Hi All, Have you ever scraped the wall wheel taking a secured painting on or off the wall? Then you have to clean or touch up the wall to make it look good again, right? No more, this is a quick little solution to improve your security tool. Simply wrap the tool with 2″ blue tape, the metal will no longer scuff the wall and the tape is just a bit slick so it will glide smoothly. We use 2″ tape because it has more coverage, two pieces of 1″ tape runs the risk of overlapping and creating a bulky bump, that wouldn’t be the end of the world, but hey we want the best we can get and we don’t always have a lot of time to get it. You may want to just wrap one around so the tape it as thin as possible so you can get into those tight spaces. Pictured here you’ll see we ended up going twice around. We’d probably change that, but for now we’ll leave well enough alone until it needs to get changed out. Additionally, you will of course want to keep the back side über smooth, you’ll notice a small wrinkle on the backside of this one. It should be fine and will burnish down with use, but do what you can to keep it flat flat flat.
This guys is true craftsman. There must be 100 videos about this kind of work, but this one is simple and to the point and inspired me to think outside the, box. Think curves and this is a way to get it down. Go forth and create! Have you used a similar technique, we’d love to read about your tips and tricks to achieving similar results. Go to the Trade Yours page and share it with all of us today!
HI All, Just a quick link to a fantastic resource. If you’re looking for second-hand supplies the Public Surplus page could be your ticket. We all have tight budgets, this is your ticket to getting what you need. You can change the “region” to your state. Take note that in most cases you’ll need to go in person to pick up your item and you can’t refine your search my city or county. Have fun, happy hunting! SaveSave
Also know as Lichtenberg Figures this process dates back quite a while. I think it would be a nice technique in a natural history museum, children’s museum, or science museum not only for its science, but also for its beauty. Are any of you using this technique in some capacity? Here is the Wikipedia entry: Lichtenberg figures (German Lichtenberg-Figuren), or “Lichtenberg dust figures”, are branching electric discharges that sometimes appear on the surface or in the interior of insulating materials. Lichtenberg figures are often associated with the progressive deterioration of high voltage components and equipment. The study of planar Lichtenberg figures along insulating surfaces and 3D electrical trees within insulating materials often provides engineers with valuable insights for improving the long-term reliability of high voltage equipment. Lichtenberg figures are now known to occur on or within solids, liquids, and gases during electrical breakdown. History Lichtenberg figures are named after the German physicist Georg Christoph Lichtenberg, who originally discovered and studied them. When they were first discovered, it was thought that their characteristic shapes might help to reveal the nature of positive and negative electric “fluids”. In 1777, Lichtenberg built a large electrophorus to generate high voltage static electricity through induction. After discharging a high voltage point to the surface of an insulator, he recorded the resulting radial patterns by sprinkling various powdered materials onto the surface. By then pressing blank sheets of paper onto these patterns, Lichtenberg was able to transfer and record these images, thereby discovering the basic principle of modern xerography. This discovery was also the forerunner of the modern-day science of plasma physics. Although Lichtenberg only studied two-dimensional (2D) figures, modern high voltage researchers study 2D and 3D figures (electrical trees) on, and within, insulating materials. Lichtenberg figures are now known to be examples of fractals. Formation Two-dimensional (2D) Lichtenberg figures can be produced by placing a sharp-pointed needle perpendicular to the surface of a non-conducting plate, such as of resin, ebonite, or glass. The point is positioned very near or contacting the plate. A source of high voltage, such as a Leyden jar (a type of capacitor) or a static electricity generator, is applied to the needle, typically through a spark gap. This creates a sudden, small electrical discharge along the surface of the plate. This deposits stranded areas of charge onto the surface of the plate. These electrified areas are then tested by sprinkling a mixture of powdered flowers of sulfur and red lead (Pb3O4 or lead tetroxide) onto the plate. During handling, powdered sulfur tends to acquire a slight negative charge, while red lead tends to acquire a slight positive charge. The negatively electrified sulfur is attracted to the positively electrified areas of the plate, while the positively electrified red lead is attracted to the negatively electrified areas. In addition to the distribution of colors thereby produced, there is also a marked difference in the form of the figure, according to the polarity of the electrical charge that was applied to the plate. If the charge areas were positive, a widely extending patch is seen on the plate, consisting of a dense nucleus, from which branches radiate in all directions. Negatively charged areas are considerably smaller and have a sharp circular or fan-like boundary entirely devoid of branches. Heinrich Rudolf Hertz employed Lichtenberg dust figures in his seminal work proving Maxwell’s electromagnetic wave theories. Carbonized high-voltage discharge tracks cross the surface of a polycarbonate sheet If the plate receives a mixture of positive and negative charges as, for example, from an induction coil, a mixed figure results, consisting of a large red central nucleus, corresponding to the negative charge, surrounded by yellow rays, corresponding to the positive charge. The difference between positive and negative figures seems to depend on the presence of air; for the difference tends to disappear when the experiment is conducted in vacuum. Peter T. Riess (a 19th-century researcher) theorized that the negative electrification of the plate was caused by the friction of the water vapour, etc., driven along the surface by the explosion which accompanies the disruptive discharge at the point. This electrification would favor the spread of a positive, but hinder that of a negative discharge. It is now known that electrical charges are transferred to the insulator’s surface through small spark discharges that occur along the boundary between the gas and insulator surface. Once transferred to the insulator, these excess charges become temporarily stranded. The shapes of the resulting charge distributions reflect the shape of the spark discharges which, in turn, depend on the high voltage polarity and pressure of the gas. Using a higher applied voltage will generate larger diameter and more branched figures. It is now known that positive Lichtenberg figures have longer, branching structures because long sparks within air can more easily form and propagate from positively charged high voltage terminals. This property has been used to measure the transient voltage polarity and magnitude of lightning surges on electrical power lines. Another type of 2D Lichtenberg figure can be created when an insulating surface becomes contaminated with semiconducting material. When a high voltage is applied across the surface, leakage currents may cause localized heating and progressive degradation and charring of the underlying material. Over time, branching, tree-like carbonized patterns are formed upon the surface of the insulator called electrical trees. This degradation process is called tracking. If the conductive paths ultimately bridge the insulating space, the result is catastrophic failure of the insulating material. Some artists purposely apply salt water to the surface of wood or cardboard and then apply a high voltage across the surface to generate complex carbonized 2D Lichtenberg figures on the surface. Fractal similarities The branching, self-similar patterns observed in Lichtenberg figures exhibit fractal properties. Lichtenberg figures often develop during the dielectric breakdown of solids, liquids, and even gases. Their appearance and growth appear to be related to a process called diffusion-limited aggregation (DLA). A useful macroscopic model that combines an electric field with DLA was developed by Niemeyer, Pietronero, and Weismann in 1984, and is known as the dielectric breakdown model (DBM). Although the electrical breakdown mechanisms of air and PMMA plastic are considerably different, the branching discharges turn out to be related. So, it should not be surprising that the branching forms taken by natural lightning also have fractal characteristics. Natural occurrences Lightning is a naturally occurring 3-dimensional Lichtenberg figure Lichtenberg figures may also appear on the skin of lightning strike victims. These are reddish, fern like patterns that may persist for hours or days. They are also a useful indicator for medical examiners when determining the cause of death. Lichtenberg figures appearing on people are sometimes called lightning flowers, and they are thought to be caused by the rupture of capillaries under the skin due to the passage of the lightning current or the shock wave from the lightning discharge as it flashes over the skin. A lightning strike can also create a large Lichtenberg figure in grass surrounding the point struck. These are sometimes found on golf courses or in grassy meadows. Branching root-shaped “fulgurite” mineral deposits may also be created as sand and soil is fused into glassy tubes by the intense heat of the current. Electrical treeing often occurs in high-voltage equipment prior to causing complete breakdown. Following these Lichtenberg figures within the insulation during post-accident investigation of an insulation failure can be useful in finding the cause of breakdown. An experienced high-voltage engineer can see from the direction and the shape of trees and their branches where the primary cause of the breakdown was situated and possibly find the initial cause. Broken-down transformers, high-voltage cables, bushings and other equipment can usefully be investigated in this manner. The insulation is unrolled (in the case of paper insulation) or sliced in thin slices (in the case of solid insulating materials). The results are then sketched or photographed to create a record of the breakdown process. In insulating materials Modern Lichtenberg figures can also be created within solid insulating materials, such as acrylic (polymethyl methacrylate or PMMA) or glass by injecting them with a beam of high-speed electrons from a linear electron beam accelerator (or Linac, a type of particle accelerator). Inside the Linac, electrons are focused and accelerated to form a beam of high-speed particles. Electrons emerging from the accelerator have energies up to 25MeV and are moving at an appreciable fraction (95 – 99+ percent) of the speed of light (relativistic velocities). If the electron beam is aimed towards a thick acrylic specimen, the electrons easily penetrate the surface of the acrylic, rapidly decelerating as they collide with molecules inside the plastic, finally coming to rest deep inside the specimen. Since acrylic is an excellent electrical insulator, these electrons become temporarily trapped within the specimen, forming a plane of excess negative charge. Under continued irradiation, the amount of trapped charge builds, until the effective voltage inside the specimen reaches millions of volts. Once the electrical stress exceeds the dielectric strength of the plastic, some portions suddenly become conductive in a process called dielectric breakdown. During breakdown, branching tree or fern-like conductive channels rapidly form and propagate through the plastic, allowing the trapped charge to suddenly rush out in a miniature lightning-like flash and bang. Breakdown of a charged specimen may also be manually triggered by poking the plastic with a pointed conductive object to create a point of excessive voltage stress. During the discharge, the powerful electric sparks leave thousands of branching chains of fractures behind – creating a permanent Lichtenberg figure inside the specimen. Although the internal charge within the specimen is negative, the discharge is initiated from the positively charged exterior surfaces of the specimen, so that the resulting discharge creates a positive Lichtenberg figure. These objects are sometimes called electron trees, beam trees, or lightning trees. As the electrons rapidly decelerate inside the acrylic, they also generate powerful X-rays. Residual electrons and X-rays darken the acrylic by introducing defects (color centers) in a process called solarization. Solarization initially turns acrylic specimens a lime green color which then changes to an amber color after the specimen has been discharged. The color usually fades over time, and gentle heating, combined with oxygen, accelerates the fading process. On wood Lichtenberg figures can also be produced on wood. The types of wood and grain patterns affect the shape of the Lichtenberg Figure produced. SaveSave SaveSave
We came across Playfullearning.net the other day and want to share them with you, they have a plethora of resources for all museum types. We’ve organized and curated their content into areas of MuseumTrade, but we encourage you to take a visit for yourself. Please let us know if you find a post there that the MuseumTrade community would enjoy. WATER IS WATER Confession number one, I am a sucker for the water cycle. I’m not sure what exactly entices me about this scientific phenomenon, perhaps because it is something children can see so readily in their own world, but it is something I have always loved teaching. Confession number two, I am even more entranced by picture books. A person’s age does not matter when it comes to picture books. They draw you in with their illustrations, and capture you with their words. Picture books are a simple, beautiful way to teach so many lessons, concrete and abstract. So, when I stumbled upon a new picture book about the water cycle, I may have done a little happy dance. Water is Water by Miranda Paul uses short rhyming verse to follow water through phases throughout the seasons, states of matter, and the water cycle. The lovely illustrations by Jason Chin are a perfect accompaniment to the story. The icing on the cake is what follows the story, “More About Water”! The author provides a scientific background to each page of the story sprinkling in important vocabulary words. As it says in the book, “Water moves and changes often – just like children!” The water cycle is a perfect scientific learning opportunity for some playful, active learning. Through the following three easy experiments, you can use a cup of water to show evaporation, condensation, and precipitation. These may be simple experiments, but connecting literature, science, and hands on discovery often gives a more concrete understanding of new concepts. Use the printable to help children delve deeper into their understanding through these connections. You will only need a few readily available materials to complete all of these experiments: Four cups Water Marker Ice cube Shaving cream Food coloring Start with evaporation. Place a full cup of water in front of a sunny window. Use a marker to make a line at the beginning water level. Each hour mark the water level and begin to look for changes. As the sun heats the water, it should begin to evaporate. This experiment requires some patience, so while waiting, it is a great time to move on to the next two experiments. After evaporation we have condensation. When the water vapor reaches the sky it cools to form clouds. Fill a cup approximately two-thirds full of hot water. Take another cup, flip it upside down, and place it on top of the cup with hot water. Then place an ice cube on top of the upside down cup. Condensation will begin to form at the top of the upside down cup, just like a cloud. Finally, a precipitation experiment. Again, fill a cup almost full with water. On top spray shaving cream as clouds. Then, squirt several drops of food coloring on top of the shaving cream. As the “cloud” becomes heavy, the food coloring will “rain” into the cup. Once you have read the book and completed all three experiments, use the printable to help children make the connections between the book, what they see in their own lives, and what they viewed in the experiments (click on photo below to print). If you are looking to extend your activities, there are abundant resources in books and online covering the water cycle. Here are a website, an app, and a video all about the water cycle. You may just find yourself as hooked on the water cycle as I am! EPA’s Water Cycle Website Water Cycle App
Because sometimes you just need to nerd out! We bring you some of the best MuseumTrade worthy Instagram feeds. Admittedly these tend to be art museum focused, but we’d like to round this out with feeds from all museum types. Please add a comment if you follow a user or hashtag not found here. Enjoy. @Museum Trade #ArtHandler #PreparatorLife #ArtTechnician @GirlPreparator @RogueRegistrar @ConradPrimo @ArtHandling @Art_Handler #MuseumTechnician #MuseumTechnicianLife & MuseumTechnicianPerspective #SketchbookPrado MountmakingFocus #Mountmaking #Artpacking The Art of Installation Crazy Art Handler Preparators of Instagram Secret Life of Art Handling Museum Work Musée de la Logistique Installator Art Tech Space Art Handling 101 Art Handling Life Art Technician(s) Art Handling Art Art Technicians Miro Hamar (hømage to prep work)
We found this on Fellers.com, but we’re guessing other places sell this as well. If you’re looking to install graphics that will last for some time, you might want to look into a test kit like this. It’s better to take a little extra time to get it right instead of spending thousands of dollars shortly down the road when you learn you installed the wrong material. In addition, the attached Product Bulletin PDF has a lot of nice Pro Tips for installing on various wall surfaces. ADHESION TEST KIT FOR SMOOTH WALLS PRODUCT DETAILS This kit includes all the tools needed to perform a successful adhesion test to determine the best material for the surface Kit includes 7 different test films with color coded cores for easy identification, Ohaus Spring Scale, 3M RBA-1 Rivet brush, Hole Punch, scissors and adhesion test instructions Please refer to 3M Wall Product Bulletin (below) for full details 3M Adhesion Test Kit Procedure 3M Measured Reference Guide 3M Wall Product Bulletin 2017
I can’t say that I take it this far at home, but I surely relate to the look in the eyes of Flammy and Chip. Enjoy you preparator nerds!
You can spray paint the message all you want, but you’ll never know, with one hundred percent certainty, that others will respect your message of DO NOT STACK. So what can you do, here’s one simple solution. Pretty obvious, but hey, sometimes something simple is all you need. Happy crating to all of you. A bonus Image we came across, hopefully none of this was destined to any of you: