Take a pencil as an example.
The world's first pencil factory, the Staedtler Pencil Factory, was built in Nuremberg, Germany in 1662. Later, the German F. Castel founded the Faber Castel Graphite Pencil Factory in Nuremberg, which used sulfur, antimony, etc. as binders and heated graphite to mix lead cores, which made graphite pencil shaft manufacturing technology a big step forward. step.
France N.J. Kant first used the method of washing graphite to improve the purity of the graphite, and used clay to bond the graphite to make a pen core. This method is called the Kant method. It laid the foundation for the pencil industry.
Later, after repeated experiments, the French chemist Comte switched to using clay as a reinforcing agent. The refill made was stronger and more wear-resistant than the original one, and this method was applicable to any graphite ore until Still in use in 2019. There was a carpenter named William Monroe in the United States. He embedded a black lead core in a grooved wooden strip, and then glued the two wooden strips together to make the world's first pencil. pole.
Extended information
Pencils are always easy to write bluntly, so you need to sharpen them at this time. In the 17th century, people only used knives to sharpen pencils. With the progress of society, by the beginning of the 19th century, people not only needed to use more pencils, but also had higher requirements on the time spent sharpening pencils. The pencil sharpener based on mechanical principles was born in this environment.
The world's first such pencil sharpener was invented by a Frenchman in 1828. Over the next few centuries, the pencil sharpener gradually developed into what we are familiar with. The golden age of pencil sharpeners was probably from the mid-1980s to the early 1990s. In the early 1990s, automatic or electric pencil sharpeners appeared. Pencil sharpeners in the traditional sense have slowly withdrawn from the stage of history.
Baidu Encyclopedia-Pencil