ClipArt ETC
This is an advance turn arrow pointed to the left. The shaft is bent at a 45-degree angle.

Left Advance Turn Arrow Auxiliary, Outline

This is an advance turn arrow pointed to the left. The shaft is bent at a 45-degree angle.

This is an advance turn arrow pointed to the left. The shaft is bent at a 45-degree angle.

Left Advance Turn Arrow Auxiliary, Silhouette

This is an advance turn arrow pointed to the left. The shaft is bent at a 45-degree angle.

2 intersecting lines, one of which is vertical and one of which is horizontal. The intersection forms a right angle.

Intersecting Lines, 2 Perpendicular

2 intersecting lines, one of which is vertical and one of which is horizontal. The intersection forms…

A 6 inches diameter protractor to measure angles to half degrees, made of brass or German silver. They are useful in map and topographical work.

Semicircular Protractor

A 6 inches diameter protractor to measure angles to half degrees, made of brass or German silver. They…

Dotting pen is used to create five different dotted and dashed lines. The dot lengths can be varied by changing the angle of the handle.

Dotting Pen

Dotting pen is used to create five different dotted and dashed lines. The dot lengths can be varied…

The arrows shows the motion direction of drawing a 30-degrees, 45-degrees, or a-60 degrees angle using a 60-degree triangle.

Drawing Lines using Triangle, 30-, 45-, 60-Degrees

The arrows shows the motion direction of drawing a 30-degrees, 45-degrees, or a-60 degrees angle using…

The 45-degree triangle can be used to make a line at a multiple of 15 degrees.

Drawing Lines using Triangle at Angles in Multiples of 15 degrees

The 45-degree triangle can be used to make a line at a multiple of 15 degrees.

Parallel lines are drawn by holding the triangle against the T-square at an angle, or another triangle, then slip the first triangle onto the required position.

Drawing Parallel Lines Using T-square and Triangle

Parallel lines are drawn by holding the triangle against the T-square at an angle, or another triangle,…

Perpendicular lines are drawn by fitting the hypothenuse of the triangle to the T-square at an angle, or another triangle. Then, turn the triangle so that the hypothenuse is perpendicular to the line.

Drawing Perpendicular Lines Using T-square and Triangle

Perpendicular lines are drawn by fitting the hypothenuse of the triangle to the T-square at an angle,…

"An exercise in starting and stopping short lines. Draw three-inch square. Draw diagonals with 45-degree triangle. With scale lay off 3/8" spaces along the diagonals, from their intersection. With 45-degree triangle complete figure, finishing one-quarter at a time." —French, 1911

Drawing Street Paving Intersection

"An exercise in starting and stopping short lines. Draw three-inch square. Draw diagonals with 45-degree…

"On base AB, 3 1/2" long construct an equilateral triangle, using the 60-degree triangle. Bisect the angles with the 30-degree angle, extending the bisectors to the opposite sides. With these middle points of the sides as centers and radius equal to 1/2 the side, draw arcs cutting the bisectors. These intersection will be centers for the inscribed circles. With centers on the intersection of these circles and the bisectors, round off the points of the triangle as shown." —French, 1911

Drawing Tangent Circles and Lines with Compass and Triangles

"On base AB, 3 1/2" long construct an equilateral triangle, using the 60-degree triangle. Bisect the…

The cone is sliced by a ellipse by making an angle within the plane. This can be drawn with knowing characteristics of each shape.

Conic Section Using Ellipse

The cone is sliced by a ellipse by making an angle within the plane. This can be drawn with knowing…

The cone is sliced by a hyperbola within a plane. The angle of the hyperbola will make a smaller angle than the other elements.

Conic Section Using Hyperbola

The cone is sliced by a hyperbola within a plane. The angle of the hyperbola will make a smaller angle…

The end wrench differs from the monkey wrench in that the gripping faces of the jaws are displaced to a 15 degree angle relative to the tools handle.

Wrench Handle

The end wrench differs from the monkey wrench in that the gripping faces of the jaws are displaced to…

A ladder is an inclined set of steps, hinged in the middle to form an inverted V, with stays to keep the two havles at a fixed angle.

Folding Step Ladder

A ladder is an inclined set of steps, hinged in the middle to form an inverted V, with stays to keep…

A collapsible boat includes a skeleton and an impervious skin tensioned about the skeleton. The skeleton includes a plurality of longitudinal and transverse frame members forming stringers and former, the frame members being attached to the gunwale frame of the boat and the transverse members being turn able relative to the gunwale frame. The flexible skin is permanently attached to the gunwale frame and the longitudinal frame members are hinge connected to the gunwale frame at front and rear portions thereof. The longitudinal members are turn able relative to the gunwale frame in a direction transversely of the boat, and the longitudinal frame members along their horizontal portion each being provided with one or more hinge members turn able through an angle of 180°.

Collapsible Boat

A collapsible boat includes a skeleton and an impervious skin tensioned about the skeleton. The skeleton…

"A circle may be shaded by shifting the center on a 45-degree line toward the lower right hand corner... by keeping the needle in the center after drawing the circle and springing the compass out and gradually pressing with the middle finger in the position as shown." —French, 1911

Shading a Circle Using Compass

"A circle may be shaded by shifting the center on a 45-degree line toward the lower right hand corner...…

These calipers are used to measure the external size of an object. The same observations and technique apply to this type of caliper, as for the above inside caliper. With some understanding of their limitation and usage these instruments can provide a high degree of accuracy and repeatability. They are especially useful when measuring over very large distances, consider if the calipers are used to measure a large diameter pipe.

Precision Calipers and Dividers

These calipers are used to measure the external size of an object. The same observations and technique…

This is a combination step ladder, clothes rack, and ironing board. A step ladder is hinged in the middle to form an inverted V, with stays to keep the two halves at a fixed angle. A clothes rack refers to a frame upon which clothes are hung after washing to easily let each garment dry. Most ironing is done on an ironing board, a small, portable, foldable table with a heat resistant top. Some commercial-grade ironing boards incorporate a heating element and a pedal-operated vacuum to pull air through the board and dry the garment.

Combination Step Ladder, Clothes Rack, and Ironing Board

This is a combination step ladder, clothes rack, and ironing board. A step ladder is hinged in the middle…

For safety, a rigid ladder should be leaned at an angle of about fifteen degrees to the vertical. In other words, the distance from the foot of the ladder to the wall should be about one quarter of the height of the top of the ladder. At steeper angles, the ladder is at risk of toppling backwards when the climber leans away from it

Four Wheeled Cart Mount for Ariel Ladder

For safety, a rigid ladder should be leaned at an angle of about fifteen degrees to the vertical. In…

Padlocks are portable locks used to protect against theft, vandalism, sabotage, espionage, unauthorized use, and harm. They are designed to protect against some degree of forced and surreptitious entry.

Mechanism Depiction of a, Padlock

Padlocks are portable locks used to protect against theft, vandalism, sabotage, espionage, unauthorized…

A printers quoin is a device for locking up or fastening type in chases or galleys.

Printers Quoin

A printers quoin is a device for locking up or fastening type in chases or galleys.

Bevel, is a and tool consisting of two rules that are hinged together so you can draw or measure angles of any size. A sliding T bevel is an adjustable gauge for setting and transferring angles. The handle is usually made of wood or plastic and is connected to a metal blade with a thumbscrew or wing nut.

Bevel Square

Bevel, is a and tool consisting of two rules that are hinged together so you can draw or measure angles…

An office chair, or desk chair, is a type of chair that is designed for use at a desk in an office. It is generally comfortable and adjustable and can swivel 360 degrees.

Adjustable Office Chair

An office chair, or desk chair, is a type of chair that is designed for use at a desk in an office.…

A diagram illustrating the airplane's angle of incidence at axis A, direction of motion and thrust.

Plane Angle of Incidence

A diagram illustrating the airplane's angle of incidence at axis A, direction of motion and thrust.

The diagram illustrating the plane's angle of incidence pointing down at the motion axis. The plan will exert momentum and thrust force from angle of incidence.

Plane Pointing Down Angle of Incidence

The diagram illustrating the plane's angle of incidence pointing down at the motion axis. The plan will…

An airplane flying above the show illustrating the aerodynamics of the plane with the tail wing at the same angle as the main body. This reduces the lift of the plane by decreasing the angle of incidence.

Airplane Flying Above Shore

An airplane flying above the show illustrating the aerodynamics of the plane with the tail wing at the…

A plane flying above land illustrating the use of ailerons to adjust the angle of incidence to adjust the lift. Ailerons are located at the wing tips and controlled by the pilot.

Airplane Flying Above Land

A plane flying above land illustrating the use of ailerons to adjust the angle of incidence to adjust…

A propeller airplane with rudder, elevator, and ailerons. The rudder stabilizes the plane vertical, and elevator adjusts the pressure exerted by the horizontal stabilizer for a downward force.

Airplane Rudder and Elevator

A propeller airplane with rudder, elevator, and ailerons. The rudder stabilizes the plane vertical,…

An illustration of the plane flying over land from point A to B by flying the plane with the direction of the plane. Then, flying to point D by creating a diagonal line at 100 mph onto destination point B.

Aeroplane Flying Over Plane

An illustration of the plane flying over land from point A to B by flying the plane with the direction…

A pilot's cockpit from a propeller aeroplane, or airplane. The diagram illustrates the different parts of the cockpit used to control the plane. The cockpit contains gauges; watch; joystick controlling ailerons and elevators; and wires to adjust wings.

Aeroplane Cockpit

A pilot's cockpit from a propeller aeroplane, or airplane. The diagram illustrates the different parts…

Illustration of a propeller aeroplane, or airplane, with lower tail in flight.

Aeroplane Low Tail Design

Illustration of a propeller aeroplane, or airplane, with lower tail in flight.

The propeller airplane, or aeroplane, design in fast landing. This design requires a large landing area to stop the plane.

Aeroplane Low Tail Fast Landing Design

The propeller airplane, or aeroplane, design in fast landing. This design requires a large landing area…

A design of the propeller airplane, or aeroplane, in flight with a higher tail to create an angle of incidence when landing.

Aeroplane High Tail Normal Attitude Design

A design of the propeller airplane, or aeroplane, in flight with a higher tail to create an angle of…

A propeller airplane, or aeroplane, design with a high tail. This design creates a larger angle of incidence for a effective air brake to stop the plane in a shorter distance.

Aeroplane High Tail Slow Landing Design

A propeller airplane, or aeroplane, design with a high tail. This design creates a larger angle of incidence…

A motion diagram of the aeroplane, or airplane, illustrating the plane's direction to create thrust and small angle of incidence relative to the horizontal line.

Aeroplane Motion Diagram

A motion diagram of the aeroplane, or airplane, illustrating the plane's direction to create thrust…

An illustration of stabilizing the plane by setting the back wing at less angle of incidence than the front main wings creating a dihedral angle.

Stabilizing Aeroplane using Dihedral Angle

An illustration of stabilizing the plane by setting the back wing at less angle of incidence than the…

The diagram illustrating an approximate angle of flying an aeroplane, or airplane, flying upside down and in a loop by adjusting the throttle of the engine.

Aeroplane Looping and Upside Down Flying

The diagram illustrating an approximate angle of flying an aeroplane, or airplane, flying upside down…

The illustration showing the centrifugal governor metal ball removed from the lathe to draw 180 degree lines. These lines are used to guide the machinists to create the balls in a lathe.

Metal Centrifugal Governor Ball Height Gage

The illustration showing the centrifugal governor metal ball removed from the lathe to draw 180 degree…

An illustration of creating spirals on a steel rod using mandrel and lathe. The spiral is created by revolving the steel rod on the lathe while placing a mandrel on the rod at an angle.

Spiral Turning Device

An illustration of creating spirals on a steel rod using mandrel and lathe. The spiral is created by…

A spiral milling apparatus for a lathe to create drills and flutes. The working surface is fastened to the lathe by the bolt on the left. While the rod is spinning, a spindle is inserted in a hole at a desired angle.

Spiral Milling Lathe

A spiral milling apparatus for a lathe to create drills and flutes. The working surface is fastened…

"Where the lathe has no special taper turning attachment, the rig here described can readily be made and applied. The hand wheel of the cross feed is removed, and replaced by a hard—wood disk S that has a rim groove for a stout cord A. One end of this cord is attached to the tail stock at B, by means of a bent metal strip D. The conicity or degree of taper will be determined by the diameter of the disk S." —Grimshaw, 1902

Taper Turning and Boring Lathe Rig

"Where the lathe has no special taper turning attachment, the rig here described can readily be made…

"The Austrian counterscarp casement is constructionally simple. Under the counterscarp wall, on the further side of the ditch, facing the salient angle of the of the work, a chamber is formed with embrasures for rifle, machine gun or light artillery fire along the two adjacent ditch lengths." — Encyclopaedia Britannica, 1922

Austrian Fort Counterscarp Casement

"The Austrian counterscarp casement is constructionally simple. Under the counterscarp wall, on the…

The illustration shows a schematic view of the Stokes Mortar being mounted onto the bipod. The mortar is mounted on to the bipod. The bipod adjusts the mortar's angle by adjusting the the elevating handle moving the gears.

Front View of Stokes Mortar with Bipod

The illustration shows a schematic view of the Stokes Mortar being mounted onto the bipod. The mortar…

A light minenwerfer with 7.6 cm caliber designed by German during World War I. The series of gears adjusts the angle of the barrel by turning the hand crank.

Rifled Light Minenwerfer Mortar

A light minenwerfer with 7.6 cm caliber designed by German during World War I. The series of gears adjusts…

A light carriage minenwerfer class mortar used for direct fire. The barrel and the shifting lever is moved up during loading, while the angle of the mortar is adjusted by the elevating screw in the front.

Rifled Carriage Light Minenwerfer Mortar

A light carriage minenwerfer class mortar used for direct fire. The barrel and the shifting lever is…

A rectangular cube drawn by using oblique projection. The original cube was projected parallel at a certain angle. The cube was drawn by drawing the front square in the front, then projecting it in an angle while connecting the edges.

Oblique Projection of a Rectangular Cube

A rectangular cube drawn by using oblique projection. The original cube was projected parallel at a…

The illustration showing angles of 15, 30, and 45 degrees at angles 45 and 30 degrees. Measurement of angles is created by drawing at point E at 45 or 30 degrees, then draw a straight line from E to estimate the desired angle.

Measuring Angles in Isometric Planes

The illustration showing angles of 15, 30, and 45 degrees at angles 45 and 30 degrees. Measurement of…

A isometric drawing of the oblique and horizontal wood combined together. The image is drawn by creating the squared cube base, then, at the desired angle, draw the 3D view of the wood sticking up.

Isometric View of Oblique Timber Framed in to Horizontal Timber

A isometric drawing of the oblique and horizontal wood combined together. The image is drawn by creating…

A helix spiral generated by revolving about an axis at an angle less than 90 degrees. This generates a cylindrical or coned shape as the tip meets.

Helix Spiral

A helix spiral generated by revolving about an axis at an angle less than 90 degrees. This generates…

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…

A problem exercise using a t square and 45 degree triangle to divide the paper into half inch squares. Then, divide the squares with diagonal lines both sides of the paper.

Squares Diagonal Lines Repeating Patterns

A problem exercise using a t square and 45 degree triangle to divide the paper into half inch squares.…

"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…

A diagonal line pattern drawing exercise in for T square and triangle. The image is constructed by dividing the paper into squares with the T square, and the diagonal lines are drawn using a 45 degree triangle.

Drawing Exercise for Drawing Diagonal Line Pattern using T Square and Triangle

A diagonal line pattern drawing exercise in for T square and triangle. The image is constructed by dividing…

The construction of a star with square overlapping each other using a triangle and T square. This image is drawn by dividing the paper with dashed lines using T square. Using the 45 degree triangle, draw diagonal lines to create the star and the star.

Constructing Star and Box Overlap Pattern using T Square and Triangle

The construction of a star with square overlapping each other using a triangle and T square. This image…

A problem exercise to construct a star overlapping square using a triangle and T square. The image is drawn by dividing the paper with dashed lines using T square. Using the 45 degree triangle, draw diagonal lines to create the star and the star.

Constructing 4 Point Star Overlapping Box Pattern using T Square and Triangle

A problem exercise to construct a star overlapping square using a triangle and T square. The image is…

A hinge is a type of bearing that connects two solid objects, typically allowing only a limited angle of rotation between them.

Door Style Hinge

A hinge is a type of bearing that connects two solid objects, typically allowing only a limited angle…

"With a 45 degree triangle draw lines AC and BD through the center and construct three squares. Set the bow—pencil to a radius of 3∕8' and describe a circular arc in the corner of each square just touching, but not intersecting, the sides of the square. Ink the circular arcs first." —Anthony, 1904

Mechanical Drawing Exercise Three Inscribed Squares with Rounded Corners using Triangle and Bow

"With a 45 degree triangle draw lines AC and BD through the center and construct three squares. Set…

"Repsolds' more recent form of the spider—line micrometer (since 1893) for large telescope. Quick motion in Position—angle for rough setting or for the measurement of close double stars is given by the large ring R." —Encyclopaedia Britannica, 1910

Repsolds Spider Line Micrometer for Quick Position Angle Motion

"Repsolds' more recent form of the spider—line micrometer (since 1893) for large telescope. Quick…

An illustration of the position and the size of the image viewed by the eye. The eye approximates the the height of the image. The image's height is the hypotenuse of the triangle, creating an angle with the eye. This image is then reflected upside down in the eye.

Position and Size of Image for Eye Optics

An illustration of the position and the size of the image viewed by the eye. The eye approximates the…