Petrus van Musschenbroek (1692–1761), man of tribology

Petrus van Musschenbroek was a famous scientist and inventor, natural philosopher, experimental physicist, engineer, instrument builder, experimenter, in the continental Newtonian tradition of Boerhaave and ‘s Gravesande. And: a tribologist. He is one who deserves more fame than he has received so far, and which is well documented in this publication. Van Musschenbroek coined the name tribometer for his device to measure friction in a journal bearing, and some authors rightly refer to this. However, what seems to have remained unnoticed until now is that he also published quantitative results of his friction measurements and tried to arrive at general laws of friction based on them. He reported in detail on friction experiments on sliding, dry as well as lubricated, sliders and journal bearings, a novum in his time, as early as in 1734. When the data from Van Musschenbroek's tables are mapped into graphs, a method which was not in use at that time, two Stribeck curves for journal bearings emerge. Van Musschenbroek's work deserves much more acclaim in the tribology community than it has now.

“The lungs of a ship”: Ventilation, acclimatization, and labor in the maritime environment, 1740–1800

This article examines the connection between projects for shipboard ventilation and the shifting medical discourse about acclimatization in the British Empire during the eighteenth century. I argue that the design, use, and disuse of a class of shipboard “ventilators” proposed by natural philosopher Stephen Hales helps us to trace changing ideas about the ability of European bodies to acclimate, or “season,” to tropical environments. These ventilating machines appealed to British administrators because they represented an embodiment of providential and enlightened ideas that validated the expansion of overseas empire. In addition, they promised to increase labor efficiency by reducing the mortality and misery experienced by the sailors and enslaved people during long sea voyages. As skepticism about acclimatization grew in response to stubbornly high mortality rates in the West Indies, Hales’ ventilators fell out of favor – a development underscored by their dismissal as a potential solution for the appalling conditions found in the transatlantic slave trade. By examining ventilators’ nearly fifty-year career in naval and slave ships, this article will show the role of technology and the shipboard environment in the transition from enlightened optimism about acclimatization toward later attitudes of racial and environmental essentialism.

The Food, Water, Air and Fire Doctrines in Ancient Indian and Greek Philosophies from a Comparative Perspective

The main aim of this article lies in the comparison of ancient cosmico-natural elements from the Vedic period with their counterparts in the Presocratics, with a focus on food, air, water and fire. By way of an introduction to the ancient elemental world, we first present the concept of food (anna) as an idiosyncratic Vedic teaching of the ancient elements. This is followed by our first comparison—of Raikva’s natural philosophy of Vāyu/prāṇa with Anaximenes’s pneûma/aér teaching in the broader context of both the Vedic and Presocratic teachings on the role of air/breath. Secondly, water as brought to us in pañcāgnividyā teaching from Bṛhadāraṇyaka Upaniṣad and Chāndogya Upaniṣad is compared to the teaching of the Greek natural philosopher Thales. Finally, the teaching on fire as heat being present in all beings (agni vaiśvānara) and in relation to cosmic teachings on fire in the ancient Vedic world are compared to Heraclitus’ philosophy of fire as an element. Additionally, this article also presents a survey and analysis of some of the key representatives of comparative and intercultural philosophy dealing with the elemental and natural philosophy of ancient India and Greece.

Martin Folkes and the Royal Society Presidency

The Royal Society under Martin Folkes’s presidency not only promoted pioneering experiments in biological vitalism, but embraced new investigations in static electricity, primarily with the use of insulators. This chapter analyses Folkes’s patronage of the electrical work of artist and natural philosopher Benjamin Wilson, and to what extent Wilson was influenced by the Irish natural philosopher and physician Bryan Robinson. Lastly, the chapter delineates the Royal Society’s research in seismology and electricity, precipitated by the the London earthquakes of the 1750s.

Cornish science, mine experiments and Robert Were Fox's Penjerrick letters

In 2019 a collection of letters from the nineteenth-century natural philosopher Robert Were Fox was discovered in his home at Penjerrick in Cornwall. Fox came to the attention of scientific audiences for experimentally establishing that temperature increases with depth beneath the Earth's surface, and later secured fame for his magnetic dipping needle, developed to measure terrestrial magnetic phenomena. The newly uncovered Penjerrick letters constitute a valuable archival discovery with important historical ramifications for our understanding of Fox's work and its place within nineteenth-century science. As well as highlighting the central role of networking in promoting provincial science, the letters reveal the prominence of the Cornish mine as a site of experiment within British scientific culture. These venues presented Fox with unique spaces in which to scrutinize nature, but such philosophical investigations were unverifiable within a laboratory and appeared susceptible to inaccuracies arising from the working conditions of this uncontrollable environment. Nevertheless, the Cornish mine was crucial to the development of Fox's dipping needle, which became the premier device for making magnetic observations at sea in the 1840s. In this article, I demonstrate the epistemologically problematic nature of the mine as an experimental space that was to take on a central role in the worldwide magnetic survey that historians have described as the ‘Magnetic Crusade’.

In Search of a Theory of Everything

In Search of a Theory of Everything takes readers on an adventurous journey through space and time on a quest for a unified “theory of everything” by means of a rare and agile interplay between the natural philosophies of influential ancient Greek thinkers and the laws of modern physics. By narrating a history and a philosophy of science, theoretical physicist Demetris Nicolaides logically connects great feats of critical mind and unbridled human imagination in their ambitious quest for the theory that will ultimately explain all the phenomena of nature via a single immutable overarching law. This comparative study of the universe tells the story of physics through philosophy, of the current via the forgotten, in a balanced way. Nicolaides begins each chapter with a relatively easier analysis of nature—one conceived by a major natural philosopher of antiquity—easing readers gradually into the more complex views of modern physics, by intertwining finely the two, the ancient with the new. Those philosophers’ rigorous scientific inquiry of the universe includes ideas that resonate with aspects of modern science, puzzles about nature that still baffle, and clever philosophical arguments that are used today to reassess competing principles of modern physics and speculate about open physics problems. In Search of a Theory of Everything is a new kind of sight, a philosophical insight of modern physics that has long been left unexamined.

Across the Atlantic (1831)

John and his band of emigrants set sail for the United States in May 1831. John kept a diary during the voyage. In its pages, we glimpse the young John “in full”: the science geek, the nature lover, the social animal, the intellectual omnivore, the natural philosopher, the strict organizer, the staunch champion of the steerage, and the comfortable member of the cabin. It is a startling portrait of a little known man, Johann Röbling—as distinct from John Roebling, the famous manufacturer, inventor, and engineer—the excited, hopeful young emigrant. The first thing the Mühlhausen Emigration Society did in the New World was head off in separate directions. The handful of followers that remained loyal to John spent two weeks fixing their priorities and principles (they sought to avoid the odious institution of slavery at all costs) in Philadelphia, before gathering themselves and moving off into the interior.

Concepts of Space in the Fourteenth Century

Spatium or “space” was not a technical term of late medieval natural philosophy. Instead, scholastic Aristotelians took locus or “place” as the relevant physical concept. The major topics to be considered here are (1) Aristotle’s concept of “place” in book IV of the Physics and in commentaries on it; (2) the appearance and use of the Latin word spatium in works of abstract or concrete mathematics; and (3) discussions of imaginary space outside the physical cosmos, often in connection with the ubiquity of God or the place and motion of angels. Examples are taken from the works of John Philoponus, Henry of Ghent, and most often from the work of the fourteenth-century natural philosopher and theologian Nicole Oresme.