Hourglass An hourglass (sandglass, sand timer, sand clock, egg timer) measures the passage of a few minutes or an hour of time. It has two connected vertical glass bulbs allowing a regulated trickle of material from the top to the bottom. Once the top bulb is empty, it can be inverted to begin timing again. The name hourglass comes from historically common hour timing. Factors affecting the time measured include the amount of sand, the bulb size, the neck width, and the sand quality. Alternatives to sand are powdered eggshell and powdered marble (sources disagree on the best material). Modernly, hourglasses are ornamental or used when an approximate measure suffices, as in egg timers for cooking or for board games.Author: Claudia Gray Download "Hourglass" from Google Books Hourglass. The third heart-pounding page-turner in the best-selling Evernight series follows Bianca, the teenage daughter of vampire parents who has both bloodthirsty and human qualities, and her mortal beloved, Lucas, to Manhattan, a “city with a serious vampire problem.” Posing as a member of the vampire-hunting group Black Cross, to which Lucas belongs, Bianca continues to take part in the war between humans and vampires, which rages everywhere from elegant apartments to Central Park. Once again, Gray balances the tense, relentless action with passionate romance all the way to the shocking conclusion, which will leave readers demanding the next installment. A natural for Twilight series fans. Grades 9-12. |
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