Nice Computer photos

A few nice Computer images I found:

Image from page 59 of “Trigonometria” (1658)
Image by Internet Archive Book Images
Identifier: trigonometria00newt
Title: Trigonometria
Year: 1658 (1650s)
Authors: Newton, J.
Contributing Library: The Computer Museum Archive
Digitizing Sponsor: Gordon Bell

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book

Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:

Text Appearing After Image:
As the t Argent of the halffum of the two acute angles in a right a ngled triangle,■ Is to the tangent oftheir half difference : So ii the tangent of the half fumme of the opfofite angles in An oblique angled triangle,7 o the tangent of their half difference. D E M0NSTR.ATION. Let the fides A C and A B in the oblique angled triangle A B C,be equal to the fides D F and and FE, in the right angled triangle;^E. ^ I fay then, As the fumme of AC and A B, is to the diffe-r ence of AC and AB.So is the tangent of the half fumme of the an-Ji gles at C and B, to the tang, of half their differ.As the fum of D? C^FE is to the df. o/DF^FE.So is the tang, of the half fumme of the angles at D and E, to the tang, of half their difference, by thefirft variety of this propofition; Therefore , As the tangent of the half fnmme of the angles atD and E, is to the tangent of half thetr difference.So is the tangent of the halffnmme of the angles at C and B, to the tangent of half their difference, aswas to

Note About Images
Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability – coloration and appearance of these illustrations may not perfectly resemble the original work.