### device | instrument | measuring device | timepiece | clock:

Quartz clock
* gives accurate time.
* use the vibrations of a quartz crystal to power the clock.

Time clock
* Some time clocks allow control of temperature, lighting and ventilation systems.
* are a simple and inexpensive way to reduce space conditioning costs
  - located in work
* provide a simple and cost-effective way to control water heaters.

Wall clock
* are clocks.
* have either a swinging pendulum or a balance wheel to regulate time keeping.

Water glass
* has adhesive properties and is fire resistant.
* is actually sodium silicate, a powder that has no odor or taste
  - glass
  - very soluble in water, but the glassy solid dissolves slowly, even in boiling water

Timer
- folders that have a specific time associated with each
  - governors
* clock used to control processing.
* determine water flow based on line size, water pressure,and time.
* includes balance wheels
  - sections
* is an instrument
  - used to prevent damage of PCB and components
* precise judge of when poultry, meat or fish is done.
+ Atmel AVR, Features: Computers
  * Timer gives pulses in exact time. It is used for programing clock applications.

### device | instrument | measuring device | timepiece | timer:

Old timer
* are old men.
* remember when frequency was described in units of cycles per second.
* say the tree reacts by producing much more heartwood.

Modern instrument
* have even four strings.
* make it possible to monitor the baby's heart rate before delivery.
* use electronic means of recording the information.

Optical instrument
* Many optical instruments have more than one optical element.
* are instruments.
* map the intensity and colours of the aurora at various altitudes.
* measure concentration.

### device | instrument | optical instrument:

Mass spectrometer
* All mass spectrometers consist of three distinct regions
  - show a confounding effect of sample size on determined isotope ratio
* analyzes fine aerosols.
* are awe-inspiring specimens of technology
  - crucial for astronomical studies of our solar system
  - instruments that can measure small mass differences in molecules
  - spectroscopes
  - very successful at detecting trace molecules in the atmosphere
* is an optical instrument
* provide structural information to identify the analyte in a chromatographic peak.
* seem to indicate the accumulation of water-ice around the lunars poles.

Projector
* are located in conferences
  - meetings
  - movies
  - theatres
  - one of the fastest-growing hardware segments in the personal computer industry
* are optical devices
  - self-executable objects

### device | instrument | optical instrument | projector:

Overhead projector
* Most overhead projectors have a second lamp in case the first one blows.
* are electrical devices
  - players
* is used to project color of solutions.
* standard two-lamp overhead placed permanently in the room.

### device | instrument | optical instrument | projector | slide projector:

Magic lantern
* Some magic lanterns have mirrors.
* slide projector

Spectrograph
* All spectrographs experience mechanical flexure from thermal and other changes
  - have some minimal amount of flexure
* Many spectrographs provide a wide variety of wavelength regions and dispersions.
* Some spectrographs are difficult to use when the time and frequency are hard to decipher.
* are spectroscopes.