0
Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or locanic ash.
Other usesBecause it is a good electrical insulator and fireproof, it was used to construct early 20th century electric switchboards and relay controls for large electric motors. Fine slate can also be used as a whetstone to hone knives.Due to its thermal stability and chemical inertness, slate has been used for laboratory bench tops and for billiard table tops. In 18th and 19th century schools, slate was extensively used for blackboards and individual writing slates for which slate or chalk pencils were used.
In areas where it is available, high-quality slate is used for gravestones and commemorative tablets, and by artists in various genres.
The finest slates come from Portugal, Scotland, and NY, USA
Most modern black boards are instead made of wooden particle board to which a black paint like coating is applied. This is less expensive and lighter allowing larger boards to be made.
Wiki User
∙ 10y ago
Add your answer:
Earn +20 pts
What is the origin and meaning of a mortarboard?
Mortar boards were so named because of their resemblance to the mortar boards used by masons (stone and brick workers). Mortar boards are flat, square boards used by masons to carry around their mortar.
Why do board called as blackboard even its color is green?
Originally the boards were made of slate which is a black stone. They were eventually replaced by wooden boards painted green but the name still stuck.
Differences of white boards and black boards?
White boards use Dry Erase Markers. Black boards use Chalk.
What is the dusk stone used on in Pokemon black?
The Dusk Stone is an evolution-inducing stone which can be used on Murkrow, Misdreavus and Lampent.
Which rock is used in making a black board?
It used to be slate, but most modern black boards are wood particle board with a black paint like coating applied. This is cheaper and lighter as well as making bigger boards possible.
Other than brick or stone what surfaces can masonry paint be used on?
It can be used on concrete or many of the modern fake concrete boards like Hardibacker.
What is the black cloth that used to cover the stone square of Hajj?
KAaba
What kind of rock was used to build the white house?
Black stone
How long do chopping boards last?
There are many materials used in making lightweight cutting boards. Some popular materials include plastic, silicone and bamboo. Additional materials may include oak, or glass.
What is boards used for?
To make plaster boards
Which rock is used to make cheese boards and chess set?
The answer to your question is : marble :P
Does the Kaaba have a stone from heaven?
Yes it does. It's called the 'Black Stone' When it first came from heaven it used to be white, but over time it absorbed sins and it turned Black.
