Examples from the Web for half-plate
He drew from the portfolio a half-plate photograph of the thumb-print which appeared magnified to about four inches in length.The Red Thumb Mark|R. Austin Freeman
At the back was a large unframed photograph of the size known as half-plate of the interior of some building.The Ragged Trousered Philanthropists|Robert Tressell
In full plate watches it is circular; in three-quarter plate or half-plate watches a part is cut away.
To-day, in Rome, it is easier to get a half-plate of fresh mushrooms from Noricum than to find such.Quo Vadis|Henryk Sienkiewicz
In half-plate, and three-quarter-plate types of watches part of the disc is cut away.