Henry invented the 'Protograph', a type of automatic writing machine that could create multiple copies of documents. This invention aimed to improve efficiency in offices and other settings where document duplication was essential.

Henry also developed improvements to typewriters, though specific dates and details of these patents are not easily available. Her goal would have been to enhance the speed, accuracy, or usability of typewriters.

She had a number of ideas for addressing and mailing machines. Details of these inventions are unclear but they demonstrate an interest in improving communications efficiency.