key-plate

This done, we next take the frame and remove the key-plate from it.

Scientific American Supplement, No. 561, October 2, 1886 Various

The design on the stone is then rolled in with black printing ink and etched, thus enabling the lithographer to take the necessary ten impressions of the key-plate.

The Building of a Book A Series of Practical Articles Written by Experts in the Various Departments of Book Making and Distributing Various

In this case fifteen impressions are made from the key-plate as well as from each of the color-plates, on the paper, and with the ink described above.

The Building of a Book A Series of Practical Articles Written by Experts in the Various Departments of Book Making and Distributing Various

The first transfer to be made is that of the key-plate.

The Building of a Book A Series of Practical Articles Written by Experts in the Various Departments of Book Making and Distributing Various

The first step is the making of the so-called key-plate.

The Building of a Book A Series of Practical Articles Written by Experts in the Various Departments of Book Making and Distributing Various

There are no scratches on the ornamental key-plate, indicating that any sharp instruments have been inserted.

The Case of the Sleepwalker's Niece Gardner, Erle Stanley, 1889-1970 1936