흑심 BLACKHEART

Electrographic Mark Sensing Pencil

IBM announced IBM 805,

a test scoring automation machine, in 1938.

In the early 1930s, RB Johnson, a teacher, devised the machine to score students' test answers,

which IBM hired Johnson to develop IBM 805 after learning about it.

This machine makes it possible to score tests much faster and more accurately.

At that time, machines were only able to read marks of special graphite with high conductivity,

so they had to develop new pencils that machines could recognize.

So the pencil developed is IBM Electrographic.

IBM Electrographic is made of ultrafine graphite and has high conductivity,

making it easy for machines to read,

and compared to its thick and soft writing,

it is not easily worn out and thus has less powder flying.

Eagle's Electronic Scorer 350

DIXON's Sense-a-mark 2100

Pentel's MARK SHEET

With the commercialization of test scoring automation machines,

in addition to IBM Electrographics,

thick and conductive pencils for computers have been released for each brand.

These days, special graphite mixtures are not required,

and if the color is close to black, it is well recognized,

so it can be sufficiently recognized even if marked with a B or 2B pencil.

In fact, pencils are used to write answers in tests such as TOEIC and JLPT.