Brown & Sharpe No 36. This one isn’t in my 1905 catalog and the last patent date on it is Nov 6 1894 so its pretty old, possibly 19th century. Pitting was pretty deep but the rust was easy to remove. I find that most micrometers clean up well and I’ve got a good success ratio [...]

Sometime around WW1 Brown & Sharpe introduced the No. 11 micrometer. At that time it wasn’t called the No. 11. It was called the “Rex”. The only Rex in my collection is so horrid looking that I have to include some catalog pages. Besides, there are 3 different frame variations. Below is a catalog page [...]

Below is a micrometer caliper. In particular, this is a one inch outside micrometer caliper. It measures outside dimensions from zero to one inch by thousandths of an inch. A two inch outside micrometer would measure from one to two inches, and a three inch from two to three inches, etc. This particular “mic” was made [...]