jahrhundert. 



Seidenindustrie. 3 vols. Large 8vo. Berlin 1892. 



The Academy, 



Gesellschaft fur Erdkunde. Die Entdeckung Amerika's in 

 ihrer Bedeutung fiir die Geschichte des Weltbildes. Von K. 

 Kretschmer. Festschrift der Gesellschaft fiir Erdkunde zu 

 Berlin. 4to. Berlin 1892. With accompanying Atlas in Folio. 



The Society. 



Brussels : Academie Royal e de Medecine de Belgique. Bulletin. 

 Se>. 4. Tome VI. Nos. 4 10. 8vo. Bruxelles 1892. 



The Academy. 



Academie Royale des Sciences. Bulletin. Ser.3. Tome XXIII. 

 Nos. 311. Tome XXIV. Nos. 711. 8vo. Bruxelles 

 1892 ; Annuaire. 1893. 12mo. Bruxelles 1892. 



The Academy. 



Bucharest : Societa^ii de Sciin^e Fizice. Buletinul. Anul 1. 

 No. 910. 8vo. Bucuresci 1892. The Society. 



