Chapter 1

• p 4, second paragraph after ``Systems of Units'': the book refers to information on the inside cover of the book; this information is missing, however.
• p 19, Figure 12(a): the arrow next to should point up.
• p 23, Figure 13: interchange the plus and minus signs next to Element 1 (between A and B). This is necessary to make the last sentence of the page be correct.