Journal of the Association of Engineers, India

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Spring-Loaded Compass


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1 Jadavpur University, Calcutta, India
     

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We can easily draw a circle on a plane surface by means of an ordinary pencil compass. Unfortunately, we do not have any device to draw a curve on a three dimensional surface, the projection of which on a plane surface is a circle. At present, these problems are solved by means of geometrical projection, known as Descriptive Geometry. An instrument has been developed, which is a modification of an ordinary compass and is shown in Fig. 1. It can be easily seen that the tracing arm of the instrument is capable of moving along the axis of the arm, and is actuated by means of a spring, and hence the name spring-loaded compass.
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  • Spring-Loaded Compass

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Authors

Pradip Kumar Routh
Jadavpur University, Calcutta, India

Abstract


We can easily draw a circle on a plane surface by means of an ordinary pencil compass. Unfortunately, we do not have any device to draw a curve on a three dimensional surface, the projection of which on a plane surface is a circle. At present, these problems are solved by means of geometrical projection, known as Descriptive Geometry. An instrument has been developed, which is a modification of an ordinary compass and is shown in Fig. 1. It can be easily seen that the tracing arm of the instrument is capable of moving along the axis of the arm, and is actuated by means of a spring, and hence the name spring-loaded compass.