Grating
FIG. 1 is a top plan view of a grating showing my new design; 
     FIG. 2 is a fragmentary view on an enlarged scale of one end of the grating of FIG. 1, showing the details thereof; 
     FIG. 3 is an end elevation view of the grating in FIG. 2; 
     FIG. 4 is a fragmentary plan view like FIG. 2, depicting another form of the invention; 
     FIG. 5 is a fragmentary plan view like FIG. 2, depicting another form of the invention; and 
     FIG. 6 is a fragmentary plan view like FIG. 2, depicting another form of the invention.