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Kaleidoscope
Kaleidoscope
History
History
Initially intended as a scientific tool, the kaleidoscope was later
Initially intended as a scientific tool, the kaleidoscope was later
Kaleidoscope operates
Kaleidoscope operates
Modern kaleidoscopes
Modern kaleidoscopes
Part containing
Part containing
Sometimes the object cell is filled
Sometimes the object cell is filled
Kinds of kaleidoscopes
Kinds of kaleidoscopes
A tetrahedron
A tetrahedron
Another cube
Another cube
Industry
Industry
Craft galleries
Craft galleries
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Слайды из презентации «Kaleidoscope» к уроку английского языка на тему «Тексты на английском»

Автор: Фурман Екатерина. Чтобы увеличить слайд, нажмите на его эскиз. Чтобы использовать презентацию на уроке, скачайте файл «Kaleidoscope.pptx» бесплатно в zip-архиве размером 1515 КБ.

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Kaleidoscope

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1 Kaleidoscope

Kaleidoscope

2 History

History

Sir David Brewster began work leading towards invention of the kaleidoscope in 1815 when he was conducting experiments on light polarization. His initial design was a tube with pairs of mirrors at one end, pairs of translucent disks at the other, and beads between the two. Initially intended as a scientific tool, the kaleidoscope was later copied as a toy. Brewster later believed he would make money from this popular invention; however, a fault in his patent application allowed others to copy his invention.

3 Initially intended as a scientific tool, the kaleidoscope was later

Initially intended as a scientific tool, the kaleidoscope was later

copied as a toy. Brewster later believed he would make money from this popular invention; however, a fault in his patent application allowed others to copy his invention.

4 Kaleidoscope operates

Kaleidoscope operates

A Kaleidoscope operates on the principle of multiple reflection, where several mirrors are together.

5 Modern kaleidoscopes

Modern kaleidoscopes

are made of brass tubes, stained glass, wood, steel, gourds or almost any material an artist can use.

6 Part containing

Part containing

The part containing objects to be viewed is called the 'object chamber' or 'object cell'.

Object cells may contain almost any material.

7 Sometimes the object cell is filled

Sometimes the object cell is filled

with a liquid so the items float and move through the object cell in response to a slight movement from the viewer.

8 Kinds of kaleidoscopes

Kinds of kaleidoscopes

A pentagonal dodecahedron

A hexahedron (cube)

A true sphere

9 A tetrahedron

A tetrahedron

An icosahedron

A spiky icosahedron

10 Another cube

Another cube

A torus

The next kaleidoscope is named "Saturn's Ring."

11 Industry

Industry

Most kaleidoscopes are mass-produced from inexpensive materials, and intended as children's toys. At the other extreme are handmade pieces that display fine craftsmanship.

12 Craft galleries

Craft galleries

often carry a few kaleidoscopes, while other enterprises specialize in them, carrying dozens of different types from different artists and craftspeople.

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