Examples from the Web for quarter plate
Provision is then made to fit into the frame a quarter-plate printing frame, in which is placed the negative.
He extracted the camera—a quarter-plate instrument—from its case and opened it.The Red Thumb Mark|R. Austin Freeman
The time taken to transmit a photograph, quarter-plate size, is about fifteen minutes.Wireless Transmission of Photographs|Marcus J. Martin
The quarter-plate size will be found most suitable, and these may be successfully enlarged to 12 by 10.