Practice

James Pillan, Headmaster of the old high school of Edinburgh, Scotland, is widely credited for inventing the blackboard and colored chalk which he used to teach geography. 

It was not long after 1801 that the blackboard was introduced into the American educational system from
Europe.Immediately becoming one of the most popular and widely used teaching tool across America it forever changed the relationship between students and teachers.

September 21st, 1801 The first wall mounted blackboard was used at West Point Military Academy, By George Baron an English Mathematician.  

The blackboard changed education forever

Just like that the classroom became a place equipped to ensure that all students were educated bringing together a very diverse group of students with a wide variety of learning styles, experiences, intelligence, and goals.Placing the responsibility of the individual student to learn through open dialogue between teacher and student, group discussions, opportunity to work problems out on the board.
The Blackboard used face-to-face in a classroom setting along with spoken lecture.        
The chalkboard created a effective learning strategies by providing written information in front of the class visually.

Considered the most influential educational technology of all time the blackboard played a powerful role in learning environments that are safe, positive, and nurturing.

Appealing to students visual learning style

Inexpensive (reliable no lose of power, broken light bulbs)

Allowing students to go at their own pace 

Ability to educate more students at once 

Allowed for flexibility and spontaneity

All students have certain needs that must be met if they are going to grow and learn. I feel that the blackboard changed our classroom environment forever meeting  students needs:

Social

The classroom environment has to ensure students feel comfortable with themselves, with each other, and with the teacher.

Emotional
The classroom environment needs to be supportive of the physical requirements for the learning process to be effective fostering intellectual freedom and encouraging experimentation and creativity.

Intellectual

The classroom environment has to ensure students are actively engaged in learning and they need to feel free to take risk. A environment where students and teachers interact and dialogue, where students try out new ideas in the workplace, where exercises and experiences are used

Physical

The classroom environment has to ensure teachers and students are treated with respect, dignity, who's opinions are heard and valued.