pantograph

/'pæntəgrɑ:f/

Thân thiện

An architect uses a pantograph to enlarge a detailed floor plan.

Definition

Noun: 1. A mechanical device used to copy a drawing, figure, or plan at a different scale (usually larger or smaller). It consists of linked rods arranged in a parallelogram, allowing a tracing point to be moved over an original while a pen or pencil attached to the linkage reproduces the movement at a predetermined scale. 2. A collapsible, articulated framework mounted on the roof of an electric train or tram to collect current from an overhead wire. This sense derives from the device's resemblance to the drawing instrument's folding structure.

Usage

The word "pantograph" is used to describe a specific mechanical apparatus. It is a technical term common in engineering, design, and railway contexts.

Examples

• As a drawing/copying device:
  • The draftsman used a pantograph to accurately enlarge the architectural blueprint.
  • Before digital plotters, a pantograph was an essential tool for scaling technical drawings.
• As a current collector on a train:
  • The electric locomotive lowered its pantograph as it entered the depot.
  • A common point of failure is the carbon contact strip on the pantograph.

Advanced Usage

• "To pantograph" (verb, rare/technical): The act of using a pantograph to copy or scale a drawing.
  • The design was pantographed onto the larger template.

Variants and Related Words

• Pantographic (adjective): Relating to or having the properties of a pantograph.
  • The machine uses a pantographic linkage system for precise movement.
• Pantography (noun, rare): The art or process of using a pantograph.

Synonyms

• Copying instrument (for the drawing tool).
• Current collector or overhead collector (for the railway component).

Different Meanings

1. Primary Meaning (Drawing): A device for scaling drawings.
2. Secondary Meaning (Railway): A device for collecting electric power from an overhead line. This is the more common meaning in everyday contexts related to transportation.

Notes

• The railway pantograph is so named because its folding, scissor-like mechanism visually resembles the linked rods of the drawing pantograph.
• While the drawing tool is now largely obsolete, replaced by digital methods, the railway pantograph remains a critical and widely used component in modern electric rail systems.

Học thuật

Noun

1. mechanical device used to copy a figure or plan on a different scale