A comparative spatial history using GIS, this article examines the similar and differing effects of railway expansion on the growth of postal communications in Great Britain and France from 1830 to the eve of the Great War. It argues that the modern Postal Age in Great Britain and France began in the 1830s. In Britain in 1839, the Parliament obligated private railway companies to convey the Royal Mail throughout the kingdom at reasonable rates. Thereafter, the expansion of postal services and railway networks went hand in hand. Over the years, thousands of new post offices were established and were closer to rail stations than before. As the years wore on the geography of postal communication expanded greatly and by 1914 the majority of rural districts became part of the system of regular, daily mail. In France, a country four or five times larger than England and Wales with a relatively vast rural population, the task of modernizing postal service was a greater challenge. The inauguration of a “rural service” in 1829 employed some 5,000 men as postal carriers to deliver and collect mail throughout the countryside. Thereafter, their numbers grew as new post offices were established to serve villages and small towns with mail deliveries every other day. In the 1880s, under the Third Republic, the state greatly expanded the postal service, deeming it a national mission. It was then that the growing rail network came to shape the national geography of postal service. Hence, at the turn of the century the patterns British and French postal expansions converged.

The occurrence of nonlocal objects, raw materials, and ideas in the southwestern United States (U.S. SW) has long been recognized as evidence of interaction between prehispanic peoples of this region and those of greater Mesoamerica. Although many archaeologists have analyzed the directionality and potential means by which these objects and concepts moved across the landscape, few have assessed the degree to which Mesoamerican practices and traditional assemblages remained intact as the artifacts and ideas moved farther from their places of origin. The current study analyzes the distribution and deposition of blue-green stone mosaics, a craft technology that was well established in Mesoamerica by the Late Preclassic period (300 BC–AD 250) and spread to the U.S. SW by the start of the Hohokam Pioneer period (AD 475). We assess the spatial distribution, contextual deposition, and morphology of mosaics at sites within Hohokam Canal System 2, located in the Phoenix Basin of Arizona. We use these data to infer mosaics’ social value and function within Hohokam social structure. Analyses suggest that, although the technology of mosaic making may have originated in Mesoamerica, the contexts and ways in which mosaics were used in the Hohokam regional system were decidedly Hohokam.

Hydrocarbon contamination plagues high-resolution and analytical electron microscopy by depositing carbonaceous layers onto surfaces during electron irradiation, which can render carefully prepared specimens useless. Increased specimen thickness degrades resolution with beam broadening alongside loss of contrast. The large inelastic cross-section of carbon hampers accurate atomic species detection. Oxygen and water molecules pose problems of lattice damage by chemically etching the specimen during imaging. These constraints on high-resolution and spectroscopic imaging demand clean, high-vacuum microscopes with dry pumps. Here, we present an open-hardware design of a high-vacuum manifold for transmission electron microscopy (TEM) holders to mitigate hydrocarbon and residual species exposure. We quantitatively show that TEM holders are inherently dirty and introduce a range of unwanted chemical species. Overnight storage in our manifold reduces contaminants by one to two orders of magnitude and promotes two to four times faster vacuum recovery. A built-in bakeout system further reduces contaminants partial pressure to below 10−10 hPa (Torr) (approximately four orders of magnitude down from ambient storage) and alleviates monolayer adsorption during a typical TEM experiment. We determine that bakeout of TEM holder with specimen held therein is the optimal cleaning method. Our high-vacuum manifold design is published with open-source blueprints, parts, and cost list.