The “couple” is an intriguing unit that measures torque, essentially describing a pair of equal and opposite forces acting on a body in parallel planes. Despite its relatively obscure use in modern contexts compared to units like the newton-meter, the concept of a couple is fundamental in engineering and physics. It is vital in the analysis of systems that require rotational movements, such as gears, engines, and propeller shafts, highlighting the unit’s significance in various mechanical and structural applications.
Interestingly, what’s unique about a couple is that its effectiveness is independent of the point of rotation. This property allows engineers to simplify complex systems, focusing purely on the magnitude and direction of rotation rather than the specific pivot point, making their calculations both practical and efficient.
The “Long Hundred,” also known as a “Great Hundred,” might perplex many today as it stands at 120, instead of the standard 100. Rooted in historical and linguistic evolution, this ancient counting system was prevalent in Northern Europe, notably England and Germany, during the Middle Ages. This unconventional unit was used in various contexts, especially in calculations involving large quantities, such as trade goods or livestock. The Long Hundred illuminates how numbers were historically adapted to meet specific community needs and showcases the fluidity of numerical systems. As societies developed standardized counting methods, such unique units gradually fell out of use, yet they remind us of the rich tapestry of historical numeral lore.
| Couples | Long Hundred |
|---|---|
0
cp
|
0
long-hundred
|
0.5
cp
|
0.00833333
long-hundred
|
1
cp
|
0.0166667
long-hundred
|
1.5
cp
|
0.025
long-hundred
|
2
cp
|
0.0333333
long-hundred
|
2.5
cp
|
0.0416667
long-hundred
|
3
cp
|
0.05
long-hundred
|
3.5
cp
|
0.0583333
long-hundred
|
4
cp
|
0.0666667
long-hundred
|
4.5
cp
|
0.075
long-hundred
|
5
cp
|
0.0833333
long-hundred
|
5.5
cp
|
0.0916667
long-hundred
|
6
cp
|
0.1
long-hundred
|
6.5
cp
|
0.108333
long-hundred
|
7
cp
|
0.116667
long-hundred
|
7.5
cp
|
0.125
long-hundred
|
8
cp
|
0.133333
long-hundred
|
8.5
cp
|
0.141667
long-hundred
|
9
cp
|
0.15
long-hundred
|
9.5
cp
|
0.158333
long-hundred
|
10
cp
|
0.166667
long-hundred
|
10.5
cp
|
0.175
long-hundred
|
11
cp
|
0.183333
long-hundred
|
11.5
cp
|
0.191667
long-hundred
|
12
cp
|
0.2
long-hundred
|
12.5
cp
|
0.208333
long-hundred
|
13
cp
|
0.216667
long-hundred
|
13.5
cp
|
0.225
long-hundred
|
14
cp
|
0.233333
long-hundred
|
14.5
cp
|
0.241667
long-hundred
|
15
cp
|
0.25
long-hundred
|
15.5
cp
|
0.258333
long-hundred
|
16
cp
|
0.266667
long-hundred
|
16.5
cp
|
0.275
long-hundred
|
17
cp
|
0.283333
long-hundred
|
17.5
cp
|
0.291667
long-hundred
|
18
cp
|
0.3
long-hundred
|
18.5
cp
|
0.308333
long-hundred
|
19
cp
|
0.316667
long-hundred
|
19.5
cp
|
0.325
long-hundred
|
20
cp
|
0.333333
long-hundred
|
20.5
cp
|
0.341667
long-hundred
|
21
cp
|
0.35
long-hundred
|
21.5
cp
|
0.358333
long-hundred
|
22
cp
|
0.366667
long-hundred
|
22.5
cp
|
0.375
long-hundred
|
23
cp
|
0.383333
long-hundred
|
23.5
cp
|
0.391667
long-hundred
|
24
cp
|
0.4
long-hundred
|
24.5
cp
|
0.408333
long-hundred
|
25
cp
|
0.416667
long-hundred
|
25.5
cp
|
0.425
long-hundred
|
26
cp
|
0.433333
long-hundred
|
26.5
cp
|
0.441667
long-hundred
|
27
cp
|
0.45
long-hundred
|
27.5
cp
|
0.458333
long-hundred
|
28
cp
|
0.466667
long-hundred
|
28.5
cp
|
0.475
long-hundred
|
29
cp
|
0.483333
long-hundred
|
29.5
cp
|
0.491667
long-hundred
|
30
cp
|
0.5
long-hundred
|
30.5
cp
|
0.508333
long-hundred
|
31
cp
|
0.516667
long-hundred
|
31.5
cp
|
0.525
long-hundred
|
32
cp
|
0.533333
long-hundred
|
32.5
cp
|
0.541667
long-hundred
|
33
cp
|
0.55
long-hundred
|
33.5
cp
|
0.558333
long-hundred
|
34
cp
|
0.566667
long-hundred
|
34.5
cp
|
0.575
long-hundred
|
35
cp
|
0.583333
long-hundred
|
35.5
cp
|
0.591667
long-hundred
|
36
cp
|
0.6
long-hundred
|
36.5
cp
|
0.608333
long-hundred
|
37
cp
|
0.616667
long-hundred
|
37.5
cp
|
0.625
long-hundred
|
38
cp
|
0.633333
long-hundred
|
38.5
cp
|
0.641667
long-hundred
|
39
cp
|
0.65
long-hundred
|
39.5
cp
|
0.658333
long-hundred
|
40
cp
|
0.666667
long-hundred
|
40.5
cp
|
0.675
long-hundred
|
41
cp
|
0.683333
long-hundred
|
41.5
cp
|
0.691667
long-hundred
|
42
cp
|
0.7
long-hundred
|
42.5
cp
|
0.708333
long-hundred
|
43
cp
|
0.716667
long-hundred
|
43.5
cp
|
0.725
long-hundred
|
44
cp
|
0.733333
long-hundred
|
44.5
cp
|
0.741667
long-hundred
|
45
cp
|
0.75
long-hundred
|
45.5
cp
|
0.758333
long-hundred
|
46
cp
|
0.766667
long-hundred
|
46.5
cp
|
0.775
long-hundred
|
47
cp
|
0.783333
long-hundred
|
47.5
cp
|
0.791667
long-hundred
|
48
cp
|
0.8
long-hundred
|
48.5
cp
|
0.808333
long-hundred
|
49
cp
|
0.816667
long-hundred
|
49.5
cp
|
0.825
long-hundred
|
50
cp
|
0.833333
long-hundred
|
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