DRUM WICKETS AND BEAR-TRAPS. 



265 



being similar for the direct, or up-stream, folding gate, and for the reversed, or down- 

 stream, folding gate. 



TABLE OP PARKER-GATE PROPORTIONS. 



Lang Bear-trap. The following is a table of data for proportioning a bear-trap 

 of the Lang type, the letters and figure being the same as for the Parker gate.* 



TABLE OF LANG-GATE PROPORTIONS. 



* Transactions American Socety of Civil Engineers, June, 1898. Tables calculated by Mr. T. C. Thomas. 



