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ideal british *

A system of proportions linking weight to volume, using a largish number of relations advanced for the imperial and pre-imperial measures.
      1 cubic foot \ 1000 oz \ 432 gt ; 1 cu inch = 250 gt
      32 cu ft \ 2000 lb \ 16 oz \ 16 dr \ 27 gt
      40 cu ft \ 2400 lb \ 15 oz \ 8 dr \ 3 scr \ 20 gt
One derives a number of units, like the gallon, from weight. The UK gallon is 160 oz, being 276.48 cu in: this is GO.
      The US gallon, being 10 lb tr cu inches, becomes 230.4 cu in.
      The US proposed system is based on a cubic foot of 1000 oz, but the exact nature of the foot was never settled.

ILF -- inch-ounce-facc*

A SWS system derived from the metric, with the following conversions. This system has been replaced by the TILF system.

inch	metre = 40.8 inches	SI gravity = 1.0002783 inch/facc/facc
ledd	kilogram = 68 ledd	SI water = 1.001217480456 ledd/cu inch
facc	second = 20 facc	-
secJ	kelvin = 17424 secJ	SI spec ht = 0.999987768 erg/ledd secJ

This system was derived from the VIOF system. VIOF is not a SWS system, but is close enough to derive it from.
      The value of gravity for this system is true at 42.48 degrees = 0.118 circle.

scale	Moon	VIOF	TMoon	ILF	TILF
length	m/10	m/40	m / 40	m/40.8	m/40.8
weight	kg	kg/64	kg / 64	kg/68	kg*0.014688
time	s/10	s/20	s / 20	s/20	s/20
thremm	K/1000	K/16000	K / 17280	K/17424	K/17424
charge	C/10	C/128	C/230.4	C/239.584	C/240
gravity	0.980665	0.980665	0.980665	1.0002783	1.0002783
m.water	1.000000	1.000000	1.000000	1.00121748	1.002436443
thermal	4.186800	1.046700	0.969166	0.999987768	0.999987768
atmosph	101.325	405.3	405.3	422.1875	422.701
volt	10	2	1.111111	1.179837559	1.180555555
UES MI	10**8	20**6	120**4	120**4	120**4
foot	3.048	12.192	12.192	12.43584	12.43584
pound	0.45359237	29.02991168	29.02991168	30.84428116	30.88183347

Imperial System *

Properly, this refers to the units that were established by the Imperial Weights and Measures Act of 1824, but is taken to mean all of the Anglo- American units. The USA never recieved the be benefits of the new weights and measures.
      Length: mile \ 8 furlong \ 10 chain \ 4 rods \ 5.5 yard \ 3 feet \ 12 inch
      Weight: ton \ 20 hundredweight \ 8 stone \ 14 pound \ 16 ounce \ 437.5 grain
      troy: pound \ 12 ounce \ 20 pennyweight \ 24 grain
      apothecaries: pound \ 12 ounce \ 8 drachm \ 3 scruple \ 20 grain
      area: acre \ 4 rood \ 40 perch \ 272.25 sq ft
      capacity: bushel \ 4 peck \ 2 gallon \ 4 quart \ 2 pint \ 4 gill \ 5 fl oz
      liq capacity: gallon \ 4 quart \ 2 pint \ 4 gill \ 4 liq oz

-	UK	US	foot in metres	metre in inches	pound in kgrms
UV	1864	-	12/39.37079	39.370 790 000 000	7/15.43234874
UC	1878	-	1/3/1.09362311	39.370 431 960 000	7/15.43235639
US	-	1898	12/39.37	39.370 000 000 000	0.4535924277
UB	1900	-	0.9143992/3	39.370 113 184 701	7/15.43235639
UK	1922	-	0.91439841/3	39.370 147 198 746	0.453592338
UI	1963	1959	0.3048	39.370 078 740 157	0.45359237

For other conversion factors, see Geodetic and New Age values.

Imported Units *

A trade unit used for the importing of goods. Because of the significance of the trade, the unit itself is given a local value, and is essentially assimilated in the same manner that words are borrowed to languages.
      One can usually spot an import-segment because there is a prime greater than seven, or looks out-of-place, is involved.
      For example, of hundredweights, any measure other than 100, 120, or 112 can be assumed to involve an import-measure. The number 112 arises from taking 120/16 = 7 1/2, and then dropping the half.
      See, for example, round-down.

Inch *

A twelfth measure, usually of the foot. The Romans divided any foot they found into 12 uncia, which becomes the modern inch measure.

India *

The dictionary hight Hobson-Jobson, an Anglo-Indian Dictionary, gives these measures, and other words

anna	nail, or sixteenth part [arabic]
beegah	3600 sq gudge = 100 perches = arpent, b. \ 20 beswa
candy	[=to divide] weight of 500 lbs. Bombay c. \ 20 maund \ 28 lbs.
carat	ounce \ 6 (golden) solidus \ 24 carat or siliqua.
cash	any small coin from india, eg 0.001 tael
catty	Chinese wt: picul \ 100 catty \ 16 tael \ 1000 cash
chop	Pidgeon: quick, as in 'chop-chop', 'chop-sticks'
coss	league \ 5000 gudge \ 33 inches ~ 20 furlongs
cowry shell	A money, 320 make the anna
cutcha	raw, small, weak, unfinished, opp. pucka
dam	money: rupee \ 40 dam \ 40 jeetul: eng "could not give a dam"
dub	money: dub = 20 cash
joss	Pidgeon god, idol < port. deus
ghurry	Time of 1/60 day, later, an hour-unit
gudge	Yard measure = 33 inches (gaz)
lee	Macheen itinery measure, ~ 1900 feet or 5/16 n.mile
mace	Malay dwt: catty \ 20 tahil \ 16 mace
maund	m. \40 seer \ 80 tola \ 12 masha (mace) \ 8 ruttee; from sumer mina
marcel	grain measure ~ 12 seer: garce \ 400 marcel \ 800 cu in
pagoda	S.Indian money: pagoda (7s.) \ 42 farun \ 8 cash
pucka	Large, refined, strong, worked, opp. Cutcha
rottel	An arabic pound, 100 make the qintal
rupee	rupee (2 s.) \ 16 anna \ 12 pie
seer	wt of 14400 gr, proposed 1 k'gram.
sicca	= tola, means coined, minted. Rupees were typically one tola
tael	A chinese weight orig 579.84 gt, \ 1000 tsien
tical	A Burmese weight, 80 make the caddy. candy \ 150 vis \ 100 tical \ 100 moo.
tola	wt of 180 gt, also \ 400 karsa (cash).
viss	S.Indian weight: candy \ 20 maund \ 8 viss \ 40 pollam \ 10 padoga wt.

Indian Foot *

In 1865, Clarke determined the foot as used in India to be 0.99999566 of the imperial foot. It convers to metres using the 1865 foot of 0.9144025/3 metre or the UC ratio. . The foot is used in a number of survey values, as the following.
      Indian foot: 1 metre = 39.370142 inches: Indian Foot = 0.99999566 British feet (A.R.Clarke 1865). British yard (= 3 British feet) taken to be J.S.Clark's 1865 value of 0.9144025 metres.
      1937 yard = 0.91439523 metre: Indian Foot = 0.99999566 British feet (A.R.Clarke 1865). British foot taken to be 1895 Benoit value of 12/39.370113m. Rounded to 8 decimal places as 0.30479841. Used from Bangladesh to Vietnam. Previously used in India and Pakistan but superseded.
      G. Bomford; "The Re-adjustment of the Indian Triangulation"; Survey of India Professional Paper 28; 1939.
      1962 yard = 0.9143988 metres: Indian Foot = 0.99999566 British feet (A.R.Clarke 1865). British yard (3 feet) taken to be J.S. Clark's 1865 value of 0.9144025m. Rounded to 8 significant figures with a small error as 1 Ind ft=0.3048996m. Used in Pakistan since metrication.
      1975 yard = 0.9143985 metres: Indian Foot = 0.99999566 British feet (A.R.Clarke 1865). British yard (3 feet) taken to be J.S. Clark's 1865 value of 0.9144025m. Rounded to 8 significant figures as 1 Ind ft=0.3048995m. Used in India since metrication.
      G. Bomford; "Geodesy"; 3rd edition 1975

international electric units *

The electrical units selected for practical application. Beginning in 1867, a series of congresses agreed on the size and eventually, the construction of measures based on the decade multiples of the metric EMU units.
      The final form is based on the following definitions
      One ohm is the resistance of a column of mercury, being 106.300 cm in length, and weighing 14.4521 grammes, the thremm being 0°C. This produces a column of very close to 1 sq millimetre, as originally defined.
      The ampere is that unvariang current, that when passed through a solution of silver nitride in water, deposits silver at the rate of 0.001118 grammes per second.
      From these come these conversions from international to absolute.

ohm, henry	1.000 49
volt, weber	1.000 34
watt, joule	1.000 19
ampere, coulomb	0.999 85
siemens, farad	0.999 51

IPS -- inch-pound-second *

The form of the imperial system used by the US space agency, and others. Since in the US system, the inch and the pound are the named units of conversion, the IPS would be the 'natural' system.
      slinch: poundf second² / inch = 12 slugs or 386 lb.

ISWS -- ISWS: imperial SWS *

A Standard Water system based on imperial units.
      foot = 7 units ; makes standard gravity = 1.0009704
      pound = 5.5 units ; makes metric water = 62.42796 lb/ft3 = 1.0010314; Imp = 0.9987928
      second = 15 units, so day \ 360 degrees \ 60 minute \ 60 second
      degF = 5454.545454 units ; joule constant = 0.9996196432
The time unit corresponds to an arc second of right-ascession
These are common imperial and natural units in this system.
      Time: day = 1296000, hour = 54000, minute = 900, second = 15
      Length: mile = 36960, chain = 462, rood = 115.5, yard = 21, foot = 7, inch = 7/12; nmile = 42560
      Area: Acre = 2134440, Perch = 13340.25, sq foot = 49, sq in 49/144 ~ 1/3
      Volume: Acrefoot = 14941080, cu ft = 343, cu in = 343/1728 ~ 1/5
      Capacity: Gallon = 55.06647306, bushel = 440.5317845, fl oz = 0.34416545
      Weight: Ton = 12320, cwt = 616, stone = 77, pound = 5.5, ounce = .34375 = 11/32
      Fineweight: oz troy = 66/175, shilling = 12/175, grain = 11/14000
      Velocity: ft/s = 0.466666 = 7/15, mph = 0.68444 = 154/225, knot = 0.78814 = 532/675; c = 459001620
      Technical: psi = 16.163265 = 792/49 ; pdl = 0.171111 = 77/450; hp = 1411.666 = 4235/3 ;
      Thermal: degF = 5454.5454 ; Btu = 30000 ; joule constant = 0.9996196
      Atmosphere = 68087.25 pdl = 237.765 (7*34 ft = 238)