The secondary mirror is continuously moved on and off source at approximately 7 Hz in order to remove the sky to zeroth order. This is done in addition to standard jiggling.
In hip hop music sampling, chopping is the "altering [of] a sampled phrase [or break] by dividing it into smaller segments and reconfiguring them in a different order."
A mechanical treatment whereby vegetation is concentrated near the ground and incorporated into the soil to facilitate burning or seedling establishment.
A form of site preparation in which a large, heavy cylindrical drum with cutting blades mounted parallel to its= axis is drawn across a site to break up, slash, or crush vegetation prior to (usually) burning and planting.