172 
MINUTES OF PROCEEDINGS OF 
Eigs. 3 and 4 give the details of the screens. Eig-. 8 represents a piece of 
board 1 inch thick and 6 or 7 inches wide, and rather longer than the width 
of the screen to be formed. Transverse grooves are cut at equal distances, 
something less than the diameter of the shot, as shewn in the diagram. 
Staples of hard brass spring-wire (No. 14 or 15), are fixed with their prongs 
in the continuation of the grooves. Pieces of sheet copper A are provided, 
having two elliptical holes, the distance of whose centres equals the distance 
of the grooves. The pieces of copper A are used to connect each wire steeple, 
as Cj with its neighbour on each side. Thus, Eig. 4, a , c , e } g> &c., represent 
these copper connections put in their places and holding down the wire 
spring, which, when free, are in contact with the tops of the holes; but, 
when properly weighted, they rest on the lower edge of the holes. Thus the 
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