### device | instrument:

Rangefinder
* are like binoculars.
* focusing system which measures the distance from camera to subject.

Refractometer
* are well suited for determining the density of syrup at room temperature.
* is an instrument
* measure the change in the direction of light as it passes from air into water.
* use a scale to quantify the effect that dissolved solids in water have on light.

Scientific instrument
* Most scientific instruments are often of vital everyday importance.
* are objects used in science.
+ Instrument
  * Scientific instruments are objects used in science. An example would be the test tubes, a telescope or a Bunsen burner.

### device | instrument | scientific instrument:

Cyclotron
* accelerate charged particles as they orbit in circles in a magnetic field.
* are accelerators.
* belong to a class of machines called particle accelerators.
* go in spirals, and are a much more efficient method of accelerating particles.
* scientific instrument

### device | instrument | scientific instrument | cyclotron:

Synchrotron
* are cyclotrons
  - large electron accelerators
  - sources of light with an extraordinary brilliance, ranging from infrared to X-rays
* are the highest power sources of X-rays available in the world today
  - X-rays in the world
* produce the highest flux sources available.

Linear accelerator
* Some linear accelerators produce beams
  - electron beams
* are accelerators
  - ones that are just a straight tube
  - the most common type of equipment used to deliver external beam treatments
* produce x-rays at various energies.

Microtome
* are often fine pieces of mechanism.
* have a mechanism for advancing the block across the knife.

Particle accelerator
* Some particle accelerators produce beams.
* accommodate very few experimental groups at any one time.
* play an integral role in the advancement of cancer therapy.
* work by moving charged particles in an electromagnetic field.

Strobe
* All strobes have a flash tube and a capacitor.
* are the easiest and produce the most natural colors.
* can have much faster effective shutter speed.
* enhance the dizziness and chaos.
* have negligible propagation delay.
* scientific instrument
* typically use rechargeable nicad batteries.

Strobe light
* causes epileptic seizures.
* contain no moving parts.
* is lamps.

Stroboscope
* are commonly available for setting the ignition timing of motor vehicle engines.
* give flashes of bright light.
* produce a brilliant flash of light that is extremely brief.

Sonar
* Some sonars use standard D-cell batteries, some use small gel cells.
* are part of submarines.
* can transmit a narrow beam of sound into the ocean in a short pulse.
* includes sections.
* is an instrument
* measuring device.
* works by inhibiting carotenoid synthesis in the target plant.

Stethoscope
* are an instrument to listen to our hearts
  - cold
  - devices
  - located in doctors
  - medical devices
  - tools
* carry disease from one patient to the other.

Stringed instrument
* are located in bands
  - concerts
  - music stores
  - rock bands
  - string quartets
  - musical instruments
* are used for fun
  - orchestras

### device | instrument:

Sundial
* are among humanity's most ancient and enduring inventions
  - beautiful and enduring, and one of the most important historic factors of time
  - literally as old as time
* are the earliest methods of telling time
  - oldest known instrument for telling time
* come in many shapes, sizes and styles.
* employ many types of gnomon.
* indicate apparent solar time, while clocks are regulated to indicate mean solar time
  - the local solar time , unless corrected for some other time
* measure time as it is.
* only measure local solar time.
* show the hours with the dagger that kills.
* tell what is called local apparent time.