Brass Triple Escapement Depthing Tool, Switzerland, second half of the 19th Century, three penny foot legs support the 4-in. dia. calibrated work platform with vertical work holders, four knurled thumb screws for adjustment of the work components in relevant directions all in a hinged pine box, ht. of tool, 7 in. It is a pity that there are so few people left in the world who understand the use of this tool. Tool in old brass surface.