A compendium of Tinker's work can be found in "Miles Albert Tinker and the Zone of Optimal Typography", by Sutherland, Sandra Wright (1989), Unpublished doctoral dissertation, University of Washington. Tinker studied the relationship between tests result and time. He observed a group of undergraduate students who were administered some tests which had time constraints. The subjects who did the tests in double the time did better than those who were given less time and had to do the test at a faster and pressured rate. When the students were given unlimited time, the test results were equivalent to the scores with the results from the time doubled. This study suggested to maximize performance, ample time should be given to complete all tasks. It is unnecessary to extend time beyond that as the results will only be similar. Tinker also studied the best possible ways to teach reading in his book "Teaching Elementary Reading". In this book he addresses the principles and practises to be an effective reading instructor. He emphasises the following aspects of reading, reading readiness, word recognition, vocabulary, comprehension, individual differences, and remedial reading interests, and appraisal. This book is very beneficial to elementary school teachers. One of Tinker's notable contribution in research is a study on the effect of typography of eye movements. The study revealed that poor typography lead to more frequent fixations, and longer pauses. As a result, the overall reading speed was slowed. Another study concerning typography suggested that font size 6 and 14 slowed readers down. His study on Illumination suggested that brighter lights in the work area than the surrounding causes eye fatigue; instead, 25 foot candles would have been sufficient. The following are Tinker's "factors studied". Research from Tinker's studies has "provided material for nearly 200 publications, including seven books." "Over half of Tinker's studies involving typography were co-authored by Donald Paterson, whose interests were aligned with those of present day instructional technologists." Tinker's most important book was "Legibility of Print", which summarized much of the research he conducted during his 32 years at the University of Minnesota. It is "the seminal study on how we read printed type, and it remains the standard for typography even now," decades after it was published.