exotic equipment

13 strange strange objects in the past, but few people know its true use
Living in the period tens to hundreds of years ago, when science and technology has not yet developed, people seem to be more creative when they create many things that look
The strange bell has been around for 175 years, scientists have not been able to explain it
With up to 175 years of operation, this bizarre device is still making a headache for scientists to find the most accurate explanation.