The parts arrived for the RPM meter that uses an Arduino and reciprocal counting to get a three-times-a-second update rate with 1rpm resolution. Arduinos plus ready-made modules are a very qick route ...

Highlights: RPM Hole 4 Extends Mineralization: Visible, awaruite (nickel-iron alloy) was identified throughout the entire length of the 402 meter hole. 400m Step-Out: Located 400 meters north of ...