Standard Copper Wave-Lengths in the Region 100A to 450A

The copper spectrum has been photographed in the region 100A to 450A with a twenty-one foot grazing incidence vacuum spectrograph. The wave-length of sharp copper lines (approximately two every Angstrom) have been determined by interpolating between known aluminum and oxygen lines with the formula $\lambda ={\lambda }_0+Ax+B{x}^2+C{x}^3\cdots$. A discussion of the errors in the wave-lengths is given.