Technetium’s Slide Rule Geocoin (Antique Bronze) - Evening in Bronze Edition

The Circular Slide Rule geocoin is the personal geocoin of the Dutch geocacher technetium, who designed this geocoin together with Chuck Turner from Palehorse Design (PHDCoins.ca). They have made a functional geocoin, which can be used for math operations like multiply or divide as well as for sinus or cosine calculations.

For example: Align number 1 from the outer circle with the number 3 from the inner circle. The number 12 from the inner circle will now align with number 4 from the outer circle (12 is the product of 4 cross 3). The number 1.67 at the outer circle can also be regarded as number 16.67, number 166.67, etc. This will give you number 5, number 50, number 500 and so on. Because the numbers on the circular slide rule are alinged in a circle this will continue ad infinitum

The center of the geocoin contains a fractal (a Sierpiński's triangle), which describes an infinite repetition like the numbers on the circular slide rule. The largest triangle of the Sierpiński's triangle contains the electron configuration scheme of the chemical element technetium. Technetium is the element with the lowest atomic number in the periodic table that has no stable isotopes: every form of this element is radioactive. Therefore the other triangles are empty or shows x-rays of the decayed element.

Design

The coin has a diameter of 50 mm (2") and a thickness of 5 mm (1/5"). A small rotating disc is located in the middle of the geocoin. I.e. the geocoin is a functional circular slide rule and can be used for math operations like multiply or divide. Including a trigonometric scale, it can also be used for trigonometry calculation of sinus, cosine, etc. The tracing code is placed on the edge.

On the back of the geocoin a Smith chart is shown. The Smith chart, invented by Phillip H. Smith (1905–1987), is a graphical aid or nomogram designed for electrical and electronics engineers specializing in radio frequency (RF) engineering to assist in solving problems with transmission lines and matching circuits.

In total five finishings were minted:

• Technetium’s Slide Rule Geocoin (Polished Gold) - Morning in Gold Edition
• Technetium’s Slide Rule Geocoin (Antique Bronze) - Evening in Bronze Edition
• Technetium’s Slide Rule Geocoin (Polished Silver) - Night in Silver Edition
• Technetium’s Slide Rule Geocoin (Satin Gold/Satin Silver) - Special Edition
• Technetium’s Slide Rule Geocoin (Polished Nickel) - Artist Edition

Technetium’s Slide Rule Geocoin (Antique Bronze) - Evening in Bronze Edition

The Technetium’s Slide Rule Geocoin is one of the geocoins I have retrieved out of the JackHoe collection! I really appreciate the opportunity to get a part of his stunning dutch geocoin collection

The aim of this geocoin is to please everyone who looks at this beautiful geocoin and discovered it