How would scientist record their observations?

Write it down.

answ2. A Laboratory Book is a very important part of laboratory equipment. In it are recorded the actual results of an experiment.

The pages of a lab book should be serially numbered, and each day's work ruled off. This process is important when "priority of discovery" is needed.

Naturally, graphs, computer results, photos and sketches all form part of the record, and are pasted in and dated.

Eventually of course, the results and significance of investigations are submitted to a science journal for publication.