| 摘要 |
A picture viewer having a housing to contain a pile of pictures, a slide in the housing, a window in the housing, a pressure plate confronting the window, springs mounting the plate, in certain embodiments biased to press the plate toward the window, and in other embodiments biased to retain the plate away from the window, a control to alternately move the plate against the spring bias or release the plate to alternately apply and relieve pressure on the pile of pictures, the control operating in response to withdrawal and return of the slider and also being manually operable. |
