COPPER RIDGE can be installed with nails or cleats.
The nails would typically be
2.5" 10 ga. copper roofing nails, spaced between each pair of underlying slates (approximately 12" apart, but nailed *between* the underlying slates, which will determine spacing). The nail heads will then need to be sealed with a sealant such as GE Silicon II clear caulk.
Alternatively, the ridge can be installed with cleats, which will allow an installation with no exposed fasteners. The cleats can simply be folded over the edges of the ridge as shown below on an old courthouse in eastern Pennsylvania, or they can be folded and riveted (recommended) with
copper/brass pop rivets, or they can be folded, riveted *and* soldered, as shown at Yale University below. Here are some photos of cleats on ridges:

