Set the fence of the table saw 1/4" from the blade. Place the long side of the board firmly against the fence (and flat on the table) and run the board through the saw until you reach the stop line. Next, carefully retract the board until it safely clears the blade.
With the stock and your hands clear of the blade, move the fence an additional 3/8" away from the blade and make another cut, parallel to the first and again up to the stop line. To be safe, the saw should always be turned off while adjusting the fence.
Repeat the previous step until the entire width of the board is cut into fingers. The finished featherboard should look like the example below.


