Numb. 448- 
PHILOSOPHICAL 
TRANSACTIONS 
For the Months of June and July , 1738. 
The CONTENTS. 
I. A ’Defer iption of a new Invention 0/’ Bellows, 
called W ater-Bellows, by Martin Triewald, F. R. $. 
Captain of Mechanics, and Military Ar chit ell to 
his Swedifh Majefiy 5 communicated to the Royal 
Society by Sir Hans Sloane, Bart. Brefi R. S. &c. 
II. Viri celeberrimi Johannis Marchionis Poleni, R. Si 
Lond. S. ad Virum DoCtiJfimum 
M. D. R. S. S. Epiftola, qua continetur Summa- 
rium Obfervationum Meteorologicarum per fexen - 
Patavii habit arum. Ann. 1731* — 1736. 
III. The Imperfections of the common Barometers, 
and the Improvement made in them, by Mr. Cha. 
Orme of Afhby-de-la-Zouche in Leicefterlhire, 
where they are perfected and rectified s with fome 
Obfervations, Remarks and Rules for their Ufe y . 
by Hen. Beighton, F. R. S. 
IV, Re~ 
