Electro-mechanical Counting Devices (Continues)
Subject:
Computer Studies (ICT)
Term:
First Term
Week:
Week 4
Class:
JSS 1 / BASIC 7
Previous lesson: Pupils have previous knowledge of
ELECTRO-MECHANICAL COUNTING DEVICES
that was taught in their previous lesson
Topic:
Electro-mechanical Counting Devices (Continues)
Behavioural objectives: At the end of the lesson, the pupils should be able to
Instructional Materials:
- Wall charts
- Pictures
- Related Online Video
- Flash Cards
Methods of Teaching:
- Class Discussion
- Group Discussion
- Asking Questions
- Explanation
- Role Modelling
- Role Delegation
Reference Materials:
- Scheme of Work
- Online Information
- Textbooks
- Workbooks
- 9 Year Basic Education Curriculum
- Workbooks
Content
JOSEPH JACQUARD’S LOOM
The Jacquard machine is a device fitted to a power loom that simplifies the process of manufacturing textiles with such complex patterns as brocade, damask and matelassé. It was invented by Joseph Marie Jacquard in 1804. The loom was controlled by a chain of cards, a number of punched cards, laced together into a continuous sequence. Multiple rows of holes were punched on each card, with one complete card corresponding to one row of the design. The Jacquard loom was the first machine to use punch cards to control a sequence of operations.
CHARLES BABBAGE’S MACHINES
Charles Babbage (26 December 1791 – 18 October 1871) was an English polymath, a mathematician, philosopher, inventor and mechanical engineer. Babbage originated the concept of a digital programmable computer. Babbage is credited with inventing the first mechanical computer that eventually led to more complex electronic designs, though all the essential ideas of modern computers are to be found in Babbage’s analytical engine. His varied work in other fields has led him to be described as “pre-eminent” among the many polymaths of his century.
He was the first person to design a computer that is different from a calculator. Charles Babbage is referred to as the father of modern day computers because all his ideas are contained in modern computers.
1. DIFFERENCE MACHINE
In 1822, Charles Babbage developed the difference machine that could perform intricate calculations correctly and rapidly on the principle that anticipated the modern electronic computer. A difference engine is an automatic mechanical calculator designed to tabulate polynomial functions. The name derives from the method of divided differences, a way to interpolate or tabulate functions by using a small set of polynomial coefficients. Most mathematical functions commonly used by engineers, scientists and navigators, including logarithmic and trigonometric functions, can be approximated by polynomials, so a difference engine can compute many useful tables of numbers.
2. ANALYTICAL ENGINE
In 1837, the Analytical Engine was developed and it could be programmed. That means it can receive instructions and solve problems given to it. The Analytical Engine was a proposed mechanical general-purpose computer designed by English mathematician and computer pioneer Charles Babbage. It was first described in 1837 as the successor to Babbage’s difference engine, a design for a mechanical computer. The Analytical Engine incorporated an arithmetic logic unit, control flow in the form of conditional branching and loops, and integrated memory, making it the first design for a general-purpose computer that could be described in modern terms as Turing-complete. In other words, the logical structure of the Analytical Engine was essentially the same as that which has dominated computer design in the electronic era.
The Analytical Engine had the following parts:
- A mill for calculation
- A store for holding instructions, intermediate and final results
- An operator (or system) for carrying out instruction
- A device for ‘reading’ and ‘writing’ data on punched card
Presentation
The topic is presented step by step
Step 1: The class teacher revises the previous topics
Step 2. He introduces the new topic
Step 3: The class teacher allows the pupils to give their own examples and he corrects them when the needs arise
Conclusion The class teacher wraps up or concludes the lesson by giving out a short note to summarize the topic that he or she has just taught. The class teacher also goes round to make sure that the notes are well copied or well written by the pupils. He or she makes the necessary corrections when and where the needs arise.
EVALUATION
- Mention the two (2) machines invented by Charles Babbage and their years of invention
- Mention at least four (4) parts that make up an analytical engine
- Briefly describe the following (i) Jacquard loom (ii) Stepped Reckoner