# ANALYTICAL ULTRACENTRIFUGE

An ultracentrifuge that uses one of three optical systems (schlieren, Rayleigh, or absorption) for the accurate determination of sedimentation velocity or equilibrium.

## Related Terms

### PERMISSIBLE VELOCITY

The highest velocity at which water is permitted to pass through a structure or conduit without excessive damage.

### OVERGEAR

A gear train in which the angular velocity ratio of the driven shaft to driving shaft is greater than unity, as when the propelling shaft of an automobile revolves faster than the engine shaft.

### OTTO-LARDILLON METHOD

A method of computing trajectories of missiles with low velocities (so that drag is proportional to the velocity squared) and quadrant angles of departure that may be high, in which exact solutions of the equations of motion are arrived at by numerical integration and are then tabulated.

### NEWTONIAN REFERENCE FRAME

One of a set of reference frames with constant relative velocity and within which Newton's laws hold; the frames have a common time, and coordinates are related by the Galilean transformation rule.

### MODULATE

To vary the amplitude, frequency, or phase of a wave, or vary the velocity of the electrons in an electron beam in some characteristic manner.

### MIST EXTRACTOR

A device that removes liquid mist or droplets from a gas stream via impingement, flow-direction change, velocity change, centrifugal force, filters, or coalescing packs.

### MICROPHONE TRANSDUCER

[ENG ACOUS] A device which converts variation in the position or velocity of some body into corresponding variations of some electrical quantity, in a microphone.

### MECHANICAL OHM

A unit of mechanical resistance, reactance, and impedance, equal to a force of 1 dyne divided by a velocity of 1 centimeter per second.

### LOW VELOCITY

Muzzle velocity of an artillery projectile of 2499 feet (762 meters) per second or less.

### LOW-PRESSURE TORCH

A type of torch inwhich acetylene enters a mixing chamber, whereit meets a jet of high-pressure oxygen; theamount of acetylene drawn into the flame is con-trolled by the velocity of this oxygen jet. Also known as injector torch.

### Related questions

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