Years ago I purchased one of those electro-magnetic pseudo perpetual
motion machines. The instructions that came with it are really a gem.
I quote them verbatim:
INSTRUCTION HOW TO USE
- Firstly please swing widely by hand then continuously swinging.
- Battery doesn't exhaust in vain when it is still because electric
current can not be flowed.
- Dusts on surface of stand-base prevent the moving then result in stopping
- Don't place near to TV or Motor etc. to have magnetism which
prevents moving and makes battery exhaust in vain even when still.
- Battery change - please open the of back side like a picture Battery
to be used - 006 P (9V).
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My friend Bob got these instructions with his laser pointer:
Safety Rules
- Never aim a laser beam at a person's eyes.
- Using proper safety eyewear if there is a chance that the
beam or hazardous specular reflection will expose the eyes.
- Permitting only experienced personnel to operate the laser
and not leaving an operational laser unattended if there is a chance
that an unauthorized user may attept to use it.
- Assuring that any spectators are not potentially exposed
to a hazardous condition.
- Not permitting tracking of non-target vehicles or aircraft
if the laser is used outdoors.
- Assuring that individuals do not look directly into a laser
beam with optical instruments unless an adequate protective filter is
present within the optical train.
- Eliminating unnecessary specular (mirror-like) surfaces from the
vicinity of the laser beam path, or avoid aiming at such surfaces.
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