Objektnummer
54/667
Upphovsman
Beskrivning
This wooden slide rule is 'the cattle gauge and key to the weighing machine arranged by J Ewart Newcastle on Tyne' and has the maker's name 'J Tree, Charlotte St. Blackfriar's Rd., London' on the upper side. It is used for grading carcasses. The weight of the carcass (in stones) is set against the girth (in feet) and then related to the length of the carcass (in feet) to give one of the gauge points, which can be referred to against a table determining the class of the carcass.
Fysisk beskrivning
1 Grading Gauge Wood: Metal ; Brass: Ivory
Arkivhistorik
MERL 'Handwritten accession' form (Institute of Agricultural History) – 'Standard museum name: // Accession number: // Classification: // Negative number: // Acquisition method: // Acquired from, date: ... // Store: // Condition: // Recorder, date: // Description: // Dimensions: // Associated information: The uppermost side (ie with name and maker's address) deals with the carcass. The weight of the carcass (in stones) is set against the girth (in feet) and then related to the length of the carcass (in feet) to give one of the gauge points, eg. I or H and so on. // eg. a carcass weighing 100 stones with a girth of 7 ft and a length of 5 feet gives a grade between D and C. Then, referring to the table one determines the class of carcass by relating its fatness to the grade... thus the 'mod. fat' carcass of a heifer, of gauge point D is a class 1 carcass. // The reverse side relates to the live weight of the animals to the carcass weight. Thus an ox with a live weight (on sliding part) of 100 stone with a carcass weight of 70 gives a percent of carcass of 70%, which means that 70% of the carcass is usable after the hooves, hide etc. have been removed (which obviously in this case constitutes 30% of the carcass). // The table above relates the percentage of usable carcass (ie. the 70% in our example) to the class of the carcass. In this case a percentage of 70 means the animal is a class one, whether its live weight as a steer 'S' is 150 stones, or as a heifere as 120 stones. // (explanation provided by David Betts University of Reading March 1979). // No information as to the use of this particular example. // N.B. J. C Ewart was a famous livestock writer in the last century, writing books such as 'The Ox and its Kind' and 'Sheep and their Kindred'. // References:'
Produktionsplats
, Southwark
Objektnamn
Material
