Steam Punk
1800's technology beyond what it did is Steam Punk, then it is
fascinating speculation. The Difference Engine was the most
popular novel of this type. Many technologies we think to be 20th century are
really 19th:
Fax images
In the 1860's, France was transmitting drawn images on a national
network- Marseilles to Paris was one line. I think the UK also experimented.
Sound Recordings
In the 1860's American inventors transcribed sound to paper disk.
I think there was difficulty doing playback. Allegedly, Lincoln was recorded;
the disk may be misfiled in the Whitehouse.
Camera Images
Although the first accepted photograph images date
from late 1820's, painters used the camera obscura from the 1400's to trace then paint
images. Vermeer is the most studied on this topic.
An authentic story could be written from the 1860's using all of the above.