Surveyors sometimes use plumb bobs for lining up points or transferring them. Excavation and foundation contractors rely upon the plumb line, and constructing a chimney the tool can indicate whether a flue is running true vertical or veering off plumb.
What is plumb line in construction?
In construction or carpentry, the term plumb refers to a line or feature that is perfectly vertical. In technical design, it represents an imaginary line that runs straight to the center of the earth. Plumb is the counterpart to level, which means to be perfectly horizontal.
What is a plumb line used for in physics?
: a line that has a weight (as a plumb bob) at one end and is used to find out whether something is vertical or to measure depth.
Why do they call a plumb line?
A plumb line is a light line with a weight (plumb bob) at one end that, when suspended next to a workpiece, defines a vertical line. Plumb comes from the Latin plumbum, or “lead,” the material that replaced stone as…
What is a plumb line in surveying?
plumb line. [surveying] A line that corresponds to the direction of gravity at a point on the earth’s surface; the line along which an object will fall when dropped.
How do I find a plumb line?
Measure the distance from the vertical surface to the top of the string. Measure the distance from the vertical surface to the tip at the bottom of the weight. When the two measurements match, the surface is plumb. If not, adjust the surface until the measurements match.
What is the purpose of a plumb bob?
A plumb bob is a pointed weight attached to the end of the string and is used to find a vertical reference line called plumb. Plumb is the vertical equivalent to a spirit level.
Who invented the plumb line?
Egyptians
Egyptians invented the plumb bob more than 4000 years ago. It has two unassuming parts—a string and a weight. A plumb was used to establish vertical points that were crucial in the construction of Egypt’s buildings, pyramids and canals.
What is another word for plumb line?
The words perpendicular and vertical are common synonyms of plumb. While all three words mean “being at right angles to a base line,” plumb stresses an exact verticality determined (as with a plumb line) by earth’s gravity.
What’s the difference between square and plumb?
Square means that corners are 90 degrees. Level is always gauged by a device, such as a carpenter’s level, but level does not always mean parallel to the ground. Plumb is vertical, most accurately gauged by a plumb bob. Levels can show when posts are plumb.
What does it mean to plumb a wall?
While level means horizontally flat, plumb, meaning vertically flat, is used to describe the up and down orientation, such as walls. The School of Cooperative Technical Education describes the meaning of plumb as being perfectly straight up and down, and when a horizontal item has no tilt, it is level.
What do you call a wall that sticks out?
A pony wall is a short wall. In different circumstances, it may refer to: a half wall that only extends partway from floor to ceiling, without supporting anything. a stem wall, a concrete wall that extends from the foundation slab to the cripple wall or floor joists.
How plumb Should a wall be?
The Residential Construction Performance Guidelines suggest a maximum out of plumb of 3/8″ in 32″ vertically, while the Handbook of Construction Tolerances suggests that this may need to be tightened to 1/4″ in 10ˈ when finishes such as gypsum wallboard and plaster are used.
Why are my walls not straight?
Uneven walls are usually a case of the framing being installed slightly on an angle or because of a warp in the wood. The best time to fix an uneven wall is before any drywall is applied, but there are still ways to fix the issue even after the finish material is on the walls.
What are different types of surveying?
Based on various types of instruments used, surveying can be classified into six types.
- Chain surveying.
- Compass surveying.
- Plane table surveying.
- Theodolite surveying.
- Tacheometric surveying.
- Photographic surveying.
Which line is perpendicular to plumb line?
Explanation: Level Line: Any line laying on the level surface is called as the level line. Obviously, the level line is perpendicular to the plumb line.
Which line is normal to plumber line at all points?
level line
The line normal to the plumb line is known as level line.
Do you need a plumb line for wallpaper?
For a successful hanging job, it is essential that your wallpaper be hung straight. Most homes, however, have walls and ceilings that are often slightly out of alignment. To compensate for this, you must begin your job with a truly vertical plumb line.
What trade uses plumb bob?
Surveyors
Surveyors sometimes use plumb bobs for lining up points or transferring them. Excavation and foundation contractors rely upon the plumb line, and constructing a chimney the tool can indicate whether a flue is running true vertical or veering off plumb.
What is a plummet line?
Noun. plummet (plural plummets) (archaic, nautical) A piece of lead attached to a line, used in sounding the depth of water, a plumb bob or a plumb line.
What can I use as a plumb bob?
Many chalk lines can be used as plumb-bobs as they are essentially a weight tied to a string. Some even have a pointed bottom to make accurate marking easier.