| 摘要 |
A whiteboard 10 has a front face for display of an image from a projector 40 mounted on a boom 30. The whiteboard is mounted to a trolley at a predetermined height by applying fasteners through brackets 16,17,18. The boom for the projector is mounted to the rear of the whiteboard to a forkhead 32 so as to pivot in a vertical plane so that it can take up in use one of several positions projecting at an upward inclination to the front of the whiteboard. The boom is also mounted on a rotatable shaft 34 so as to pivot about a vertical axis so that it can be swung sideways and then down to an inoperative position close to and behind the whiteboard. In this configuration the trolley can wheeled through any number of standard height doorways to a classroom where it is to be used. |
