Tuning Fork used for Resonance

Steven Gibbs says that the Hyper Dimensional Resonator works using the concept of resonance; that is it sets up a resonant field that causes you to vibrate at a certain rate. It is this resonant property of the HDR according to its inventor Steven Gibbs that makes time travel possible.

The HDR, like most other radionics devices, allows you to vary the frequency of the resonant field by turning the knobs of the black box. You will use these knobs to select what time you wish to travel to. Most of the components in the HDR are simple and easy to obtain, but it appears that the caduceus coil is what helps create the special waves that the HDR uses. These waves are similar to the sound waves produced by a tuning fork.

Above is a C512 tuning fork used to determine hearing loss. We can use this fork to study resonance and how it affects a vibration.

See a video of a tuning fork used to study resonance.

You can use a tuning fork to understand the concept of resonance and how it applies to time travel.

The phenolic rubbing plate is what allows you to tune the HDR box.

HDR rubbing plate consist of a caduceus coil made of copper wire under a surface of resin:

With the dials of your HDR allowing you to vary the frequency of the waves you should be able to achieve resonance with another period of time. Each time period has a particular harmonic at which it vibrates. You need to find this rate in order to astral time travel to that particular time period.