Solar chargers employ solar
energy to supply electricity
to devices or charge
batteries, and are generally
portable. Small portable
models designed to charge a
range of different mobile
phones, cell phones, iPods or
other portable audio
equipment. A wind up radio or
clockwork radio is a radio
that is powered by human
muscle power rather than
batteries or the electrical
grid. Wind up radios is
intended for camping,
emergencies and for areas
where there is no electrical
grid and replacement batteries
are hard to obtain, such as in
developing countries and
remote settlements. They are
also useful where radio is not
used on a regular basis and
batteries would deteriorate,
such as a vacation home or
cabin. An axe is a tool used
for chopping or splitting
objects, such as tree limbs or
logs. A hatchet is appropriate
for cutting dead branches,
twigs, firewood and can be
operated with one hand. A wire
saw is a method using a metal
or cable for cutting.
