As the building proceeded upward, the plumb line would also be taken higher, still centered on the datum. A section of the scaffolding would hold a plumb line, which was centered over a datum mark on the floor. Until the modern age, plumb bobs were used on most tall structures to provide vertical datum lines for the building measurements. The adjective plumb developed by extension, as did the noun aplomb, from the notion of "standing upright". The plumb in plumb bob derives from Latin plumbum (' lead'), the material once used for the weighted bob at the end. Etymology A plumb rule from Cassells' Carpentry and Joinery A plumb square from Cassells' Carpentry and Joinery It is used with a variety of instruments (including levels, theodolites, and steel tapes) to set the instrument exactly over a fixed survey marker or to transcribe positions onto the ground for placing a marker. It is also used in surveying, to establish the nadir with respect to gravity of a point in space. The instrument has been used since at least the time of ancient Egypt to ensure that constructions are " plumb", or vertical. If it is used for decoration, it may be made of bone or ivory.
It is typically made of stone, wood, or lead, but can also be made of other metals. It is a precursor to the spirit level and used to establish a vertical datum. A plumb bobĪ plumb bob, plumb bob level, or plummet, is a weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical reference line, or plumb-line. For other uses, see Plumbline (disambiguation). Follow the directions for operation, care and maintenance in the operating instructions."Plumbline" redirects here.
Do not use the device where there is a risk of fire or explosion.
People passing through the laser beam or other quick changes in measuring conditions can falsify the result of measurement.Readings taken through panes of glass or similar materials can falsify the result of measurement.
#Hilti laser plumb bob full#
Before starting to use the product, always make sure that it is full working order.Do not tamper with or attempt to make alterations to the product.Have the product repaired by Hilti Service only. Laser radiation in excess of Class 2 can be emitted if the product is opened without correct procedure being followed.Do not render safety devices ineffective and do not remove information and warning notices.A moment of inattention while operating the product can result in serious personal injury. Do not use the product while you are tired or under the influence of drugs, alcohol or medication. Stay alert, watch what you are doing and use common sense when operating the product.Keep all safety instructions and other instructions for future reference.The product and its ancillary equipment can present hazards if used incorrectly by untrained personnel or if used not in accordance with the intended use. Basic information on safety In addition to the information relevant to safety given in each of the sections of these operating instructions, the following points must be strictly observed at all times.
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