The First Part Containing Book One,
Concerning the Explanation of the Principles, from which the Construction both of Telescopes as well as Microscopes is Desired.
This is one of Euler's major works, extending over most of his working life; the chapters in the three volumes were produced mainly from his shorter articles produced over many years, and assembled with the help of his co-workers. At present, we have only volume one chapter one to offer here, concerning the sharpness of the image produced by a convex or plano-convex lens.
chapter I : Concerning the spreading of the image shown by a single lens.
Ian Bruce. Sept 30th , 2018 latest revision. Copyright : I reserve the right to publish this translated work in book form. However, if you are a student, teacher, or just someone with an interest, you can copy part or all of the work for legitimate personal or educational uses. Please feel free to contact me if you wish, especially if you have any relevant comments or concerns about this work.