Oo 
though usually for much smaller polar intervals than with poor 
conductors. . 
oe of the texture was faithfully represented, the irregu- 
arities of the wires, breaks in the gauze, and the like, being ac- 
More interesting and varied results were obtained with a yo 
ting made of common writing paper by cutting out square @ 
i d the same distance apart. 
some a when nearer the latter. igteerginarae: 
ve jet and the center of the grating were in the line joining t 
Ww a 3 Sieiaiatiendliat ig teensttiselis about the ver- 
