The Robertson can do flips if you hold it JUST right.įourth, it is unique in its skeletonized design.You can change between strong and weak just by moving one slider to the back or front and using the other side magnets. The magnet depths are set differently on the two sides so there is a strong side and a weak side.Third, the exposed magnets on both sides enables two things: I’m not sure how many barleycorns that is. If you prefer older measurement systems, it’s less than half an inch thick. At 11mm, it’s less than ⅔ the thickness of the Lowrey. So little brass is touching during sliding and rotation that it feels like a precision bearing. In fact, you could make it bold and throw in an extra “O” and that still doesn’t capture how smooth it was. As soon as I tried the first one I knew I had stumbled onto something unique and enjoyable.įirst, it was smooth. But before I abandoned the machining setup, I decided to try something totally different: A fidget slider with exposed magnets on both sides for symmetrical functionality. The Robertson is the result of a long design and redesign process that ran into a dead end. So we’ll just rely on word of mouth when your friends ask you “Where did you get that!?” We know you’re good for it. The only mark is a subtle “+” to indicate the strong side of the slider. I decided that the overall design is so delightfully minimalistic that I didn’t want to put our logo on it. Shop 3.75 X 1 size, durable and shatterproof brass smoking magnetic pipe with a metal hand pipe, a magnetic lid and an integrated screen-less filter. Sliding surfaces will initially have toolmarks but over time they will self-burnish into an even smoother sliding surface. 25mm from the top surface for the strong side of the magnets using purpose-built jigs and fixtures. The final magnet depth is set to precisely. The magnet bores are held to very tight tolerances to provide a secure press fit without any adhesives. The one piece body is CNC machined from a single piece of brass. Symmetrical design allows for flipping one slider on top of another.Unique double-sided slider for two different magnet strengths.Dimensions: 0.47 inches wide at its widest point x 1.The Bruce Charles Designs Robertson magnetic slider introduces a totally new and unique slider for your enjoyment.Also handy for science experiments and demonstrations involving ferromagnetism.Hanging keys, notes, pictures, blueprints, etc.Generally, the magnet test is only the first test performed, before density and acid testing. Identify fake/plated jewelry, which often has steel or nickel alloys as the base material (some alloys, like nickel-silver and German silver are non-magnetic, despite having ferrous metals present).Identify and sort solid brass and bronze from steel-plated items (handy in the antique market and hardware store).Identify/sort chrome plated items from polished aluminum, silver, and non-magnetic grades of stainless steel (chrome plating requires a nickel layer, which is magnetic).Identifying most steel grades and metal alloys that contain iron, nickel, or cobalt.The magnet can also be used to determine polished aluminum from stainless steel in most cases, and is very handy for testing industrial metals for recycling.Ī powerful 12mm N35 grade (~2 bs pull strength) neodymium rare earth magnet is encased in an aluminum housing for durability and comes with a stainless steel split ring.
The same is also true of brass and bronze antiques, many are just brass plating over steel or iron. If a magnet responds to jewelry, it is not fine silver or anything near pure gold.
It is perfect for jewelers, recyclers, coin dealers, or anyone that needs to make fast assessments of jewelry, antiques, and industrial metals for iron, nickel, or cobalt content.ĭetermine if jewelry is silver or gold plated by testing if ferrous metals are used as the base metal (excluding some nickel alloys). This 12mm keychain magnet offers strong magnet power in a handy keychain.
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