There's a great little book, "Mind Machines You Can Build", by G. Harry Stine
that has a device similar to the pyramid device you mention plus many others.
The Book description reads, "A collection of instructions for a fascinating
array of "psychotronic" and dowsing tools. Speed or retard reactions; find
water or lost objects; move physical objects with mental energy." Paperback.
208pgs. $15.95.
You can find it at: www.tools4explore.com
Regards. JCS