Many of the necessary tools, you probably already have in your tool chest. You may be working on a new roof, but it is more likely that you will be shingling a roof that already has a layer or two of shingles. If there is more than one layer you will need to remove the old shingles.
Electroencephalography definition, an instrument for measuring and recording the electric activity of the brain. See more.
The electroencephalogram (EEG) is a recording of the electrical activity of the brain from the scalp. The recorded waveforms reflect the cortical electrical activity. Delta: has a frequency of 3 Hz or below. It tends to be the highest in amplitude and the slowest waves.