Rising and Narrowing: 16th-Century Geometric Algorithms used to Design the Bottom of Ships in Portugal

Methods of designing the bottom of ship's hulls were only a small part of the process of building a frame-based ship in Portugal in the 16th and early 17th centuries, but they deserve a careful look. Using a number of geometric algorithms that were already well-known to Italian shipwrights of the 15th century, Portuguese shipwrights obtained the co-ordinates of the turn of the bilge points of the central, pre-designed, frames without the need for making drawings.
© 2006 The Author     

民国时期的行政督察专员制度及其知识背景

行政督察专员制度是南京政府于20世纪30年代初所创设、后逐渐在国共各治区推行和实施的地方层级制度,对当代中国地方政府制度也产生重要影响。该制在民国时期随着国内局势的重大变化,在抗战以前、抗战时期和抗战胜利以后,相继发生了相应的变迁,在国共各治区也有不同的特征和命运。在行政督察专员制创设和演变的过程中,也不应忽视其与学术界流行的相关知识、观念的关联。     

A Basque Shipyard Design Method of the Late 19th and Early 20th Centuries,and its Relationship to Non‐graphic Hull Design of the 15th Century

The aim of the article is to show that the Mutiozabal shipyard in Orio, Gipuzkoa, Spain, was using the tools and procedures of non‐graphic hull‐design methods into the latter 19th and early 20th centuries. These procedures allow a hull to be designed with a very simple set of tools: a template of the master‐frame and some simple graduated gauges or graminhos. The plan of a 65‐Burgos‐foot ¹ (18.11 m) trading boat is used as the basis of the study. The nature of the templates and graminhos is shown in detail, as well as their use.     

Do environmental disturbances of an individual's growth and development influence the later bone involution processes? A study of two mediaeval populations

Age‐dependent cortical bone loss was studied in two mediaeval Polish populations differing with regard to socio‐economic status, as well as the intensity of the occurrence of skeletal indicators of living conditions in the early stages of ontogenesis (compression of the skull base and the narrowing of the lumbar vertebral canal). Cortical bone loss was analysed on the basis of the radiographs of the second metacarpal. Cedynia population (better living conditions) is characterized by higher arithmetic means for the height of the skull base in comparison with Słaboszewo group (low socio‐economic status). In the case of the vertebral canal index, significant interpopulation differences apply only to men. Similar patterns of difference between groups under study regarding bone loss was also found. It turned out that males from Cedynia had more bone mass in adultus and maturus age categories; in females, these differences concern only adultus category. The study involved an analysis of a relationship between the characteristics measuring reactions to environmental stress in early stages of growth and the intensity of bone loss in adult life. We believe that the results presented justify a conclusion that both phenomena may be interrelated to a considerable degree. Copyright © 2001 John Wiley & Sons, Ltd.     

The Conception of Hull Shape by Shell‐builders in the Ancient Mediterranean

Did ancient Mediterranean shipbuilders at the turn of the first millennium have methods to pre‐design the shape of their hulls prior to the construction of the ship? If so, can these methods be identified? This paper proposes that ancient shipwrights were in possession of such design methods, based on geometry, that are comparable to the medieval and post medieval hull‐design procedures called whole‐moulding. These methods are well suited to be transformed into rules‐of‐thumb, therefore allowing the storage and transmission of accumulated knowledge. The implications of this proposal on the present understanding of the transition from shell‐ to skeleton‐building are explored.