Typographical Errors and Hints

The Sketch of the Analytical Enigine.. uses some typgraphical conventions not common today, and there are a few apparent typographical errors.

It has been typeset anew in several places, e.g. in Charles Babbage and his CALCULATING ENGINES, edited by Philip and Emily Morrison, Dover Publications 1961, and online at http://fourmilab.ch/babbage/sketch.html. Both contain some additional typographic errors.

• Instead of nested parenthesis, parts of equations are overbarred instead, e.g. (4.) on page 716
• In the first equations of Note E (p.684), most reprints correctly use the upper index '1' instead of the prime as in the original
• In Note E p.714, equation 3, there is missing a cos in the second term of the right hand side; the formula should read `cos n theta * cos theta = 1/2 cos [(n+1) theta] + 1/2 cos [(n-1) theta]`