Trimmer (surname)

Trimmer is a surname, and may refer to:

Trimmer

Trimmer may refer to:

See also

Coal trimmer

A coal trimmer or trimmer is a position within the engineering department of a coal fired ship which involves all coal handling tasks starting with the loading of coal into the ship and ending with the delivery of the coal to the stoker.

The trimmers worked inside the coal bunkers located on top of and between the boilers. Trimmers used shovels and wheelbarrows to move coal around the bunkers in order to keep the coal level, and to shovel the coal down the coal chute to the firemen below, who shoveled it into the furnaces. If too much coal built up on one side of a coal bunker, the ship would actually list to that side.

Trimmers were also involved in extinguishing fires in the coal bunkers. Fires occurred frequently due to spontaneous combustion of the coal. The fires had to be extinguished with fire hoses and by removing the burning coal by feeding it into the furnace.

Of the engineering crew, the trimmers were paid the least. The working conditions of a trimmer were poor, primarily as a result of their environment: the inside of a coal bunker was poorly lighted, full of coal dust, and extremely hot due to residual heat emanating from the boilers.

Trimmer (electronics)

A trimmer or preset is a miniature adjustable electrical component. It is meant to be set correctly when installed in some device, and never seen or adjusted by the device's user. Trimmers can be variable resistors (potentiometers), variable capacitors, or trimmable inductors. They are common in precision circuitry like A/V components, and may need to be adjusted when the equipment is serviced. Trimpots are often used to initially calibrate equipment after manufacturing. Unlike many other variable controls, trimmers are mounted directly on circuit boards, turned with a small screwdriver and rated for many fewer adjustments over their lifetime. Trimmers like trimmable inductors and trimmable capacitors are usually found in superhet radio and television receivers, in the intermediate frequency (IF), oscillator and radio frequency (RF) circuits. They are adjusted into the right position during the alignment procedure of the receiver.

Trimmers come in a variety of sizes and levels of precision. For example, multi-turn trim potentiometers exist, in which it takes several turns of the adjustment screw to reach the end value. This allows for very high degrees of accuracy. Often they make use of a worm-gear (rotary track) or a leadscrew (linear track).