The beveled glass lens in the antique barometer was cracked. The tolerances are very tight fitting the glass in the brass bezel. The glass is friction fit . It is not glued in .
The antique clock sat on the mantel since the beginning of time . One of the kids went to wind the clock and broke the glass . I save old glass for clocks like this. New glass is a different color green and is very flat. The antique glass has a yellow hue and a distorted finish. Sometimes the antique glass has bubbles and blisters . This is important when it comes to the value of the clock. An antique clock with new glass doesn’t retain its resale price.
I have antique beveling machines that run on leather belts. The same type used to make this antique beveled glass lens originally. The fitting of the antique replacement beveled glass in the bezel is very tricky. The tolerances are with in thousands of an inch. I make replacement beveled clock glass for clock shops all over the the country most of them in New York and LA.
This antique clock had a broken glass in it so I used a pc of old mirror and removed the silvering The old glass has more of a yellow color to it the newer glass has a much greener color. I save many types of old glass and on occasions have use my kiln to make new glass look old. I then put on a good inch and a half bevel on the glass My hand beveling machines are older than this old clock. They run with leather belts we use electric motors instead of steam now. Hand beveling old glass for this clock has kept its value.Hand beveling is a dieing trade. Antique Carriage Clocks have very thin glass and are the hardest to bevel. I bevel glass for many clock repair shops .