Drawing templates, circles, curvilinear ellipsometers and other geometric figures are used when the standard graphic must be drawn "by hand" repeatedly. A drafting template is a flat piece of plastic with the standard symbols cut out inside. The elaboration of architectural models and figures are used as a guide to draw symbols of various types on the project. There are models for different scales of representation.
Drafting templates are also available for a variety of floor plans and elevation / elevation systems. There are many symbols that can be represented by a mask, furniture, doors, windows, taps, electrical devices, urban symbols, etc ... etc ...

    

The curvilinear is a square in plastic, wood or metal used in manual drawing to trace curves of various types of variable radius.
The curvilinear models were decisively developed by the German mathematician Ludwig Burmester (1840-1927). In its function it has now been largely replaced by CAD programs for computers, but is still used in schools.



In the image, the first model is mainly used to help the draftsman in drawing hyperbole; the second mainly for ellipses.
Another method to draw special curves is to use an elastic strip that is held in position on the design by suitable weights. This method was used particularly in naval design for tracing the lines started on the hulls.
Yet another method is to use a deformable rod which is shaped as needed; these rods, however, after being used several times remain more or less wavy, making them unusable.
 
Some contents of this page were taken from: https://it.wikipedia.org/wiki/Curvilineo
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