Alleluia - the Greek form (Rev. 19:1, 3, 4, 6) of the HebrewHallelujah[?] =
Praise ye Jehovah, which begins or ends several of the psalms
(106, 111, 112, 113, etc.).
... of this device looks confusing at first sight, but is surprisingly simple. It can easily be understood with a little knowledge of gyroscopes. Their striking property is ...