A series of general electrical symbols commonly used in mechanical drawing.

Electrical Symbols

A series of general electrical symbols commonly used in mechanical drawing.

"Use the T square and 45 degree triangle to divide the square as indicated, the size of the small squares being ½". This is an excellent test of precision in measurement and lining. Care must be observed in the inking of this figure to allow each line to dry before inking the next one." —Anthony, 1904

Drawing Diagonal Lines with T Squares and Triangle

"Use the T square and 45 degree triangle to divide the square as indicated, the size of the small squares…

T—squares can be temporarily adjusted by putting the thumb tack in the head as illustrated. This is used when the previous work does not align with the T-square.

Temporary Adjustment T-square

T—squares can be temporarily adjusted by putting the thumb tack in the head as illustrated. This…

The illustration detailing of a screw thread. Threads are created by drawing a cylindrical shape at a constant diameter. The pitch, length between the threads, is drawn along the cylinder at an angle.

Drawing Screw Thread

The illustration detailing of a screw thread. Threads are created by drawing a cylindrical shape at…

The exercise problem of creating a three piece elbow development or rolled out image of the cylinder using projections or with dividers.

Development Exercise of Cylinder using Three Piece Elbow

The exercise problem of creating a three piece elbow development or rolled out image of the cylinder…

An illustration of even line shading using ruled lines. Lined shading is commonly used in patents.

Even Line Shading Tint

An illustration of even line shading using ruled lines. Lined shading is commonly used in patents.

An illustration of creating a line shading from dark to light. The lines are gradually become thin. The pen is slightly changed throughout the drawing.

Line Shading Dark to Light Tint

An illustration of creating a line shading from dark to light. The lines are gradually become thin.…

An exercise in creating a line shading, where the line is becoming thicker. The pen is slightly changed throughout the drawing.

Line Shading Light to Dark Tint

An exercise in creating a line shading, where the line is becoming thicker. The pen is slightly changed…

Exercise problem to develop, or rolled out, image of the triangular pyramid by creating an equal length of the edges of each triangle.

Development Exercise of Triangular Pyramid

Exercise problem to develop, or rolled out, image of the triangular pyramid by creating an equal length…

"If the cylinder A were to be developed a right section as at S—S would have to be taken, whose stretchout would be a straight line. If the cutting planes were taken at uniform distances apart, or at random, the elements would not be spaced uniformly on the stretchout but would be found as they project on the turned section of S—S." —French, 1911

Two Cylinders with Axes Not Intersecting

"If the cylinder A were to be developed a right section as at S—S would have to be taken, whose…

"The intersection of two cylinders might represent a dome on a boiler. If the top view of cylinder A is divided into a number of equal parts the points will represent the top views of elements."—French, 1911

Intersection of Two Cylinders

"The intersection of two cylinders might represent a dome on a boiler. If the top view of cylinder A…

Vertical line is drawn downward with the pencil held with freedom, not close to the point.

Sketching Vertical Line

Vertical line is drawn downward with the pencil held with freedom, not close to the point.

A wrought iron conventional cross hatching symbol.

Mechanical Drawing Cross Hatching of Wrought Iron

A wrought iron conventional cross hatching symbol.

The conventional cross hatching mechanical drawing symbol for wrought steel.

Mechanical Drawing Cross Hatching of Wrought Steel

The conventional cross hatching mechanical drawing symbol for wrought steel.