| 摘要 |
<p>An electronic display system for automatically calculating and displaying information relevant to 'at risk' activities involving the use of breathing apparatus comprises a board (1) having a plurality of slots (6) each including a plurality of preprogrammed sensors (19a to 19e) and an associated display panel (8), and a plurality of tallies (10) each associated with one or more compressed air cylinders for location in the slots (6), each tally (10) including a pluratlity of actuating members (21a to 21e) the positions of which are adjustable in dependence upon the volume of, and the pressure within, the cylinders, the arrangement being such that, on insertion of a tally (10) into a slot (6) after location of the actuating members (21a to 21e) in accordance with the initial condition of the cylinders, said actuating members (21a to 21e) actuate corresponding sensors (19a to 19e) and the display panel (8) indicates the time available to a user of the cylinders.</p> |
