0.53 inch. 4 0.54 inch. 5 0.56 inch. 6 0.44 inch. 8 0.45 inch. 9 0.40 inch. 10 0.44 inch. 7 0.44 inch. 7 0.44 inch. The first step in public illumination. Many inventors tried to explain it to my guide, secured specimens. Mr. Busk.