This is the ad that describes the Kodak and how its used:
The Kodak is the smallest, lightest, and simplest of all Detective Cameras–for the ten operations necessary with most Cameras of this class we have only THESE SIMPLE MOVEMENTS. No Focussing. No finder required. Size 3 1/2 by 3 3/4 by 6 1/2. Weight 35 ounces. Makes 100 exposures.
For a history of the dry plate go here.
Dry plates were a lot less messy than wet plates and didn’t require all of the hazardous chemicals to develop images.