Hoppus

The hoppus cubic foot (or ‘hoppus cube’ or ‘h cu ft’) was the standard volume measurement used for timber in the British Empire and countries in the British sphere of influence before the introduction of metric units. It is still used in the hardwood trade in some countries. This volume measurement was developed to estimate what volume of a round log would be usable timber after processing, in effect attempting to ‘square’ the log and allow for waste. The hoppus ton (HT) was also a traditionally used unit of volume in British forestry. One hoppus ton is equal to 50 hoppus feet or 1.8027 cubic meters. Some shipments of tropical hardwoods, especially shipments of teak from Myanmar (Burma), are still stated in hoppus tons.[1]

## Contents

* 1 History
* 2 Calculation of timber volume in round logs
* 2.1 Equivalents
* 3 See also
* 4 References

## History

The English surveyor Edward Hoppus introduced the unit in his 1736 manual of practical calculations. [2][3] The tables include reference to stone as well as timber, as stone can similarly suffer wastage during processing into regular pieces.

## Calculation of timber volume in round logs

The following calculation can be used to estimate the usable timber in round logs using a "girth tape" that is calibrated in "quarter-girth inches" (e.g. that shows "12" when measuring a 48-inch-circumference log):[4]

Hoppus Volume (h ft) = ("Quarter Girth" (in))2 × Length (ft) / 144 = (circumference (ft) / 4)2 × Length (ft)

### Equivalents

* 1 h ft = 1.273 ft3
* 27.74 h ft = 1 m3
* 1 h ft = 0.03605 m3

## See also

* Board foot
* Cord (unit)
* Cubic ton
* List of unusual units of measurement
* Units of measurement

## References

1. ↑ "Myanmar Inter Safe Co., Ltd". http://www.myanmarwood.com/measure.shtml.
2. ↑ Rowlett, Russ (July 11, 2000). "Units: H". http://www.unc.edu/~rowlett/units/dictH.html.
3. ↑ Hoppus, Edward (14 November 2017). "Hoppus's Tables for Measuring, Or, Practical Measuring Made Easy: By a New Set of Tables ...". Longman and Company. https://books.google.com/books?id=M7tJAAAAIAAJ&q=edward+hoppus.
4. ↑ "Genesis Timber Specs". http://www.genesisny.net/Commodity/Timber/Timberspec.html.

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Imperial units

* Acre
* Avoirdupois system
* Barrel
* British thermal unit
* Bushel
* Chain
* Chaldron
* Cubic foot
* Cubic inch
* Cubic mile
* Cubic yard
* Cup
* Degree
* Demiard
* Dram (unit)
* English Engineering units
* English units
* Exchequer Standards
* Fahrenheit
* Fluid ounce
* Foot
* Foot-candle
* Foot-pound
* Foot–pound–second system
* Foot-poundal
* FPS system of units
* Furlong
* Gallon
* Gill
* Grain
* Gunter's chain
* Hand (unit)
* Hogshead
* Hoppus
* Horsepower
* Horsepower-hour
* Hundred
* Hundredweight
* Inch
* Kenning
* Ksi
* League
* Mile
* Miles per hour
* Minim
* Ounce
* Peck
* Pint
* Pound (mass)
* Pound (force)
* Pound-foot
* Poundal
* Pounds per square inch
* Quart
* Rod
* Rood
* Ship load
* Slug
* Span
* Spinning count
* Square foot
* Square inch
* Square mile
* Square yard
* Stone
* Stuck
* Tablespoon
* Teaspoon
* Thousandth of an inch
* Tmcft
* Ton
* Long ton
* Trade gallon
* Twenty-foot equivalent unit
* Winchester measure
* Yard

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