        They hit the wall fairly quickly.  Octavia finally went out and got dinner, while Twilight struggled to understand the drawings of transparent globes.  There was a bulb-shaped one which had a coiled filament drawn on two supporting posts, as well as a similar short cylindrical device.  Each of the two had a threaded base.  There was also a drawing of a long white tube, which was cut away to show what went inside.  However, since she was unable to read the text, she could come to no conclusions.