A 1901 catalog promoting transfer lettering and ornaments for wood, metal paint and glass surfaces from The Palm Letter Co. in Cincinnati Ohio. The process was like transferring decals onto any hard surface with the application of a "transfer cement". Once positioned, the paper backing of the letters could be soaked enough to slide off easily, and leaving the letter in place. After cleaning any excess cement away from the lettering with benzine, a finishing coat of varnish could be applied. I don't think this process was a great threat to signpainters at the time as it seems it must have been more time consuming than actually handpainting the signs. Nice catalog none-the-less and found in the Clark Art Institute Library via the Internet Archive.