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Wood has been an integral part of the Scandinavians everyday life for thousands of years. There are still several substantial gaps in knowledge about their wood culture during the Late Iron Age since previous research has been focused on more common findings of inorganic materials like ceramics, metals and glass. Archaeologists rarely find wooden artifacts during excavations due to wood disintegrating a lot faster than metal in the ground. Valsgärde is one of Sweden’s most important Iron Age sites since several wooden remains were found there. They show parts of our distant past that we have yet to understand and gain knowledge about. The few preserved wooden artifacts from the Late Iron Age show a rich culture of wood carving. That is why this study focuses on those very few organic objects that are found. Wooden artifacts might potentially be used to determine the social status of the individuals in the graves. This is examined through a comparative analysis of the wooden remains from Valsgärde and other boat graves in Scandinavia. The analysis also reveals what type of wood the artifacts were made of, which makes it possible to determine if they could be from local trees or if they had to be imported. There seems to be a conscious choice of what kind of wood an object should be made of depending on the purpose at hand and social status. In some cases the choice of wood also seems to be based on the symbolic or mythological meaning of the artifact. This study uses previous microscopic wood analysis from the boat graves to give a more in-depth picture of the Scandinavian Late Iron Age wood culture as a whole.

<p dir="ltr">Acoustic guitar soundboard material selection is based on selective evaluations that have been developed over centuries. These traditional practices are not conducive to the guitar industry we experience today because the supply of traditionally acceptable soundboard wood has decreased greatly. The purpose of this research was to develop an objective wood selection metric to determine the sound quality of an acoustic guitar’s soundboard. The metric would replace the subjective evaluations traditionally used to select materials for acoustic guitar soundboards.</p><p dir="ltr">The acoustic properties of sound radiation coefficient, material’s speed of sound, resonance and damping and the material properties of longitudinal and radial elastic modulus, density, and specific modulus were used in an attempt to construct a material selection metric. These variables were selected because the literature review revealed that these were the most critical variables in determining sound quality. The gaps in the literature were testing and analyzing samples that represented the true dimensions of an acoustic guitar soundboard blank and forming the metric. The literature revealed that the previous experimental studies did not have the appropriate test sample dimensions that correspond to the test samples evaluated by the subjective methods.</p><p dir="ltr">The methodology was carried out by using the objective testing counterparts to the subjective assessments found in the literature review. Instrumented hammer tap testing collected data to determine damping and resonance frequencies. A three-point static bending test collected data for longitudinal and radial elastic modulus. Mass and dimension measurements were recorded to calculate density. Calculations were done to compute the acoustic properties and specific modulus of the test samples. These variables were put into a table and underwent statistical analysis in the form of predictor correlation and logistical regression. The experimental variables were modeled against the subjective evaluation of an expert on the usability of the test samples.</p><p dir="ltr">Statistical analysis proved that the dataset did not show any significant separation between “good” or “bad” test samples or a significant correlation between the usability of the test sample and the variables in the dataset. The methodology did not produce an objective material selection metric to determine the sound quality of an acoustic guitar’s soundboard. Future research should include a wider range of measured frequencies and the collection of time domain data.</p>

This thesis analyses the carbonised remains of the great hall building in Gamla (old) Uppsala, Sweden, which burnt down sometime between 7th to 8th century AD. It is easily assumed that the people of Gamla Uppsala, who lived in one of the most important central places in Iron Age Scandinavia, had both the economy and power to build a most spectacular hall. Previous research on halls has focused on architectural changes as well as the power and rituals such buildings might have represented. However, no previous Swedish archaeological studies have discussed the quality of construction wood as an indication of a well-built hall building. Wood can rarely be analysed in-depth as it is most often decomposed, or only a few charred pieces remain from the constructions. The hall in Gamla Uppsala provides an unusually large amount of charcoal remains. Therefore, an anthracological analysis is used in this thesis to discuss the quality of the hall construction based on the choice of timber. The purpose of this thesis was to identify what kind of wood the builders used to construct the great hall, how much timber and time it would take to build the 50 m long hall building and if the required timber could be found in the area surrounding the hall. The purpose was also to try to identify whether the construction wood was of good quality. The results show that the large timbers were of scots pine (Pinus sylvestris), and the wattle walls were made of juniper branches (Juniperus sp.). The great hall required at least 6250 scots pine trees, which is 4–5 hectares of clear-cut logging. As the landscape at Gamla Uppsala mainly consisted of large open fields, there were not enough trees that would grow locally to get this amount of timber for the hall. Junipers would, however, grow in the open landscape, and the builders would have gathered a minimum of 3600–5300 branches for the wattle walls. It would have taken around four months or less to build the hall, not including the time it would take to prepare the building material. The identified construction materials suggest that the timber was carefully chosen for the great hall building in Gamla Uppsala. / I denna uppsats har förkolnat virke analyserats från hallbyggnaden på kungsgården i Gamla Uppsala, som brann ner någon gång mellan 600- och 700-talet e.Kr. Det är lätt att anta att människorna i Gamla Uppsala, som då bodde i en av järnålderns viktigaste centralplatser, hade en tillräckligt stor social och ekonomisk makt för att bygga en spektakulär hallbyggnad. Tidigare forskning om hallbyggnader har fokuserats på arkitektoniska förändringar samt på den sociala makt och de rituella ceremonier som hallbyggnader ofta är förknippade med. Det finns däremot inga arkeologiska studier i Sverige som har fokuserats på virkeskvalitet från byggnader med sådan dignitet som hallbyggnaden i Gamla Uppsala. Möjligheten att utföra djupare analyser på arkeologiskt trä är sällsynt då det ofta hunnit förmultna, eller endast utgörs av några få förkolnade bitar av ursprungsvirket. Hallen i Gamla Uppsala har efter branden en ovanligt stor mängd förkolnat virke som bevarats i gott skick. Genom vedartsanalyser på de arkeologiska trälämningarna kan kvaliteten på hallbyggnaden diskuteras baserat på val av virke. Syftet med denna uppsats var att identifiera vilka vedarter som användes för att konstruera hallen, hur mycket virke som krävdes, hur lång tid det skulle ta att bygga den 50 m långa hallbyggnaden och om virket kunde hämtas i närområdet kring hallen. Syftet var också att försöka identifiera om konstruktionsvirket var av god kvalitet. Resultaten av analysen visar att majoriteten av virket var av furu (Pinus sylvestris), medan flätverksväggarna var gjorda av ene grenar (Juniperus sp.). För att bygga hallen krävdes minst 6250 tallar, vilket skulle motsvara 4–5 hektar avverkad skog. Eftersom landskapet vid Gamla Uppsala huvudsakligen bestod av stora öppna fält kunde det inte ha funnits tillräckligt med träd som växte i närområdet för att samla in den mängd virke som krävdes för konstruktionen av hallen. Ene var tillgängligt i närområdet i det öppna landskapet, och byggarna behövde minst 3600–5300 grenar till flätverksväggarna. Det skulle ha tagit cirka fyra månader eller mindre att bygga hallen, frånsett den tid det skulle ta att förbereda byggmaterialet. Virket verkar ha valts ut noggrant för hallen på kungsgården i Gamla Uppsala.