What made up the puzzle board on Wheel of Fortune before being updated to touch-sensitive letter displays?

Answer 1

The following Puzzle Board information is quoted from the related link:

"In the show's early days, the first puzzle board had three rows of 13 manually operated trilons, for a total of 39 spaces. On December 21, 1981, a larger board with 48 trilons in four rows (11, 13, 13 and 11 trilons) was adopted. This board was surrounded by a double-arched border of lights which flashed at the beginning and end of the round. When a letter was placed in the puzzle, its space lit up and the hostess turned the trilon to reveal it.

On February 24, 1997, the show introduced a computerized board composed of 52 touch-activated monitors. To illuminate a letter during regular gameplay, White touches the right edge of the monitor."