Term: 1st Term
Week: 2
Class: Senior Secondary School 1
Age: 15 years
Duration: 40 minutes of 2 periods each
Date:
Subject: Data Processing
Topic: History of computing
SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to
INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source
INSTRUCTIONAL MATERIALS: Videos, loud speaker, pictures, Data Processing for senior Secondary Education by Hiit Plc, WAPB Computer Studies for Senior Secondary I by Adekunle et al, Online Materials.
INSTRUCTIONAL PROCEDURES
PERIOD 12
PRESENTATION 
TEACHER’S ACTIVITY 
STUDENT’S ACTIVITY 
STEP 1 INTRODUCTION 
The teacher reviews the previous lesson on the introduction to data processing 
Students pay attention 
STEP 2 EXPLANATION 
He explains the numbering system in the precomputing age and the use of the early computing devices used mentioning their inventors

Students pay attention and participates 
STEP 3 DEMONSTRATION 
He discusses further the use of the early mechanical and electronic devices also mentioning their inventors. 
Students pay attention and participate 
STEP 4 NOTE TAKING 
The teacher writes a summarized note on the board 
The students copy the note in their books 
NOTE
HISTORY OF COMPUTING
EARLY COUNTING DEVICES
In the early days of man’s existence on earth, counting and simple arithmetic were performed using different parts of the body and some other counting aids. The following are devices used by people of ancient times.
DISADVANTAGES OF EARLY COUNTING DEVICES
EARLY MECHANICAL AND ELECTRONIC DEVICES
Man has put in every effort to have better methods of calculations. As a result of
man’s search for fast and accurate calculating devices, the computer was
developed. Essentially, there are three kinds of calculating devices: manual,
mechanical and automatic.
ABACUS
The first calculating device was probably Abacus. The Chinese invented it. It is still
in use in some countries because of its simple operation. It is made up of a frame
divided into two parts by a horizontal bar and vertical threads. Each thread contains
some beads. It was used to calculate simple addition and subtraction.
NAPIER’S BONE
The need for a better calculating device was felt as time passed. John Napier, a
Scottish mathematician, invented a set of eleven rods, with four sides each which
was used as a multiplication tool. These rods were made from bones and this was
the reason why they were called Napier Bones. The rods had numbers marked in
such a way that, by placing them side by side, products and quotients of large
numbers can be obtained.
PASCALINE
The first mechanical calculating machine was invented in 1642, by Blaize
Pascal, a French mathematician. Numbers were entered by dialling a
series of numbered wheels in this machine. A sequence of wheels
transferred the movements to a dial, which showed the result.
Through addition and subtraction were performed the normal way, the
device could perform division by repeated subtraction and multiplication by
repeated addition.
LEIBNITZ CALCULATING MACHINE
Gottfried Wilhelm Von Leibnitz invented a computer that was built in 1694.
It could add and after changing some things around, it could multiply.
Leibnitz invented a special stepped gear mechanism for introducing the
added digits and this is still being used.
JACQUARD’S LOOM
Jacquard’s loom was one of the first machines that were run by a program.
Joseph Jacquard changed the weaving industry by creating a loom that
controlled the raising of the thread through punched cards. Jacquard’s
loom used lines of holes on a card to represent the weaving pattern.
PUNCHED CARD
During the years1920 and 1930, the punched card system developed
steadily. A standard card was divided into 80 columns and 12 rows. Only
one character could be represented in the 80 columns, thus providing a
maximum of 80 characters per card. Punching one, two or three holes in
any one column represented a character. Holes were punched into a blank
card by a punch machine whose keyboard resembled that of a typewriter.
NUMBER SYSTEM (REVISION)
To effectively use the computer, it is therefore necessary to know how data
is represented and communicated to. There are different ways of
representing data in the number system, namely:
EVALUATION: 1. List any four early counting devices
CLASSWORK: As in evaluation
CONCLUSION: The teacher commends the students positively