摘要:
A capsule (100) comprising upper (101) and lower (102) parts each having a dished formation (105, 106) and a peripheral rim, the rims being secured together so that the formations (105, 106) are at least partially in register with one another to provide at least one vented chamber (100a), means in at least one of the parts (101, 102) to communicate between the interior of the chamber (100a) and the exterior thereof and the lower part (102) having its exterior so formed as to enable it to be held in stable engagement with a surface but so that a fluid may pass freely between those parts (101, 102) of the exterior of the lower part (102) and the surface that are not in intimate engagement.
摘要:
A capsule (100) comprising upper (101) and lower (102) parts each having a dished formation (105, 106) and a peripheral rim, the rims being secured together so that the formations (105, 106) are at least partially in register with one another to provide at least one vented chamber (100a), means in at least one of the parts (101, 102) to communicate between the interior of the chamber (100a) and the exterior thereof and the lower part (102) having its exterior so formed as to enable it to be held in stable engagement with a surface but so that a fluid may pass freely between those parts (101, 102) of the exterior of the lower part (102) and the surface that are not in intimate engagement.