RESULTS FOR SEARCH Great Gifts For Teachers
Sep 21, 2023 — We Found the 45 Best Teacher Gifts After Surveying a Bunch of Educators · Amazon Gift Card, $25 at amazon.com · Personalized Teacher Stamp, $27 at ...
Apr 26, 2023 — The best teacher-approved gifts and gifts for elementary-, middle-, and high-school teachers — including a S'well water bottle, Lego sets, ...
May 8, 2023 — Our top picks ; Best self-care gift · Slip Silk Eye Mask ; Best practical gift · Blue Dragon Stationery Set ; Best gift for the classroom · Teachers ...
Apr 19, 2023 — Wondering what gifts teachers really want? Find out here! Check out this roundup of the best gifts for teachers in every price range.
Oct 21, 2022 — Best Mug for Teachers: Yeti Rambler Tumbler, $38 · Best Pen for Teachers: Rifle Paper Co. Writing Pen, $16 · Best Gift Card for Teachers: Amazon ...
Aug 10, 2023 — In This Article · Noted by Post-it Premium Gift Box Set · Main + Mesa Marble Geometric Bookends · Fellow Carter Move Mug · Reliancer Colorful Stamp ...
Apr 28, 2023 — The Best Gifts For Teachers. A Heartfelt Candle. A lit Coffee & Motivation Teaching Is A Work Of Heart Candle.
Apr 5, 2023 — The 31 Best Gifts for Teachers · Room upgrades · A rarer roast · Higher-level hydration · A custom gift card · A classroom personalizer · The Sound of ...
46 Best Teacher Gifts Of 2023, Hand-Picked By Educators Who Love The Classroom · iWenSheng Teacher Appreciation Keychain · iWenSheng Teacher Appreciation Keychain.
Nov 1, 2022 — The 55 best gifts for teachers, from handy gadgets to tokens of appreciation · A set of teacher affirmation cards · A mini Crock-Pot to warm their ...
1. The pencil sharpener that all the teachers are talking about · 2. Everyone loves a good book · 3. Personalized pencils · 4. Gift cards · 5. Their go-to grading ...
May 10, 2023 — 38 thoughtful gifts for the teachers in your life (that aren't an apple) · Best teacher appreciation gifts to shop · Pencil Bath Bomb · Adhesive ...
Gifts for Teachers: What they REALLY Want · Candy. Teachers receive a lot of chocolate and other candy this time of year — it's just too much, they say. · Mugs.
Sep 13, 2023 — The Best Teacher Gifts, According to Some Very Honest Teachers · Clever Fox Planner · Paper Mate InkJoy Gel Pens · Amazon Gift Card · Theory5Designs ...
Jun 26, 2023 — 26 Gifts for Teachers Who Seriously Deserve a Big Thank-You · BAGGU Cloud Bag · BAGGU Cloud Bag · Teacher Education Equality Beaded Bracelet.
15 of the Best Cheap Teacher Gift Ideas · 1. Hands Down Soap Gift from Eighteen25 Simple, useful and cute! · 2. Pop Quiz Gift from Pink Peppermint Design · 3. Tote ...
Apr 19, 2023 — Flowers, lemons from their own tree, and a trader's gift card. Really anything not chocolate because that's so common. I love stuff the kids ...
Aug 24, 2023 — 51 Best Gifts for Teachers That They'll Genuinely Love ; 'Things my Students Said' Teacher's Journal. 'Things my Students Said' Teacher's Journal.
Jan 12, 2023 — The #1 best teacher gift is a letter. I don't know any teacher in the world who doesn't appreciate a note of appreciation that describes ...
gear
A gear is a rotating circular machine part having cut teeth or, in the case of a cogwheel or gearwheel, inserted teeth (called cogs), which mesh with another (compatible) toothed part to transmit (convert) torque and speed. The basic principle behind the operation of gears is analogous to the basic principle of levers. A gear may also be known informally as a cog. Geared devices can change the speed, torque, and direction of a power source. Gears of different sizes produce a change in torque, creating a mechanical advantage, through their gear ratio, and thus may be considered a simple machine. The rotational speeds, and the torques, of two meshing gears differ in proportion to their diameters. The teeth on the two meshing gears all have the same shape.
Two or more meshing gears, working in a sequence, are called a gear train or a transmission. The gears in a transmission are analogous to the wheels in a crossed, belt pulley system. An advantage of gears is that the teeth of a gear prevent slippage. In transmissions with multiple gear ratios—such as bicycles, motorcycles, and cars—the term "gear" (e.g., "first gear") refers to a gear ratio rather than an actual physical gear. The term describes similar devices, even when the gear ratio is continuous rather than discrete, or when the device does not actually contain gears, as in a continuously variable transmission (CVT). Sometimes a CVT is referred to as an "infinitely variable transmission".
Furthermore, a gear can mesh with a linear toothed part, called a rack, producing movement in a straight line instead of rotation (movement in a circle). See Rack and Pinion for an example.
History[edit]The earliest examples of gears date from the 4th century BC in China (Zhan Guo times – Late East Zhou dynasty), which have been preserved at the Luoyang Museum of Henan Province, China. The earliest preserved gears in Europe were found in the Antikythera mechanism an example of a very early and intricate geared device, designed to calculate astronomical positions. Its time of construction is now estimated between 150 and 100 BC. Gears appear in works connected to Hero of Alexandria, in Roman Egypt circa AD 50, but can be traced back to the mechanics of the Library of Alexandria in 3rd-century BC Ptolemaic Egypt, and were greatly developed by the Greek polymath Archimedes (287–212 BC).
A complex geared calendrical device showing the phase of the Moon, the day of the month and the places of the Sun and the Moon in the Zodiac was invented in the Byzantine empire in the early 6th century AD. The worm gear was invented in the Indian subcontinent, for use in roller cotton gins, some time during the 13th–14th centuries. Differential gears may have been used in some of the Chinese south-pointing chariots, but the first verifiable use of differential gears was by the British clock maker Joseph Williamson in 1720.
Examples of early gear applications include:
1386 AD: The Salisbury Cathedral clock: it is the world's o
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