# Hoppus

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{{Short description|Unit of volume}}

{{for|the musician|Mark Hoppus}}
The '''hoppus''' [cubic foot](/source/cubic_foot) (or "hoppus cube" or "h cu ft") was the standard volume measurement used for [timber](/source/timber) in the [British Empire](/source/British_Empire) and countries in the British sphere of influence before the introduction of [metric units](/source/Metric_system). 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](/source/forestry). One hoppus ton is equal to 50 hoppus feet or 1.8027 cubic meters. Some shipments of tropical hardwoods, especially shipments of [teak](/source/teak) from [Myanmar](/source/Myanmar) (Burma), are still stated in hoppus tons.<ref>{{cite web|url=http://www.myanmarwood.com/measure.shtml|title=Myanmar Inter Safe Co., Ltd|publisher=|archive-url=https://web.archive.org/web/20100421233230/http://www.myanmarwood.com/measure.shtml|archive-date=April 21, 2010}}</ref>

==History==
The English surveyor [Edward Hoppus](/source/Edward_Hoppus) introduced the unit in his 1736 manual of practical calculations. <ref>{{cite web|last=Rowlett|first=Russ|url=http://www.unc.edu/~rowlett/units/dictH.html|title=Units: H|date=July 11, 2000|archive-url=https://web.archive.org/web/20180802101824/http://www.unc.edu/~rowlett/units/dictH.html|archive-date=August 2, 2018|website=[University of North Carolina at Chapel Hill](/source/University_of_North_Carolina_at_Chapel_Hill)}}</ref><ref>{{cite web|url=https://books.google.com/books?id=M7tJAAAAIAAJ&q=edward+hoppus|title=Hoppus's Tables for Measuring, Or, Practical Measuring Made Easy: By a New Set of Tables ...|first=Edward|last=Hoppus|date=14 November 2017|publisher=Longman and Company|via=Google Books}}</ref> 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):<ref>{{cite web|url=http://www.genesisny.net/Commodity/Timber/Timberspec.html|title=Genesis Timber Specs|website=www.genesisny.net}}</ref>

: Hoppus Volume (h&nbsp;ft) = ("Quarter Girth" (in))<sup>2</sup> × Length (ft) / 144 = (circumference (ft) / 4)<sup>2</sup> × Length (ft)

=== Equivalents ===
* 1 h&nbsp;ft = 1.273&nbsp;ft<sup>3</sup>
* 27.74&nbsp;h&nbsp;ft = 1&nbsp;m<sup>3</sup>
* 1&nbsp;h&nbsp;ft = 0.03605&nbsp;m<sup>3</sup>

== See also ==
* [Board foot](/source/Board_foot)
* [Cord (unit)](/source/Cord_(unit))
* [Cubic ton](/source/Cubic_ton)
* [List of unusual units of measurement](/source/List_of_unusual_units_of_measurement)
* [Units of measurement](/source/Units_of_measurement)

==References==
<references/>

{{systems of measurement}}
{{Imperial units}}

Category:Imperial units
Category:Units of volume
Category:Units of measurement in surveying

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