I.  43.  JANUARY  1872.  No.  283 
Published  the  First  Day  of  every  Month. — Price  2s.  6d. 
THE 
LONDON,  EDINBURGH,  and  DUBLIN 
PHILOSOPHICAL     MAGAZINE, 
AND 
I  JOURNAL  OF  SCIENCE. 
Being   a    Continuation   of  Tilloch's    'Philosophical   Magazine' 
Nicholson's  'Journal?  and  Thomson's  '  Annals  of  Philosophy.3 
CONDUCTED  BY 
SIR  ROBERT  KANE,  LL.D.  F.R.S.  M.R.I.A.  F.C.S. 
SIR  WILLIAM  THOMSON,  Knt.  LL.D.  F.R.S.  &c. 
AND 
WILLIAM  FRANCIS,  Ph.D.  F.L.S.  F.R.A.S.  F.C.S. 
FOURTH    SERIES. 
N°  283.— JANUARY  1872. 
WITH  A  PLATE, 
Illustrative  of  Mr.  J.  E.  H.  Gordon's  Description  of  a  new  Anemometer 
for  Indicating  and  Registering  the  Force  and  Direction  of  the  Wind  at 
any  distance  from  the  Vane,  &c. 
LONDON: 
PBINTED  BY  TAYLOR  AND  FRANCIS,  RED  LION  COURT,  FLEET  STREET, 
Printers  and  Publishers  to  the  University  of  London. 
Sold  by  Longmans,  Green,  Header  and  Dyer ;  Kent  and  Co. ;  Simpkin,  Marshall  and 
Co. ;  Whittaker  and  Co. ;  and  H.  Bailliere,  London :— and  by  A.  and  C.  Black,  and 
Thomas  Clark,  Edinburgh;  Smith  and  Son,  Glasgow.— Hodges  and  Smith, 
Dublin  : — Putnam,  Jsew  York : — and  Asher  and  Co.,  Berlin. 
