To calculate how long the magma was stored at this boundary area, the researchers used a volcanic mineral known as spinel like a tiny stopwatch or crystal clock
Quartz crystals were first used as frequency references for radios in the early 1920s, and the first quartz crystal clock
was developed in 1928 at Bell Telephone Laboratories [1,2].
Type in "gifts for teachers" into Google and it lists hundreds of suggestions, ranging from personalised pen boxes starting at PS14.99 to mugs, pint glasses, biscuit tins and even an engraved crystal clock
- a "snip" at PS29.99.
1928 Bell Telephone Laboratories in New York State brought the development of the first quartz crystal clock
by Warren A Marrison.
Originally accurate time was provided by a Norrman crystal clock
constructed by Norrman Labs in Williams Bay, Wisconsin.
* THIS starburst crystal clock
from www.giftedpenguin.co.uk has the real wow factor.
NDK announced the availability of an environmentally friendly ultra low power-driven crystal clock
oscillator (XO), the NZ2520SF.
With Watchmen, the most memorable moment involves a blue, naked demigod having a crisis of faith while perched on a giant crystal clock
. Oh, and he's orbiting Mars at the time.
He was presented with a Waterford crystal clock
and a special model tram set.
Una and Brenda were presented with flowers and a crystal clock
She received a crystal clock
and $250 for exceptional work performance and attitude.