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Technology

Grade 5

Graphic communication

Module 4

Measuring systems

The development of measuring systems

Background:

Since the earliest times measuring was one of man’s most important activities, but in those days no accurate measuring-instruments existed. Parts of the human body were used as measuring-instruments and these later became the measuring-units. As technology developed, and people gradually became more civilised, measuring-instruments and measuring-units became more accurate.

What is measuring:

Measuring is the process of comparing that which we want to measure with the unit with which we measure.

The Romans standardised and safeguarded the Babylonian measuring-systems in ± 600 B.C., and these systems were used throughout the entire civilised world of that time.

The Roman measuring system:

1 foot = 16 fingers’ breadth = 12 inches

1 ½ foot = 1 ell

2 ½ foot = 1 step

5 foot = 1 double step

1 000 double steps = 1 mile

4 fingers’ breadth = 1 hand breadth

3 hands’ breadth = 1 span

2 span = 1 ell

ASSIGNMENT 1:

[lo 3.2]

What problem was caused by the fact that people of an earlier civilisation used their limbs as measuring-instruments?

Measures and Weights

In Biblical times people used different measures and weights from those that are used today. Try to use their measures.

a) A finger’s breadth is the breadth of a finger.

b) A hand’s breadth is measured below the fingers.

c) A span is measured right across an outstretched hand.

d) An ell is the length from the elbow to the tips of the fingers.

ASSIGNMENT 2: [lo 3.1]

In old translations of the Bible we read that Goliath was six ell and a span. According to the scale one ell = two span, thus Goliath was __ span tall. Measure this out and then measure the length with a measuring-tape. How does his length compare with your own length?

(Copy and complete)

His length:

My length:

Difference:

According to the new translations of the Bible Goliath was

__ m tall (see 1 Sam. 17:4).

Is there a marked difference?

If there is, give a reason for this difference.

ASSIGNMENT 3:

[lo 3.2]

Something interesting: Noah’s ark was 300 ell long.

Measure the ell (from the point of the middle finger to the elbow) of three teachers at your school. Copy the table and complete:

Name of Teacher ELL in mm
1
2
3
Average ELL

Calculate the length of the ark in mm

At break time, measure it out on your playing field. According to Gen. 6:15 the ark was 135 m long.

Does your answer agree with that?

If not, why would it differ?

Background:

In 1834 the English kings made it their mission to develop a uniform measuring-system that could be used throughout the whole world, because each country in Europe had its own system. The metric system came into being as a result of the work of brilliant French scientists and mathematicians who developed a new decimal measuring-system in 1795. A fixed length was allocated to a specific unit and this resulted in the fact that from then on measurements were reliable. By the end of the 19 th century 22 countries were already using the metric system.

Certain measuring-instruments were designed and this made the job of measuring things much easier. Some of these instruments are the tape-measure, the precision measuring wheel, the metre-stick and the ruler.

Questions & Answers

Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
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Source:  OpenStax, Technology grade 5. OpenStax CNX. Sep 23, 2009 Download for free at http://cnx.org/content/col10979/1.2
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