Light aircraft often use a heading indicator as a way to know where they’re going. Retired instrumentation engineer [Don ...

Magnetic devices are components for creating, manipulating or detecting magnetic fields. This can include magnetic memories, magnetometers and devices for magneto-optics. Magnetism can also play a ...

Optical sensors are a broad class of device for detecting light intensity. This can be just a simple component for notifying when ambient light levels rise above or fall below a prescribed level, or a ...

Telescopes are fun to point around the sky, but they’re even better when you have some idea of what you’re actually looking at. Experienced sky-gazers love nothing more than whipping out some quality ...