An old method of reproducing drawings that wound up with the copies being blue background with the lines in white. The original drawing was fed through rollers with the blank paper that exposed it to light. Then the blank paper was devleoped by exposing it amonia---very smelly process. The paper would develope into a blue color and the exposed lines were white---usually.
A "blueprint" is an old way of copying an original drawing onto blueprint paper. UV light is used to expose the blueprint paper, and ammonia is used to develop the image. Sometimes the term, "Blueprint" is a way to say, "construction drawings", which may include plan views, elevation views, cross sections, profiles, or details. They are drawn by drafters, engineers, architect, or anyone with the knowledge and a CAD program or (shudder) pen or pencil on paper, linen or polyester film.
when reading a blueprint, a general tolerance would apply for all dimensions that are not individually identified. eg, all tolerances are +\- .030" General tolerances are normally found in the information blocks of the blueprint. If for example a tighter tolerance is required, then a specific tolerance is noted for certain areas of the blueprint. These tolerances are normally found beside the affected area.
Induction Unit
in 1842 by John Fredrick William Hershel
General assembly drawing. General Arrangement Drawing
A blueprint is a design plan or technical drawing.
Its called a Blueprint
A blueprint is also called an architectural plan or technical drawing. It is a detailed and scaled drawing used in construction and engineering to communicate the design and specifications of a project.
on the bill of materials
Picture, drawing, sketch, plan, blueprint.
A title block on a blueprint typically includes information such as the project name, drawing title, identification number, scale, key notes, date of creation, and the name of the individual or firm responsible for the drawing.
Blueprint, drawing, sketch, etc. that shows layout of piping for plumbing system.
A leader line is a thin line on a design or blueprint that is used to connect a dimension line with a particular area or point on the drawing.
That depends entirely on what scale the drawing is !
Frederick Samuel Nicholson has written: 'Mechanical drawing' -- subject(s): Mechanical drawing 'Blueprint reading' -- subject(s): Blueprints
"NS" on a blueprint typically stands for "not specified" or "not shown." It is used to indicate that a specific detail or dimension is not provided on that particular drawing and may need to be clarified or determined through other means.
Medium solid line