The London Company of Virginia : a brief account of its transactions in colonizing Virginia, with photogravures of the more prominent leaders reproduced from the collection of historical portraits at Oakridge, Nelson county, Virginia, secured for exhibition at the Jamestown exposition by Thomas Fortune Ryan.

"This copy is one of an edition of three hundred copies printed from type by the De Vinne press."--T.p. verso.

Posthumous works of the Rev. Thomas Chalmers /

Mode of access: Internet.

Who was Thomas Jefferson?

Mode of access: Internet.

The story of Thomas Jefferson, by Gene Stone.

Mode of access: Internet.

Thomas Say, early American naturalist,

Mode of access: Internet.

Thomas Cranmer,

Mode of access: Internet.

La idea de América en las cartas de Thomas Merton a escritores argentinos

Este art��culo, que forma parte de una investigación sobre la poética de traducción y las ideas americanistas de Thomas Merton, explora estos temas a través del análisis de la correspondencia de Thomas Merton con sus cuatro corresponsales argentinos: Victoria Ocampo, Miguel Grinberg, Rafael Squirru y Alejandro Vignati. Si bien en las cartas intercambiadas con estos cuatro actores culturales argentinos los intereses particulares son variados, subyace en todas el ideal americanista que Merton manifiesta a lo largo de sus escritos y su percepción de la poesía sudamericana.

La idea de América en las cartas de Thomas Merton a escritores argentinos

Este art��culo, que forma parte de una investigación sobre la poética de traducción y las ideas americanistas de Thomas Merton, explora estos temas a través del análisis de la correspondencia de Thomas Merton con sus cuatro corresponsales argentinos: Victoria Ocampo, Miguel Grinberg, Rafael Squirru y Alejandro Vignati. Si bien en las cartas intercambiadas con estos cuatro actores culturales argentinos los intereses particulares son variados, subyace en todas el ideal americanista que Merton manifiesta a lo largo de sus escritos y su percepción de la poesía sudamericana.

Thomas Young's contribution to visual optics : the Bakerian lecture "On the mechanism of the eye"

Thomas Young (1773-1829) carried out major pioneering work in many different subjects. In 1800 he gave the Bakerian Lecture of the Royal Society on the topic of the “mechanism of the eye”: this was published in the following year (Young, 1801). Young used his own design of optometer to measure refraction and accommodation, and discovered his own astigmatism. He considered the different possible origins of accommodation and confirmed that it was due to change in shape of the lens rather than to change in shape of the cornea or an increase in axial length. However, the paper also dealt with many other aspects of visual and ophthalmic optics, such as biometric parameters, peripheral refraction, longitudinal chromatic aberration, depth-of-focus and instrument myopia. These aspects of the paper have previously received little attention. We now give detailed consideration to these and other less-familiar features of Young’s work and conclude that his studies remain relevant to many of the topics which currently engage visual scientists.

Thomas Young’s contributions to geometrical optics

In addition to his work on physical optics, Thomas Young (1773-1829) made several contributions to geometrical optics, most of which received little recognition in his time or since. We describe and assess some of these contributions: Young’s construction (the basis for much of his geometric work), paraxial refraction equations, oblique astigmatism and field curvature, and gradient-index optics.

Thomas Young’s investigations in gradient-index optics

Purpose: James Clerk Maxwell is usually recognized as being the first, in 1854, to consider using inhomogeneous media in optical systems. However, some fifty years earlier Thomas Young, stimulated by his interest in the optics of the eye and accommodation, had already modeled some applications of gradient-index optics. These applications included using an axial gradient to provide spherical aberration-free optics and a spherical gradient to describe the optics of the atmosphere and the eye lens. We evaluated Young’s contributions. Method: We attempted to derive Young’s equations for axial and spherical refractive index gradients. Raytracing was used to confirm accuracy of formula. Results: We did not confirm Young’s equation for the axial gradient to provide aberration-free optics, but derived a slightly different equation. We confirmed the correctness of his equations for deviation of rays in a spherical gradient index and for the focal length of a lens with a nucleus of fixed index surrounded by a cortex of reducing index towards the edge. Young claimed that the equation for focal length applied to a lens with part of the constant index nucleus of the sphere removed, such that the loss of focal length was a quarter of the thickness removed, but this is not strictly correct. Conclusion: Young’s theoretical work in gradient-index optics received no acknowledgement from either his contemporaries or later authors. While his model of the eye lens is not an accurate physiological description of the human lens, with the index reducing least quickly at the edge, it represented a bold attempt to approximate the characteristics of the lens. Thomas Young’s work deserves wider recognition.

Digital archives and cultural memory : discovering lost histories in digitised Australian children's literature 1851-1945

A recent Australian literature digitisation project uncovered some surprising discoveries in the children’s books that it digitised. The Children’s Literature Digital Resources (CLDR) Project digitised children’s books that were first published between 1851 to 1945 and made them available online through AustLit: The Australian Literature Resource. The digitisation process also preserved, within the pages of those books, a range of bookplates, book labels, inscriptions, and loose ephemera. This material allows us to trace the provenance of some of the digitised works, some of which came from the personal libraries of now-famous authors, and others from less celebrated sources. These extra-textual traces can contribute to cultural memory of the past by providing evidence of how books were collected and exchanged, and what kinds of books were presented as prizes in schools and Sunday schools. They also provide insight into Australian literary and artistic networks, particularly of the first few decades of the 20th century. This article describes the kinds of material uncovered in the digitisation process and suggests that the material provides insights into literary and cultural histories that might otherwise be forgotten. It also argues that the indexing of this material is vital if it is not to be lost to future researchers.