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 multichannel tracing on paper of the output of the ELECTROENCEPHALOGRAPH, representing the electrical activity of the brain as occurring between pairs of electrodes in contact with the scalp and representing the algebraic sum of an immense amount of underlying electrical activity.