Tables of the Su7i's AUitude and Zenith Distances. 35 



Meteoric iron, hammered 7"965 



Iron, and 3 per cent, nickel . . . . . . 7*804 



Iron, and 10 per cent, nickel 7"849 



Steel, and 10 percent, platinum, (mirror) .. 8-100 



Steel, and 10 per cent, nickel, (mirror) .. 7 '684 

 Steel, and 1 per cent, gold, hammered . . 7*870 

 Steel, and 2 per cent, silver, hammered . . 7*808 

 Steel, and 15 per cent, platinum, hammered 7*732 

 Steel, and 1'5 per cent, rhodium, hammered 7*795 

 Steel, and 3 per cent, nickel, hammered . , 7*750 

 Platinum 50, and steel 50, unhammered* . . 9 862 



Platinum 90, and steel 20, unhammered f . . 15" 88 



Platinum, hammered and rolled 21*25 



{Quarterly Journal of Literature, &c.) 



• The calculated mean specific gravity of this alloy is 1 1-2723, assuming 

 a specific gravity of platinum and steel as expressed in this table, 

 t The calculated mean specific gravity of this alloy is 1 G-0766. 



VI. Tables oftlie Sun's Altitude and Zenith Distance, for every 

 Daii in the Year, tvhen it passes the Meridian, in Latitude 

 5\° 29' 8". By the Rev. Mr. L. Evans. 



To Mr. Tilloch. 



Sir, — As every auxiliary is useful to the amateur of practical 

 astronomy, I have thought the annexed Tables would not be an 

 unacceptable article, in your valuable publication, The Philoso- 

 phical Magazine, should you have the goodness t'-> insert it. They 

 were computed for the latitude of my Observatory, on Woolwich 

 Comnion, and are applicable to other latitudes not considerably 

 differing from it. 



I remain, sir, 



Your obliged humble servant, 



Woolwich Common, L. EvANS. 



July 19, 1820. 



The first column, in the Tables, contains the days of the month ; the second, 

 the eun'i meridian altitudes ; and the third, the sun's zenith distance*. 



E2 JANU- 



