The American Society of Mechanical Engineers

Transactions
of The American Society of M echanical Engineers
Published on the tenth of every month, except March, June, September, and December
OFFICERS OF THE SOCIETY:
W i l l i a m A. H a n l e y , President
W. D. E n n i s , Treasurer C. E. D a v i e s , Secretary
C O M M IT T E E ON P U B L IC A T IO N S :
C. B . P e c k , Chairman
F. L. B r a d l e y . A. R. S t e v e n s o n , J r 4
C. R. SoDERBERG E. J. K a TES
G e o r g e A. S t e t s o n , Editor
ADV ISORY M EM BERS OF THE C O M M IT T E E ON P U B L IC A T IO N S :
W. L. D u d l e y , S e a t t l e , W a s h . N . C. E b a u g h , G a i n e s v i l l e , F l a . O. B. S c h i e r , 2 n d , N e w Y o r k , N. Y.
Junior Members
C . C . K i r b y , N e w Y o r k , N. Y . F . H. F o w l e r , J r . , C a l d w e l l , N. J.
Published m onthly by T h e A m erican Society o f M echanical Engineers. P ublication office at 20th and N ortham pton Streets, Easton, Pa. T he editorial
departm ent located at the headquarters o f the Society, 29 W est T hirty-N inth Street, N ew Y ork, N. Y. Cable address, “Dynam ic,” New Y ork. Price $ 1.50
a copy, $12.00 a year; to m em bers and affiliates, $1.00 a copy, $7.50 a year. Changes o f address m ust be received at Society headquarters tw o weeks before
they are to be effective on the m ailing list. Please send old as w ell as new address___ By-Law: T h e Society shall not be responsible for statem ents o r o p in ­
io n s advanced in papers o r . . . . p rinted in its publications (B13, Par. 4 ) . . . . E ntered as second-class m atter M arch 2, 1928, at the Post Office at Easton, Pa.,
u n d er the Act of August 24, 1912. . . . C opyrighted, 1941, by T h e A m erican Society o f M echanical Engineers.