mek6800d2

   "The DTR is mounted on the spacecraft such that its angular momentum is introduced into the yaw and pitch axes of the spacecraft with almost none going into the roll axis. DSSCAN was first programmed to introduce cancelling momentum in the yaw axis only. The modification to the AACS and CCS software took place in an environment of a scarcity of available memory so that, from a programming point of view, it had to be carefully fit in. The "patch" was carefully tested in the Voyager Capability Demonstration Laboratory (CDL) before loading onboard Voyager 1. (The AACS and CCS programs were modified without being reassembled as is the case with all AACS and CCS changes since launch.) The CDL is a digital/analog simulation of many of the spacecraft capabilities. Modifications or tests of any degree of complexity are done first, whenever possible, on Voyager 1 before implementation on Voyager 2, a reflection of the fact that Voyager 2 still has two planetary encounters scheduled while Voyager 1 has none."

   Few people realize, however, that when a used toilet is flushed, a turbulence and spray of water and excrement is generated comparable to a sneeze: in any toilet one can isolate faecal clostridia and streptococci from the ceiling, walls and door handle as well as around and beneath the seat.  British water closets certainly generate such infectious aerosols; it is probable that the vortex type favoured in the USA, depending on a swirl rather than a splash to flush the closet, is less generous in the matter of dispersing faecal microbes around the room.