### device | instrument | magnifier | telescope:

Dobsonian telescope
* are a well known design with a mount configured for easy viewing.
* offer big thin mirrors with stable, inexpensive altazimuth mounts.

Large telescope
* All large telescopes are reflectors.
* Most large telescopes produce diffraction.
* are also valuable for their ability to measure fine detail.
* can look at things way out in space
  - show some nebulosity
* show details.
* used for astronomy have sidereal drives.

Larger telescope
* allow observewrs to see fainter objects.
* can see the black dust band near the galaxy's center
  - spot a tiny dim star cluster nearby
* give brighter images.

Modern telescope
* are more like big cameras to record images in electronic storage devices.
* use mirrors instead of lens

Newtonian telescope
* Most Newtonian telescopes have openings at the focuser's base.
* uses flat mirror to reflect light from curved mirror into the eyepiece.

Powerful telescope
* More powerful telescopes allow scientists to see all the planets more clearly, including Uranus.
* can see far into space, making far away objects look closer and brighter.

Reflector telescope
* Most reflector telescopes have lenses.
* are cheaper to make than refractors of the same size
  - great for deep-sky objects
* use a concave mirror at the bottom of a tube to focus the light.

Robotic telescope
* can offer greater precision than human operated telescopes.
* sheds light on cosmic microwave background.

Space telescope
* Most space telescopes enable astronomers.
* are much more expensive to build than ground-based telescopes.

Mandamus
* is an order requiring an act to be carried out.
* proceeding to compel performance of a specified duty.
* remedial tool which mandates the performance of a nondiscretionary duty.

Mandate
* are commissions
  - districts
  - legal documents
  - magazines
  - norms
  - people required by law to report child and elderly abuse
* is an instrument

### device | instrument | measuring device:

Accelerometer
* Describe how accelerometers are used to sense aircraft attitude during flight.
* are gauges
  - products
  - transducers
* have a much higher resolution measuring fast movements than ultrasonics.
* includes sections.
* measuring device.

Altimeter
* are gauges.
* can be so sensitive they can even detect the height of buildings.
* determine a plane's altitude by measuring atmospheric pressure.

### device | instrument | measuring device | altimeter:

Hypsometer
* are instruments foresters use to measure tree heights.
* is an altimeter

### device | instrument | measuring device:

Barometer
* Most barometers measure air pressure
* Some barometers measure height
  - use long glass tubes filled with mercury inverted in a dish
* are instruments that measure atmospheric pressure as an indication of weather
  - to measure the pressure of the atmosphere
  - used to measure atmospheric pressure
  - pressure gauges
* are used to measure air pressure
  - predict the weather
* come in combination pieces with clocks and hygrometers.
* demonstrate the changes in air pressure over time.
* have German precision instrumentation.
* includes sections.
* measure atmospheric pressure using mercury , water or air
* serve several very important purposes.
* thus calculate the pressure exerted over a unit area by the column of air over that area.
* work on the same principle, of which the most common is called a mercury barometer.

### device | instrument | measuring device | barometer:

Mercury barometer
* Most mercury barometers measure pressure.
* consists of a glass tube and an open container of mercury.

Share price
* are a function of the overall perception of the market
  - another indicator of financial health
* can rise due to a variety of factors, of which earnings is only one.
* increase when a company grows.
* rise and fall based on the demand for a particular stock.