What if no nineteenth century technological development, whatsoever?

I've been thinking that most of our modern world existed, at least in embryo, by the end of the nineteenth century, and that without that century, virtually nothing about the modern world would be the same. So, let's suppose technological development freezes on January 1, 1800, and doesn't start up again until January 1, 1900. So, no trains, cars, machine guns, light bulbs, telephones, telegraphs, motion pictures, steamships, gatling guns, high explosives, anaesthesia, radios etc. were developed in the nineteenth century. What historical developments occur in the nineteeth century, and how do those differ from OTL? And, what happens when things start moving again in the twentieth century?