196 



PHILOSOPHICAL TRANSACTIONS. 



[anno 1738. 



taining stones or leaden weights, as much as will be found necessary to sink, 

 them readily, when they are lowered down into the water. 



Lastly, If we consider the charge of those bellows used at iron furnaces, as 

 to the bellows themselves, the water-wheel, and its axle-tree, &c. and compare 

 the same with the cost of these, we shall easily find a vast difference, not to 

 mention the great charges of keeping the common bellows in repair. Before 

 concluding it may be mentioned, that the blast of these bellows is governed 

 and moderated in the same manner as the common ones, viz. by letting more 

 or less water into the sloping gutters, and by taking out and letting in plugs for 

 that purpose, placed in holes near the top of the water-bellows. 



An Abstract of Meteorological Observations for 6 Years, made at Padua. By 

 Sig. Poleni. N" 448, p. 239- Translated from the Latin. 



The following is an abstract of 6 years meteorological observations, made ac- 

 cording to the rules recommended by Dr. Jurin ; and consequently correspond- 

 ing with those published in Phil. Trans. N° 421. The instruments used were 

 the same, and posited in the same places, and applied in the same manner, as 

 there mentioned. The observations are as follow : 



Table a, showing the Rain and Snow -Water for every Month. 



Sum of the whole year . . 34,207. . 35.456. . 32,137. . 38.563, . 29.685. . 30.633 



By which all the varieties, as to different years and seasons, easily appears 

 And the medium annual quantity, among all these 6 years, is 33.447. 



i 



