Published online by Cambridge University Press: 09 November 2011
A combination of excavation and study of accurately surveyed street systems of some Romano-British towns enables a distinction to be drawn between those with newly planned layouts and those founded on the sites of military fortresses. The aims of this article are to summarise very briefly, mainly by means of plans, the evidence for both types and to demonstrate how planned street-layouts can be detected.
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13 Thompson and Whitwell, op. cit. (note 7).
14 Heighway et al., op. cit. (note 4); Britannia vi (1975), 273.
15 Bidwell 1980, op. cit. (note 6).
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17 Hurst, op. cit. (note 4), 66-7.
18 ibid., 66-7.
19 Bidwell 1980, op. cit. (note 6).
20 Bidwell 1980, op. cit. (note 6), 24.
21 Crummy op. cit. (note 1), 76-7 and in this volume under ‘Roman Britain in 1981’.
22 Jones and Gilmour, op. cit. (note 9).
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28 F. G. Skinner, ‘Measures and Weights’, in C. Singer et al. (eds.) A History of Technology (1954), 777.
29 F. Haverfield, Ancient Town Planning (1913), 129.
30 G. C. Boon, Silchester: The Roman Town of Calleva (1974), 92-9.
31 Boon, op. cit. (note 30).
32 In FIGS. 5 and 6, although the measurements are given to the nearest Roman foot, such a degree of accuracy is impossible because of the scales of the plans used. In addition to errors introduced by variations in the Roman foot (i.e. ± 1 per cent), a further ±1 0 Roman feet should be allowed as approximate compensation for the scales of the plans.
33 If a Roman foot of 11·63 in. were assumed instead of 11·60 in. (still within the accepted range), then the correspondence between the actual and theoretical dimensions would be very close indeed.
34 In a recent article, some evidence taken to imply the use of the pes Drusiamis at Silchester, Verulamium and elsewhere has been reviewed and shown to be just as convincing in terms of the pes Monetalis. In favour of the pes Drusianus: Walthew, C. V., ‘Property boundaries and building plots’, Britannia ix (1978), 335–50CrossRefGoogle Scholar ; Frere, S. S., ‘Town planning in the Western Provinces’, Bericht der Romisch-Germanischen Kommission lviii (1977), 87–103Google Scholar. For the reassessment, Duncan-Jones, R. P., ‘Length-units in Roman town planning’, Britannia xi (1980), 127–34CrossRefGoogle Scholar. The interpretation of Silchester's street plan given in the present article (FIG. 5) considerably favours the case for the pes Monetalis since much larger margins of error would have to be assumed to rationalize the plan in terms of the pes Drusianus. The figures 395 and 285 in Duncan-Jones's Table I can be changed to 400 and 275 respectively, since the Silchester street plan appears to have been laid out in multiples of 25, not 5 standard Roman feet as he supposed. The figure 135 applies to an insula which appears to be secondary and was presumably laid out with the forum. More recently still, C. V. Walthew has perhaps weakened the case for the occurrence of the pes Drusianus in civil contexts by arguing that this measure was rare in military planning where the pes Monetalis was the unit normally used (‘Possible standard units of measurement in Roman military planning’ in Britannia xii (1981), 15–35Google Scholar ). Although of uncertain extent, the involvement of the army in civil building projects would make it surprising if the measures used in military contexts did not correspond to those used in civilian planning.
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37 ibid., 377, fig. 82.