One holey dollar was worth five shillings (a quarter of one pound sterling), and one dump was worth one shilling and three pence (or one quarter of a holey dollar).
The first type of circuit has a folded waveguide geometry in which anisotropic dielectrics and holey metamaterials are which consist of arrays of subwavelength holes (see image to the right).
By the time the holey dollar was finally demonetised in 1829, most of the 40,000 coins in circulation had been exchanged for legal tender and melted down into bullion.