FINAL ACT OF SECOND PAN AMERICAN SCIENTIFIC CONGRESS. 235 



Sanitary Engineering in Ecuador. 

 FRANCISCO MANRIQUE. 



Sanitary Engineering in Bogota. 



CARLOS DE NARVAEZ, Q., Bogota, Colombia. (Read by EDWARD 

 BARTOW.) 



Joint Session of Subsections 5 and 6. 



RALEIGH HOTEL, FIRST FLOOR, PRIVATE DINING ROOM. 



CARL C. THOMAS, Chairman. 



New Property of Involution of Polygons Circumscribed and Inscribed to 



Conic Sections. 

 JOSE; ISAAC DEL CORRAL. 



Method of Diagonal Notation, etc. 



RODOLFO AGUILAR BATRES, Topographical Engineer, Guatemala. 



The Gyroscope Applied to Aerial and Water Navigation. (With lantern 



slides and moving pictures.) 



ELMER A. SPERRY, Sperry Gyroscope Company, Manhattan Bridge 

 Plaza, Brooklyn, N. Y. 



Chronocyclograph Motion Devices for Measuring Achievement. (With 



lantern slides.) 

 FRANK B. GILBRETH, 77 Brown Street, Providence, R. I. 



MONDAY AFTERNOON, JANUARY 3, 19162.30 O'CLOCK. 

 Session of Subsections 1 and 2. 



NEW WILLARD HOTEL, TENTH FLOOR, SMALL BALLROOM. 



Joint Session of Subsections 1 and 2, Section V, with Subsection 1 of Section IX (Transportation) in Section 

 IX Rooms at the New Willard Hotel. 



Brig. Gen. W. H. BIXBY, JOHN H. BRASHEAR, and ALEXANDER GRAHAM 



BELL, Chairmen. 

 Merchant Marine. 



LEWIS NIXON, 22 East Thirty-third Street, New York, N. Y. 



Shallow-draft Boat and Barge Transportation. 



Col. L. H. BEACH, Corps of Engineers, United States Army, Cin- 

 cinnati, Ohio, in collaboration with 



Lieut. Col. CHARLES KELLER, Corps of Engineers, United States 

 Army, Mobile, Ala. 



