Why do they call it a plumb bob?

Since plumb-bobs needed to be symmetrical objects and have a string attached to their axis of symmetry, it was important that the material they were made from could be easily shaped. In later ages, plumb-bobs were cast from lead, and it is from this that the plumb-bob gets its name. “Plumbum” is Latin for lead.

How heavy is a plumb bob?

At the other end of the scale, there are some plumb bobs used by bridge builders and in mine surveys that are very heavy and can weigh up to 200 pounds (90kg). For most domestic or on site purposes, plumb-bobs weighing between 4oz – 1lb (115-450gm) will be suitable.

What is the purpose of a plumb line?

A plumb line is a weight suspended from a string used as a vertical reference line to ensure a structure is centered. As they always find the vertical axis pointing to the center of gravity, they ensure everything is right, justified and centered.

Who uses a plumb line?

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 the plumb line posture?

The posture plumb line is an imaginary straight line from the top of the head to the floor. Perfect posture means our ears, shoulders, hips, knees and ankles stack up along this line.

What is a plumb point?

It is the point in the photo plane immediately below the lens at the instant of exposure. Also called camera nadir, photo plumb point, and a nadir point.

What are plumb dots on a laser level?

Dot lasers levels, also known as plumb laser levels, project laser dots either vertically, horizontally or at right angles allowing the user to establish plumb lines or right angles.

What is a laser plumb bob?

A laser plumb bob is a plumb bob which is uses a laser, instead of the more traditional weighted string. With a laser plumb bob, instead of using a weighted string, the user attaches the plumb bob to a point of interest or mounts it on a tripod, and then turns the laser on.

What is the meaning of plumb?

transitive verb. 1 : to weight with lead. 2a : to measure the depth of with a plumb. b : to examine minutely and critically plumbing the book’s complexities. 3 : to adjust or test by a plumb line.

What does make it plum mean?

It’s an adjective when it describes something that is perfectly vertical: “The wall is plumb.” It’s a verb when it identifies the action of making something plumb: “

What is the opposite of effortless?

Antonyms: hard, punishing, labor-intensive, exhausting, arduous, laborious, tiring, backbreaking, gruelling, difficult, operose, labored, leaden, Sisyphean, straining, laboured, plodding, wearying, heavy, dragging, strenuous, grueling, labour-intensive, effortful, wearing, toilsome. Synonyms: casual.

What is a good synonym for effortless?

Some common synonyms of effortless are easy, facile, light, simple, and smooth.

What is opposite of unknown?

Antonyms: legendary, notable, identified, better-known, proverbial, onymous, best-known, familiar, celebrated, suspected, renowned, famous, known, noted, far-famed, famed, glorious, illustrious, well-known. Synonyms: unidentified, strange, unnamed, unsung, obscure, nameless. nameless, unidentified, unknown, unnamed(adj …

What does effortless mean?

showing or requiring little or no effort