New experimental evidence on the relation between percussion flaking and flake variation

Controlled experiments in percussion flaking allowed for objective analysis of relationships between variables of flake production and those variables which are attributes of the final result. The independent variables, those controlled by the flintknapper in the production of stone tools, include force and angle of blow, platform thickness and exterior platform angle. The dependent variables are those attributes of the flakes which are often used in current lithic analyses and include interior platform angle, length, thickness and flake termination. The results clearly show that exterior platform angle is highly significant for understanding many aspects of flake production. These and other relationships between the independent and dependent variables are also discussed.     

A map of Germany made after the Swedish Campaign of 1630–48

Summary

The Elizabethan small‐scale maps of towns, beginning with Cuningham's Norwich (1559) and ending with Speed's collection in his Theatre, are often underrated by historians. If used intelligently, these maps, which combine a ground plan with perspective drawing, can give much useful historical information, particularly about the main street pattern; fortifications or other buildings, since demolished; and the extent of suburban development. Large‐scale maps of this and later periods provide not only a reliable record of the changes in the street plan, but often depict the structure of houses or the various kinds of industrial undertakings, and give historical or statistical details of great importance. Many have borders filled with accurate engravings of buildings, since demolished. From the time of Leake's great survey of London (1665), but especially in the second half of the 18th century, an increasing number of towns had accurate surveys made at a scale of approximately 1: 5,000. The best of these show the house plots in detail, the relation of the built‐up area to the open spaces, and land use in the environs. In the first decades of the 19th century plans of the greatest detail and reliability were made for some of the larger towns on a scale of 1 : 2,500. All are valuable material for the student of social and economic history.     

Major Fallacies Surrounding Stone Artifacts and Assemblages

While lithic objects can potentially inform us about past adaptations and behaviors, it is important to develop a comprehensive understanding of all of the various processes that influence what we recover from the archaeological record. We argue here that many assumptions used by archaeologists to derive behavioral inferences through the definition, conceptualization, and interpretation of both individual stone artifact forms and groups of artifacts identified as assemblages do not fit squarely with what we have learned from both ethnographic sources and analyses of archaeological materials. We discuss this in terms of two fallacies. The first is the fallacy of the “desired end product” in stone artifact manufacture, which also includes our ability to recognize such end products. The second fallacy has to do with the notions that lithic assemblages represent simple accumulations of contemporary behaviors and the degree to which the composition of the depositional units we study reliably match the kinds of activities that took place. Although it is beyond the scope of this paper to offer a comprehensive set of new methodologies and theoretical perspectives to solve these problems, our goal here is to stress the importance of rethinking some of our most basic assumptions regarding the nature of lithic objects and how they become part of the archaeological record. Such a revision is needed if we want to be able to develop research questions that can be addressed with the data we have available to us.     

USING THE GETIS STATISTIC TO EXPLORE AGGREGATION EFFECTS IN METROPOLITAN TORONTO CENSUS DATA

In an earlier paper by the same authors (Amrhein and Reynolds 1996), the variation of the G statistic (Getis 1991; Getis and Ord 1992) was demonstrated to correlate very highly with calculated aggregation effects. In the conclusions to this earlier paper, we called for experiments with different data sets, different aggregation rules, and different definitions of the connectivity matrix. In this paper, we explore the behaviour of census data from enumeration areas of the Toronto Census Metropolitan Area. Experiments are conducted that describe the aggregation effects that creep into the data at different scales, and the effect of the aggregation algorithm on the results. Finally, we test the ability of a modified G statistic, our Getis statistic, to predict aggregation effects