### equipment | apparatus:

Photocopier
* Some photocopiers use a of radioactive material to eliminate the static charge in sheets of paper.
* accept coins, bills, and debit cards.
* are a major source of ozone contamination indoors
  - duplicators
  - electronic devices
  - expensive, as are computers and video cameras
* are located in libraries
  - offices
* can be a powerful source of light.
* emit low levels of air-polluting chemicals.
* have a lot in common with laser printers.
* includes sections.
* try to reproduce something, but they can t.

Purifier
* are apparatus.
* can also kill bacteria.
* is apparatus
* use blasts of air to separate out bran from the other particles.

Reformer
* Some reformers prefer to retain taxes in order to take from the rich and give to the poor.
  - disputants
  - part of oil refineries
* processing natural gas, for example, tend to produce carbon dioxide.

### equipment | apparatus:

Semaphore
* act as primitive objects which perform synchronizations of several sorts.
* are a concept to synchronize parallel task
  - quite old approach to synchronize parallel tasks
  - an operating system facility used to control waiting
  - cool
  - extremely efficient however, and are widely used
  - locks
  - names of shared resources that the server keeps track of
  - perfect for letting threads keep track of each other
  - simple and elegant and allow the solution of many interesting problems
  - simpler and faster
  - useful in limiting the number of threads a resource dispenser creates
* belong to the allocating process.
* can also solve the starvation problem.
* have their dangers
  - three properties
* provide a means for one task to jog another
  - method of blocked waiting
  - solution to the mutual exclusion problem
  - an efficient and general purpose mechanism for protecting critical regions
* solve the problem of lost wakeup calls.
* take a nonnegative integer value.

Separator
* also treat stormwater before discharge to storm drains.
* are either vertical or horizontal and either cylindrical or spherical in shape.
* remove heavy liquid loads and are effective on larger water droplets.

Spindle apparatus
* attaches tho chromosomes.
* is made of microtubules.

Submersible
* allow scientists to dive to the ocean floor but are much more costly than ROVs.
  - usually smaller than submarines
  - warships
* can only cover very short distances underwater and can only dive to certain depths.

### equipment:

Artificial satellite
* are located in space shuttles
  - man-made, such as weather satellites
  - smaller, unmanned spacecraft
  - too small to develop substantial tidal stresses
* can also be very bright depending on how much sunlight they reflect.
* is equipment
* orbit the earth at altitudes between one hundred and several thousand miles.
* serve multiple purposes nowadays.
* stay in space for varying lengths of time.
+ Spacecraft, Satellites
  * Some of the most important spacecraft today are artificial satellites. Artificial satellites are smaller, unmanned spacecraft. Some go into Low Earth orbit to look at the Earth or for other purposes. Others are sent to geostationary orbit to relay radio signals from one part of Earth to another, or to watch events on Earth from a high point of view. Communications satellites are important for television and other communications, and other satellites help with weather prediction and other jobs.