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Glossary: Home Tables A B C D E F
G H I J K L M N O P
Q R S T Th U V W X
- length-of *
These are informal length units:
London Bus: 31.5 ft = 9.6 m
Cricket : 66 ft = 20.16 m
An american block is a furlong, in length or area.
- Linn *
A system based by W. Wilberforce Mann, in 1871, based on these measures.
Linn: decimetre (length)
Arr: sq decimetre (area)
Soll: cu decimetre = millistere
Capp: cu decimetre = litre
Pondd: kilogram, (mass)
Monn: A coin, at 5 fr, french money.
It differs from metric system, it has prefixes for powers from +10 to -6.
By adding TEMM as 1/10 second, we then have a system for the moon system.
- -llion *
A stem, derived by back-forming mill.ion (thousand-big) into mi.llion (one.llion)
One then derives billion and other high numbers.
English and american practices differ. English makes x-llion into 10**6x,
while the americans make x-llion into 10**3(x+1). The difference is quite
noticable around even /billion/.
- LMT - Length-Mass-Time *
A series proposed by Gauss and others, to base the laws of physics on three
basic units: length, mass and time.
The first problem is that mass is measured in units also for weight,
so one has a division between the Kelvinate ft-lb-s system, and the Stroud
The second problem came when applying dimensions to things like thremmage
which nearly ended up in as L²/T².
That the electrical measures give alternate LMT measures for emu and esu
do not play a part here: one can quite adequately have multiple and diverse
measures, as long as it is made clear what unit is being referenced.
One can quite happily convert lbf into kgf at the same rate as pounds to
kilos, because it is the scale, not the quantity that carries
- litre *
A metric unit about the size of a quart, but is a quarter of nothing special.
The intension was for a kilogram of water to occupy a cubic decimetre.
However, the realignment of the metre meant the kilogram was too large, and
for several years, a litre larger than a cubical d'metre was in use.
The Mohr cc is a gram of water as it might be measured in normal conditions.
The thremm-scale is usually quoted, the sample lists it for 17.5 °C = 436 G.
|design|| 1000.000 || a cubical decimetre (also since 1964) [cu dm]
|1900-1964|| 1000.028 || k'gram water at stated conditions [fl kg]
|Cylinder|| 1000.799 968 || 77.76 cylinder inches = 0.045 cyl ft.
|Hoppus|| 1001.503 || 48 Hoppus inches
|Mohr|| 1002.38 || k'gram of water at a thremm of 17.5 °C = 436 Gorem
The Hoppus Litre is taken as a cylinder, 8 inches in circumference, and 1 ft high.
The Cylinder Litre is taken as a cylinder, 0.3 ft diam, 0.5 ft high. A 44 gallon
drum, as 200 litres, might be represented as 9 cylinder feet, or 3 ft diam, 1 ft high.
- long numbers, count *
A count where twelve tens make the hundred. Long count is typically used of things
that have heads, eg nails, people, cattle, fish. Evidence suggests that in pre-christian
times, all count gives a hundred of six scores in number.
- Look-down Fraction *
A style of representing Added fractions, by
placing the denominator below or after the numerator. This is the usual
style for writing added fractions.
3 l. 15 s. 6 d.
3 & 15 / 20 & 6 / 12 pounds
three and fifteen twentieths and six twelfths
- Look-Up Fractions *
A style of representing Added fractions by
placing the denominator before or above the numerator. In this style,
the denominators act as column heads.
l. s. d.
20 12 three , of twentieth 15,
3 15 6 of twelfth, 6
3 \ 20 & 15 \ 12 & 6
- Lunae *
A concept to replace the Epact in the calculations of
easter. The idea is that instead of using epacts, the month
is aligned so that it has 30 days, and each day falls on a fixed epact.
The days are numbered 1 to 30, with 1 being 21 march.
Lunae dates are typically divided into 19 australs, the
austral being taken as an hour-like unit. The austral associated with a
given Lunae and golden number is A=19*L-GN.
The last two days are taken to have 27 and 30 australs, since the
requirement is that a 29-day month be used.
© 2003-2004 Wendy Krieger