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In 1776, scientist Joseph Priestley noted, "I have seen a substance excellently adapted to the purpose of wiping from paper the mark of black lead pencil." Also in 1770, Edward Naime, an English engineer, is credited with creating the first rubber eraser, and reportedly sold natural rubber erasers for the high price of 3 shillings per half-inch cube. According to Naime, he inadvertently picked up a piece of rubber instead of breadcrumbs, discovered rubber's erasing properties, and began selling rubber erasers. Incidentally, this was the first practical application of the substance in Europe, and rubbing out the pencil marks gave it its English name. The first patent for attaching an eraser to a pencil was issued in 1858 to a man from Philadelphia named Hyman Lipman. This patent was later held to be invalid because it was merely the combination of two things, without a new use.
What else can I help you with?
What is 25 pencils out of 20 erasers ratio?
25 pencils out of 20 erasers ratio can be written as : 5 : 4.
You have 10 different pencils and 8 different erasers How many different pairs of pencils and erasers are possible?
2268 possibl3
If i had 184 pencils and 207 erasers what is the greatest number of kids getting both erasers and pencils?
If you only have 184 pencils then only 184 kids will get both a pencil and an eraser, even if you have more erasers than that.
What is the smallest number of pencils and erasers you can buy so that you will have the same number of each we have 12 pencils in a package and 10 erasers in a package?
To find the smallest number of pencils and erasers that you can buy to have the same quantity of each, you need to determine the least common multiple (LCM) of the package sizes. The LCM of 12 (pencils) and 10 (erasers) is 60. Therefore, you would need to buy 5 packages of pencils (5 x 12 = 60 pencils) and 6 packages of erasers (6 x 10 = 60 erasers) to have an equal number of both, totaling 11 packages.
In 1765 Eberhard added what to pencils?
erasers
Do Bic mechanical pencils have latex free erasers?
Yep.
Matthew has 8 pencils Three of them do not have erasers on the end Whatfraction of pencils do not have eraser on the end?
3/8
A stationary means?
Pencils, Pens, Highlighters, Erasers, Paperclips, Notebooks etc.
How do you put erasers on mechanical pencils?
take the cap off and put the eraser in
What should a 6th grader have for school supplies?
Writing pencils. Colored pencils. Ruler. School Bag. Pencil Bag. Erasers. Etc.
What is made of plastic?
Plastic erasers, plastic bags, parts of projecting pencils{sometimes}...
Why do pencils and erasers wear out?
because they r made out of wood and wood wears out ...........................................i think?
