Mell What is a GAMMon REEL used for?
Retractable cord reel for use with plumb bob. Allows you to instantly set and adjust the height of the plumb bob without the need to constantly adjust the cord length. Draw the plumb bob to the desired length and stop with finger pressure.
What are plumb bobs used for?
DIY Dictionary: Plumb Bob A plumb bob is a weighted object connected to a string that can be used to establish a vertical line.
What is plumb bob in land surveying?
A plumb bob is used to check if objects are vertical. A plumb bob consists of a piece of metal (called a bob) pointing downwards, which is attached to a cord (see Fig. 4). When the plumb bob is hanging free and not moving, the cord is vertical.
Why is it called a plumb bob?
The first plumb-bobs were made of stone. Ancient civilisations used plumb-bobs for many applications and they made their tools out of the materials that were readily available to them. 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.
Why is it called plumb?
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…
Why is there a hole in the tip of a plumb bob?
The weight or “bob” is the part of the plumb-bob that is suspended by the string. The weight is symmetrical for balance, and typically has a pointed end for accurate alignment. At the opposite end there is a hole for the string to be fed through and tied.
What can I use instead of 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.
Why does plumb mean level?
A structure is often called “plumb,” meaning it is straight up and down, like the walls of a building. When something is “level,” it’s straight from side to side, like a shelf that’s been properly installed.