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 chapters 1, 2, 3 & 4 to offer here so far, concerning the sharpness of the image produced by a convex or plano-convex lens, or a series of these.

chapter I  : Concerning the spreading of the image shown by a single lens.

chapter 2  : The spreading of the image presented by several lenses.

            chapter 3  : Concerning multiple or composite lenses.

            chapter 4  : Concerning the confusion of vision both by the apparent magnitude and clarity of the image.

Ian Bruce. Dec. 18th , 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. My email address can be constucted from the information at the bottom of the introductory page of this website.