THE EOYAL ARTILLERY INSTITUTION. 
3 
The following is the form of table recommended for use in Batteries : 
Station. 
Name of Battery . 
Height above Low water... 
Angle of Depression. 
Eange 
at 
Low Water. 
Eange 
at 
Mean Tide. 
Eange 
at 
High Tide. 
The calculation of these tables requires merely a knowledge of common 
multiplication; any master gunner, or non-commissioned officer might make 
them out, and as it is not likely that ranges would be required beyond three 
miles, or within five hundred yards, merely ninety lines of ranges would be 
required if every angle were given; but as 1' of a degree would only cause a 
difference in the range of about 5 yds. when the angle was greater than 2° 
and the battery 100 ft. high, every W might be there calculated and the 
proportion allowed for by estimation. Thus the Table would scarcely 
exceed 50 lines, and its practical use would be well worth the trouble. 
