There was a dramatic wall of vastnumbers of slips, or ‘zettel’, hanging from long nails.
The Grimmwelt Museum in Kassel, Germany is the home of some of the work of Grimm Brothers work on the Deutsches Wörterbuch which features a large wall of zettel or slips hanging from long nails.
The slips hanging on nails sounds similar to Thomas Harrison's 1740's wooden cabinet of hanging slips used for excerpts and isn't far off from the organizational structure used by the subsequent Oxford English Dictionary's pigeonhole system of organization for their slip collection.