What specific improvement did Letitia Mumford Geer's 1899 syringe design offer?

Answer

The ability to be operated with one hand using a slide mechanism.

Geer's invention improved injection administration speed and ease by incorporating a slide mechanism that allowed the medical professional to operate the syringe using only a single hand.

What specific improvement did Letitia Mumford Geer's 1899 syringe design offer?
inventionwoman