30-04-2021

Plumb-Bob



PRODUCTS

Liquid removed from tank tape measures have a rectangular plumb bob. To find the amount of liquid removed from a tank, lower the plumb bob until it makes contact with the liquid’s surface, then add the measurement from the plumb bob to the measurement from the blade. Unmarked plumb bob - 7.7 oz., 3 3/4 inches long - 739v. 83 00002, 8 oz plumb bob - 734c. Unmarked larger plumb bob- 739s. Connect with PREDCO call 231.867.2300 Web Hosting powered by Network Solutions® powered by Network Solutions®.

BobPlumb-Bob
  • LEVELS
      DIGITAL
      LEVELS      BOX
      LEVELS      I-BEAM
      LEVELS      TORPEDO
      LEVELS      BAMBOO
      LEVELS      OPTICAL
      LEVELS      SPECIAL PURPOSE
      LEVELS      LEVEL
      VIALS
  • LASERS
      ROTARY
      LASER LEVELS      DOT
      LASER LEVELS      LINE
      LASER LEVELS      INDUSTRIAL
      ALIGNMENT      TORPEDO
      LASER LEVELS      TRIPODS, DETECTORS & ACC.
  • MEASURING
      LASER DISTANCE
      MEASURING      DIGITAL
      MEASURING      TAPE
      MEASURES      LONG TAPE
      MEASURES      MEASURING
      WHEELS      STRAIGHT EDGES
      & CUTTING GUIDES
  • SQUARES
      FRAMING
      SQUARES      RAFTER SQUARES
      & PROTRACTORS      COMBINATION
      SQUARES      T-SQUARESSPECIAL PURPOSE
      SQUARES
  • MARKING
      CARPENTER
      PENCILS & CRAYONS      FLAGGING &
      BARRICADE TAPE      STAKE
      FLAGS      PLUMB
      BOBS

A plumb bob is a small piece of metal that weighs down a string attached to it to indicate plumb, which is an exact vertical position. Builders today consider the plumb bob a basic tool box item even though it is thought to date back to the ancient Egyptians. Research has suggested that Egyptians used plumb bobs to create the straight vertical lines of their pyramids.

Plumb-bob gravity

A simple plumb bob may be just a plain length of string with a piece of metal tied to it as a weight. Fancy plumb bobs may have decorative, carved wooden or stylish metal sections. Some plumb bobs available today are sold in woodworking kits. The finished plumb bob may be used as a Christmas ornament as well as a working tool. There are even plumb bob ornaments that feature 24 karat gold pointed tips.

While an ornamental plumb bob may have separate tip and body sections, purely functional plumb bobs are often just a simple one piece design made to attach to a string. Basic plumb bobs are also usually made in a plain geometrical shape rather than elaborately formed. A metal such as lead, steel or brass that is smooth and triangular in shape is used for many plumb bobs, but some are made of plastic. The tip at the end is always fairly sharp as it is this pointed feature on a plumb bob that indicates the perfectly straight, or plumb, vertical direction needed by builders.

Bob

Plumb Bob Laser

It is the force of gravity that makes the weighted string of the plumb bob hang completely straight so that the point can indicate the plumb vertical line. Different weights of plumb bobs are available such as 6 ounces (170 grams), 8 ounces (226.8 grams) and 12 ounces (340 grams). When a plumb bob is placed on a nail on a wall by its string, it can indicate an accurate vertical line on the wall when the weight stops moving. Coating the string with chalk can make the line appear on the wall.