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 OI THE SOCIBTY :
W i l l i a m A. H a n l b y , President
W. D. E n n i s , Treasurer C. E . D a v i e s , Secretary
COMMITTBB ON PUBLICATIONS:
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 , Jr.
C. R. SoDERBERG E. J. K a TES
G e o r g e A. S t e t s o n , Editor
ADVISORY MEMBERS OF THE COMMITTEE ON PUBLICATIONS:
W. L. D u d l e y , S e a t t l e , W a s h . N. C. E b a d g h , G a i n e s v i l l b , F l a . O. B. S c h i b r , 2 n d , New 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 r a n k l i n H . F o w l e r , J r . , C a l d w e l l , N . J .
P u blished m onthly by T h e A m erican Society of M echanical Engineers. Publication office at 20th and N ortham pton Streets, Easton, Pa. T h e editorial
dep artm en t located at th e headquarters o f the Society, 29 W est T hirty-N inth Street, N ew Y ork, N . Y. Cable address, "D ynam ic,” N ew 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. C hanges o f address m ust be received at Society headquarters tw o w eeks before
they are to be effective on the m ailing list. Please send o ld as w ell as new address___By-Law: T h e Society shall not be responsible for statem ents o r opinions
advanced in papers o r . . . . printed in its publications (B 13, Par. 4) .... Entered as second-class m atter M arch 2, 1928, at th e Post Office at Easton, Pa.,
under the Act o f A ugust 24, 1912. . . . C opyrighted, 1941, by The A m erican Society of M echanical Engineers.