Clarke secured a patent for her invention of the Clarke Calculator. This device simplified calculations for electrical power transmission problems, improving efficiency and accuracy.

Clarke published the first volume of her comprehensive textbook, which became a standard reference for electrical engineers. It covered foundational aspects of power systems, including analysis and calculations.

The second volume of her textbook expanded on the content in Volume I, delving deeper into advanced power system analysis techniques. It covered more complex topics in detail, furthering her reputation as an expert.