MS-195: Early American Document Collection

The Early American Document Collection contains broadsides, manuscripts, and other material from the colonial era and early republic. The material covers a broad range of subjects, mostly pertaining to administration in colonial Philadelphia, and the American Revolution. The series listing below further specifies the subject areas within the collection. Possible research topics include: colonial-era legal, land, or government documentation, the influence of broadside announcements, the use of German in colonial American documents, and for a general investigation into the happenings of the Continental Army. The military documents are more sparse in subject area, and do not include engagement information. The dates are largely bulked from 1727-1728, and also from 1775-1787. The collection does not contain mid-century documents pertaining to topics like the French and Indian War, or specific topics on daily colonial life. The Early American Document Collection also contains a strong variety of colonial watermarks, from domestic and foreign paper. Possible research topics concerning watermarks include: sourcing of the papermaker, the inspiration behind the designs, the region of production, the trade connections between papermaker and user, and the connections between documents with the same watermarks. Further historical information on the use of watermarks in early American documents can be found in the historical notes above. Special Collections and College Archives Finding Aids are discovery tools used to describe and provide access to our holdings. Finding aids include historical and biographical information about each collection in addition to inventories of their content. More information about our collections can be found on our website http://www.gettysburg.edu/special_collections/collections/.https://cupola.gettysburg.edu/findingaidsall/1173/thumbnail.jp

Application of tire dynamics to aircraft landing gear design analysis

The tire plays a key part in many analyses used for design of aircraft landing gear. Examples include structural design of wheels, landing gear shimmy, brake whirl, chatter and squeal, complex combination of chatter and shimmy on main landing gear (MLG) systems, anti-skid performance, gear walk, and rough terrain loads and performance. Tire parameters needed in the various analyses are discussed. Two tire models are discussed for shimmy analysis, the modified Moreland approach and the von Schlippe-Dietrich approach. It is shown that the Moreland model can be derived from the Von Schlippe-Dietrich model by certain approximations. The remaining analysis areas are discussed in general terms and the tire parameters needed for each are identified. Accurate tire data allows more accurate design analysis and the correct prediction of dynamic performance of aircraft landing gear

Hidden Beneath: Watermarks in the Early American Document Collection

This summer, as the Smith Intern at Special Collections, I was tasked with working on a hodge-podge of assembled documents, previously referred to as the “18th Century Document” collection. The box’s contents had been around for just about as long as anyone could remember, and really only got exposure for the Revolutionary War classes that had class sessions through Special Collections. Yet, as I browsed through the collection (which was really a small assemblage of papers), the box was much more than a Revolution collection. [excerpt

Solidification of APC residues using PFA

A pulverised fuel ash (pfa) classed as a waste due to high loss on ignition (LoI) was blended with waste alkali and used to solidify air pollution control (APC) residue from a waste incinerator. The resultant samples were tested for compressive strength and characterised using thermogravimmetric analysis (TGA). The effects of various variables including; l/s ratio, APC content, curing temperature and alkalinity of the liquid phase were examined. Results showed that a lower l/s gave higher compressive strength, analogous to that seen for cement mixes. Curing at slightly elevated temperatures were necessary for setting of the mixes within 7 days. An alkaline liquid fraction increased early age strength. The %(w/w) APC content showed no clear correlation with compressive strength results, but some APC was necessary for the mix to set. Resulys suggest the optimum APC content for compressive strength and solidification may be between 10-20%

Monitor for physical property changes in solid propellants

Specially designed sensor is attached to or imbedded in propellant. When sensor is driven into vibration, it moves with a phase lag directly proportional to internal friction or loss coefficent. Resonance frequency of the system is related to Young's modulus. Modulus or internal friction can be monitored over long period of time

Use of MAGSAT anomaly data for crustal structure and mineral resources in the US midcontinent

Activities concerning the interpretation of processed MAGSAT data and maps are briefly reported. Work involving the identification of long wavelength 'regional' effects that might be associated with varying crustal thickness or Curie temperature depths is processing

Abstracts for the Planetary Geology Field Conference on Aeolian Processes

The Planetary Geology Field Conference on Aeolian Processes was organized at the request of the Planetary Geology Program office of the National Aeronautics and Space Administration to bring together geologists working on aeolian problems on earth and planetologists concerned with similar problems on the planets. Abstracts of papers presented at the conference are arranged herein by alphabetical order of the senior author. Papers fall into three broad categories: (1) Viking Orbiter and Viking Lander results on aeolian processes and/or landforms on Mars, (2) laboratory results on studies of aeolian processes, and (3) photogeology and field studies of aeolian processes on Earth