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Browsing by Subject "Salt"

Now showing 1 - 2 of 2
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    Philosophical Saltpeter: The Origins and Influence of Gunpowder Technology and the Paracelsian Aerial Niter
    (2019-01) Washa, Quincy
    This thesis re-appraises how the creation and inclusion of niter theories and salt principles played into the reformation of early modern scientific philosophies, suggesting that the adoption of these theories by major figures of the period calls for closer attention by historians of science. In particular, it raises the question of why and how such a humble, earthly mineral took on a supernatural role and became a staple in some of the leading scientific philosophies of the early modern era. I show that salt, or more specifically saltpeter, would not have assumed this identity without the growing importance and popularity accorded to gunpowder weapons beginning in the Renaissance. It was the hermetic alchemist, Paracelsus, who first developed a metaphysical notion of saltpeter and incorporated it into his natural cosmology. Historians of science, such as Allen Debus, Walter Pagel, and Henry Guerlac, have discussed Paraclesus’ first claim to treatment of niter theories and their association with the observed effects of gunpowder. However, I argue that additional evidence, found in Paracelsus’ writings, is needed to further demonstrate this historical connection and to identify differences in the understanding of Paracelsus’ conception and employment of salt as one of three principles of matter, alongside sulfur and mercury, together forming his celebrated tria prima. An examination of the parallel rise of gunpowder weapons and the utilization of saltpeter as their principle source of power showcases the philosophical links between science and emerging technologies in the sixteenth and seventeenth centuries. The transition of saltpeter from a primary component in a technological instrument to a conceptual manifestation of the fundamental structure of reality reflects an epistemological transfer of concepts from craft knowledge to metaphysical and philosophical beliefs. Such narratives may help us understand the development of early modern natural philosophers’ beliefs about causality, agency, and creation.
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    Salt Tolerance in Short Stature Grasses
    (Minnesota Department of Transportation, 1998-07) Biesboer, David D.; Neid, Stephanie; Darveaux, Bettina
    In this project, researchers used extensive laboratory, greenhouse, and field studies to determine the relative salt tolerance of select native grasses and forbs used to re-vegetate rights-of-ways within four meters of the pavement edge. The studies found that grasses prove relatively tolerant to salt, but show poor survivability in the field during over-wintering. In contrast, forbs generally are sensitive to salt in their environment. Planting success of monocultures and mixtures of grasses near the pavement edge was poor. Observed percent coverage after two years ranged from about 10 to 20 percent over all tested species. Monitoring of longer established sites also shows that native species do not increase as a stand ages. Soil amendments including gypsum, potash, and potassium nitrate were only minimally effective in alleviating salt stress in sodic soils, although gypsum may have some promise in further field testing. The application of salt during winter salting operations also permanently and negatively impacts soil chemistry, which in concert with other plant stress factors such as soil compaction and infertile roadside soils, will continue to limit the success of establishing desirable vegetation on the inslopes of heavily salted roadways in Minnesota.