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NO FULL TEXT AVAILABLE. This thesis contains 3rd party copyright material. ----- This dissertation concerns the iconography of time, how time is represented visually by the visual aspects of time-measurement instruments and devices, and by diagrams and other graphics including calendars, diaries and planners. These representations of time sometimes reflect time itself in a primary way, directly, as in a clock face, a timer, or a calendar, and in other cases the iconography of time is secondary to other variables such as in an industrial process, a genealogical tree, or an evolutionary history. The study's goal was to describe how visual representations of time are constructed from various types of scales, symbols and other marks to create tools for solving different types of time-related problems. The study proceeded principally through the analysis of a large volume of cases, often historical. For specific cases, it asked: What is the purpose of this representation and for whom was it designed? What symbol sets, visual variables, reference points, and scale does it employ? What technology does it use? What are the technological and cognitive strengths and weaknesses of this representation in meeting human needs? Cases were selected from a range of sources including collections of historically-significant designs, journals and magazines considered to contain good designs, design texts, textbooks on topics relevant to this study, time-related electronic tools, timers on modern appliances, and recent calendars and planners. The following theoretical bases were chosen as appropriate for this dissertation because they affect representations of time in some fundamental way: (1) the representation of time in language; (2) the development of writing systems; (3) types of measurement scales; (4) mathematical systems that may have had some influence on the divisions of time used on many visual representations of time; and (5) the astronomical relationships that originally go

A microcomputer based hardware, the Time Interval Board, was designed and the software interface control program was developed. The board measures time intervals between consecutive pulses from a discriminator output. The data is stored in on-board 16K x 16 memory. The microcomputer empties and processes the data when the on-board memory is filled. Data collection continues until the preset collection period is finished or a forced end is initiated. During this period, control is passed between the hardware and the microcomputer via the interface circuit. The designed hardware is IBM PC compatible.

Dar S. Staszica., Sygnatura WTPN: Bb. 73., Z trzema rycinami., Kraków, Call number of WSFS: Bb. 73., Donated by S. Staszic.

[16], 120 p., "An appendix" has special t.p., Reproduction of original in Cambridge University Library., (DLPS) A60472.0001.001, (stc) Wing S4105, http://quod.lib.umich.edu/t/text/accesspolicy.html, To the extent possible under law, the Text Creation Partnership has waived all copyright and related or neighboring rights to this keyboarded and encoded edition of the work described above, according to the terms of the CC0 1.0 Public Domain Dedication (http://creativecommons.org/publicdomain/zero/1.0/). This waiver does not extend to any page images or other supplementary files associated with this work, which may be protected by copyright or other license restrictions. Please go to http://www.textcreationpartnership.org/ for more information.

[16], 120 p., "An appendix" has special t.p., Reproduction of original in Cambridge University Library., (DLPS) A60472.0001.001, (stc) Wing S4105, http://quod.lib.umich.edu/t/text/accesspolicy.html, To the extent possible under law, the Text Creation Partnership has waived all copyright and related or neighboring rights to this keyboarded and encoded edition of the work described above, according to the terms of the CC0 1.0 Public Domain Dedication (http://creativecommons.org/publicdomain/zero/1.0/). This waiver does not extend to any page images or other supplementary files associated with this work, which may be protected by copyright or other license restrictions. Please go to http://www.textcreationpartnership.org/ for more information.