I am going with a company used by previous designers from the course. The company is known as Scott Glass in stirling.I phoned the company with the figures and shapes of what I wanted to do and they flagged a serious problem I could incur. The average Galileo thermometer has bulbs on the inside and these bulbs have a fluid on the inside. The people at Scott Glass believed that this fluid on the inside will boil when I boiled the bulbs. This boiling fluid on the inside of the bulb will expand shattering the bulb.......... this puts a serious hole n my idea!