![]() ![]() This plumb line is important for lining up anatomical geometries and visualizing the subject's center of balance. The device used may be purpose-made plumb lines, or simply makeshift devices made from a piece of string and a weighted object, such as a metal washer. Similar items on Etsy HUGE Sims LED Plumbob Headband / Life Size Light Up Mood Plum Bob Headwear / Sim Costume Hat / The Sims Cosplay / Halloween Comic Con. ![]() Students of figure drawing will also make use of a plumb line to find the vertical axis through the center of gravity of their subject and lay it down on paper as a point of reference. Ī plumb bob may be in a container of water (when conditions are above freezing temperatures), molasses, very viscous oils or other liquids to dampen any swinging movement, functioning as a shock absorber.ĭetermining center of gravity of an irregular shape ![]() The early skyscrapers used heavy plumb bobs, hung on wire in their elevator shafts. A variation of this tool has the plumb line hung from the top of an inverted T shape. An A-frame level with a plumb line hung from the vertex was also used to find horizontal these were used in Europe until the mid–19th century. Conventional leveling equipment is constructed to. However, if they are mounted on a suitable scale the instrument may also be used as an inclinometer to measure angles to the vertical.Īncient Egyptians used a plumb line attached to the top outer part of a tool resembling a letter E when placed against a wall, the plumb line would indicate a vertical line. This line is the direction the string of a free-hanging plumb bob takes in a still atmosphere. A plumb bob is a weight with a pointed tip on the bottom thats hung from a string, and its used to establish a vertical reference (called a plumb line). Unfortunately, Charles Jacobs passed away in 2008, but we will be using his donations in future exhibits.A plumb bob and line alone can determine only a vertical reference. I think he was somewhat amused by my interest in 20th century (i.e., his own) history, but he was willing to humor me by donating wonderful pieces like this one. ![]() He was an expert on the Civil War, but was also a font of information about local county history – both he and his wife were from old County families – and no matter what my exhibit was about, Charles could be counted on to supply some fabulous artifact, photograph or document. He worked on the first surveys for Route 240, now better known as I-270.Ĭharles Jacobs was a long-time, dedicated MCHS volunteer. Jacobs, the donor, was a “rod and chain man” (his words) for the surveying company the summer between graduating from high school and joining the Army. A 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. This is a surveyor’s plumb bob with belt sheath, used by Charles T. The rest of the summer’s schedule should allow for more timely posts. However in my own defense it has been a busy week at MCHS, with the launch of our new Montgomery Connections project ( – you know you want to visit!) and the take-down of my (our) big wedding exhibit. It’s only the third week of this blog, and already I’m running a little late with the mid-week post! That’s not a good sign. ![]()
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