This last picture is of a 1912 Brunswick Regina 5'×10' billiards table slate, using only 4 slate screws to mount it.
The first picture is showing a few of 5 pieces of slate for it, no slate screws were used at all to mount those slates.
The first picture is showing a few of 5 pieces of slate for it, no slate screws were used at all to mount those slates.