3 Problems on Writing Practice I'm Confused from

waffle
Fri, 31 Mar 2006 21:08:47 +0000

Many of the instruments used in early operations of the US Army Signal [Corps were adaptations of equipment used by the Plains Indians, particularly that of the heliograph].

Correct Answer: Corps, and in particular the heliograph were adpatations of quipment used by the Plains Indians.

My Answer: No Error

Is it because putting heliograph at the end makes it possibly describe heliograph as a type of Indian, or is there another reason?

Ms. Jordan proudly demonstrated her company’s most popular product, a watch that flashes the time in lighted numerals when PRESSING A BUTTON. (capitalized is the error)

I got this correct but I need a concrete reason why this is an error.