Pre-Plastic Era vs. Post Plastic Era - Description
PrePlastic Era The Toothbrush Dated back as far as 3500 BC The earliest know toothbrush was made by chewing on a twig until it became soft like a brush 1600s 1800s The next invention of the toothbrush is made from bone handles and bristles made from pig hair ID: 545739 Download Presentation
Pre-Plastic Era – The Toothbrush. Dated back as far as 3500 BC. The earliest know toothbrush was made by chewing on a twig until it became soft like a brush.. 1600s – 1800s. The next invention of the toothbrush is made from bone handles and bristles made from pig hair. .
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Presentation on theme: "Pre-Plastic Era vs. Post Plastic Era"— Presentation transcript:
Pre-Plastic Era vs. Post Plastic EraSlide2
Pre-Plastic Era – The Toothbrush
Dated back as far as 3500 BC
The earliest know toothbrush was made by chewing on a twig until it became soft like a brush.
1600s – 1800s
The next invention of the toothbrush is made from bone handles and bristles made from pig hair. Slide3
Post-Plastic Era – The Toothbrush
The introduction of Nylon leads to the next tooth brush design where bristles are made of nylon, which is softer and more hygienic.
1950s - introduction to electronic toothbrushes
1980s - introduction to rotary toothbrushesSlide4
Pre-Plastic Era – The Pe
600 – 1800 AD
After paper was invented the, most common writing instrument was a quill from a bird (i.e. goose) dipped in an inkwell
Mass production of steel pen points makes quill pens obsoleteSlide5
Post-Plastic Era – The Pen
Early ballpoint pens made with colored plastic. Very expensive though
Disposable ball point pens were readily available to people. The widespread use of plastic and the development of the non-leaky ball point pen reduced costs.Slide6
Pre-Plastic Era – Eyeglasses
First eyeglasses believed to be made in Italy. They were set in bone, metal, or leather and balanced on the bridge of the nose
Eyeglasses were made of metal and glass. The stronger the prescription, the heavier the glass. Slide7
Post-Plastic Era – Eyeglasses
Widespread use of plastic replaced heavy metal frames with lighter, colorful plastic frames and the glass lens was replaced with lighter material as well, offering more comfortable designs. Of course, all metal was not eliminated because some frames are still made of metal and the hinges are made of metal. In addition, without synthetic materials, contact lenses would not exist as well.