### device | instrument:

Atomic clock
* are also immune to the earth's slowing rotation
  - important to a variety of scientific endeavors
  - clocks
* are currently our most precise timekeepers
  - the most exact clocks of the world
  - quite complex, but the basic theory is simple
  - slightly too accurate
* based on the cesium atom are the primary means for accurate timekeeping.
* can maintain accuracy because they're based on the atomic properties of substances
  - theoretically keep accurate time for millions of years
* keep time by precisely counting the vibrations of atoms.
* measure time to an accuracy of ten billionths of a second per day.
* use the frequency of electronic transitions in certain atoms to measure the second.
* work by monitoring the natural vibrational frequency of atoms and are very accurate.
  * An 'atomic clock' is an exact clock that works with atoms, as opposed to most other clocks which are mechanical. The frequency comes from the crossing radiation of electrons. Atomic clocks are currently the most exact clocks of the world. They are also called 'primary clocks'.

Authorization
* is an instrument
  - communicating
  - management
* is part of access control
  - budgetings
  - the process of identifying what a user can do

Binoculars
* includes eyepieces
  - sections
* increase chances.

Bolometer
* are sensors that absorb radiation detected from objects
  - the most sensitive detectors for broadband low-background radiation
* convert absorbed incident radiation to current to provide high-sensitivity detection
  - heat to an electronic signal

Brief
* are bands
  - legal documents
  - outlines
  - pants
* is an instrument

### device | instrument | brief:

Boxer brief
* Some boxer briefs have an opening with buttons on the front
  - elastic at the end of the legs, and stitching across the bottom
+ Boxer briefs: underwear
  * Boxer briefs are usually made of soft material, and can be made in different colours. Some boxer briefs have an opening with buttons on the front. Others just have an elastic waistband and can be pulled on or off like briefs. The waistband is often a separate piece of elastic, and is sometimes in a color. Some boxer briefs have elastic at the end of the legs, and stitching across the bottom.

Bronchoscope
* are instruments used to examine the lung's airways.
* is an instrument

Colorimeter
* are devices used to measure the color values on a monitor or on printed material
  - laboratory equipment
* have a strong light inside the machine.
* read in numerical values.

### device | instrument:

Compass
* Many compasses have a fixed declination correction scale to simplify the calculations required.
* Most compasses are able to correct for magnetic declination.
* Most compasses have magnets
  - mechanisms
  - needle lift mechanisms
* Some compasses are more sensitive than others.
* Some compasses have a device to set magnetic north
  - capsules
  - rings
* always line up with the net magnetic field.
* are capability
  - essentially simple devices
* are located in backpacks
  - cabinets
  - mechanical devices
  - specific and pre-set for whichever hemisphere they are to be used in
  - used for navigation
* come in a variety of shapes and sizes depending on their intended use.
* includes sections.
* point to magnetic north, rather than true north
  - north because geographic north is polar south
  - the North Magnetic Pole
* reveal the direction of the local magnetic field.
* vary considerably in price and design.
* work because the earth acts like a giant bar magnet.

### device | instrument | compass:

Conventional compass
* align themselves with the Earth's magnetic field at a given location.
* can no longer function because of the strong magnetic force.