2) They were the exclusive producers of a very thin glass for use in microslides for over 100 years
3) They were the first company to produce interchangeable barrels and plungers for syringes, revolutionising modern medicine
The records testify to this desire to create new products and improve on others. There are mixture books and reports recording experiments in the laboratory for producing the perfect coloured and textured glass. There are also over 150 patents in the collection for inventions and improvements to glass making processes granted to Chance and its employees. Amongst these are around 20 original letters patents dating from 1842 to 1860 with their original seals and boxes. Letters patents are a legal instrument in the form of an open letter issued by a monarch or government, granting an office, right, monopoly, title, or status to a person or to some entity such as a corporation. These documents are very large and beautifully illustrated with a large decorative seal attached (please see below). A particular form of letters patent has evolved into the modern patent granting exclusive rights in an invention.
It is also clear from the records that Chances could be ruthless when it came to gaining the trade secrets of other firms. In 1887, Chance director Kenneth Alan Macaulay corresponded with an agent in Belgium called Achille Charlot who had found an ex-employee of a glass manufacturer called Baudoux who would sell their knowledge on how to re-produce Baudoux's ruby glass. Initially, the ex-employee wanted £120 but Charlot managed to bring his price down to £70. This equates to approximately £4,000 in today's money. A bargain for a trade secret, I'm sure you will agree!