rocker

1. any of various devices that transmit or operate with a rocking motion

2. a steel tool with a curved toothed cage, used to roughen the copper plate in engraving a mezzotint

a. an ice skate with a curved blade

b. the curve itself

4. Skating

a. a figure consisting of three interconnecting circles

b. a half turn in which the skater turns through 180?, so facing about while continuing to move in the same direction

Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

rocker

[′räk·ər]

(civil engineering)

A support at the end of a truss or girder which permits rotation and horizontal movement to allow for expansion and contraction.

(graphic arts)

A type of chisel, with a sharp beveled edge, used in mezzotint engraving; it is set on the surface of a copper plate and rocked back and forth to produce a rough grain, which, when printed, produces a velvety black.

(mining engineering)

A small digging bucket mounted on two rocker arms in which auriferous alluvial sands are agitated by oscillation, in water, to collect gold.

(ordnance)

Movable, built-in support in a field gun carriage, between the trail and the cradle, that allows changes in elevation to be made without disturbing the angle of position setting.

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References in periodicals archive

At the age of seventeen Rocker joined the German Social Democratic Party, but soon became critical of its rigid and authoritarian ethos and its statist politics, that derived essentially from the Marxists Friedrich Engels and Ferdinand Lassalle.

Guest editorial Rudolf Rocker 1873-1958. A tribute

Paul was eventually rescued by four firefighters who screwed the frame off the rocker to release him.

Dad stuck in children's play park rocker has to be rescued by firefighters; Paul Clark, 37, from Nottingham, East Midlands, got stuck while trying to show his daughter how to use the rocker

He said it was from the band that he learnt what it really meant to be a rocker. 'It is not only about the dress code, it is about discipline and helping people in the society,' he said.

'We are not thugs'

Inspection IAW SA-167 found cylinder numbers 2 and 4 intake and exhaust pushrods and rocker arms were abnormally worn.

Pushrods

The Baby Rocker is also in Patent Pending status within the United States Patent and Trademark Office.

Innovation Direct[TM] Leading the Way in Marketing of Baby Rocker Invention

Kossoff's three stories--of Rocker, the anarchists and the city--are wrapped thematically by a concern with the effects of urban renewal on cultural memory.

Adam Kossoff, The Anarchist Rabbi (2014), 44 minutes

The bank holiday began with tourists flocking to the coast but ended with them fleeing for their lives as Mods and Rockers turned beaches into battlefields.

The Modern World; THE BEACH BAT TLES THAT ROCKED THE UK IN '64; 50 years ago Mods fought with Rockers at the seaside, in scenes that shocked the nation and heralded our first true youth culture. Here, one of the men at the notorious Brighton brawl looks back on the chaos..

The album was credited as the "turning point" in the rocker's career.

Rocker Adams to play the LG