# ACCELERATION ANALYSIS

A mathematical technique, often done graphically, by which accelerations of parts of a mechanism are determined.

## Related Terms

### PILLAR CRANE

A crane whose mechanism can be rotated about a fixed pillar.

### PAIR

1. Two like conductors employed to form an electric circuit. 2. Two parts in a kinematic mechanism that mutually constrain relative motion; for example, a sliding pair composed of a piston and cylinder.

### NANSEN BOTTLE

A bottlelike water-sampling device with valves at both ends that is lowered into the water by wire; at the desired depth it is activated by a messenger which strikes the reversing mechanism and inverts the bottle, closing the valves and trapping the water sample inside. Also known as Petterson-Nansen water n-body problem depth for navigation purposes.

### MECHANISM

That part of a machine which contains two or more pieces so arranged that the motion of one compels the motion of the others.

### LOWER PAIR

A link in a mechanism in which the mating parts have surface (instead of line or point) contact.

### KNEE SWITCH

A control mechanism operated with knee movements by a seated worker.

### INTERNAL SPRING SAFETY RELIEF VALVE

A spring-loaded valve with a portion of the operating mechanism located inside the pressure vessel.

### INTAKE STROKE

The fluid admission phase or travel of a reciprocating piston and cylinder mechanism as, for example, in an engine, pump, or compressor.

### HYDROPNEUMATIC RECOIL SYSTEM

A recoil mechanism that absorbs the energy of recoil by the forcing of oil through orifices and returns the gun to battery by compressed gas.

### HYDRAULIC JACK

A jack in which force is applied through the mechanism of a hydraulic press.

### Related questions

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