Share your favorites on Show & Tell

Need help identifying this antique measuring device

In Tools and Hardware > Show & Tell.
Karl-Fodor's likes4 of 15Antique Buttonhole shears W.B.B & SONMystery Tool
Love it
Like it

Karl-FodorKarl-Fodor likes this.
Vynil33rpmVynil33rpm loves this.
Collectables59Collectables59 loves this.
iggyiggy loves this.
blunderbuss2blunderbuss2 loves this.
Horseradishman1Horseradishman1 loves this.
fortapachefortapache loves this.
AnythingObscureAnythingObscure likes this.
officialfuelofficialfuel loves this.
ToyrebelToyrebel loves this.
See 8 more
Add to collection

    Please create an account, or Log in here

    If you don't have an account, create one here.

    Create a Show & TellReport as inappropriate

    Posted 3 years ago

    (1 item)

    Has a tri-beveled point on end that causes the dial to rotate. Dial has a marked point as well as a pointer in center that appears to be adjustable. Has dial increments of 10's adding up to 100. Appears to be constructed of brass and some form of steel. I can not find any markings on the body except for the aforementioned dial markings

    Unsolved Mystery

    Help us close this case. Add your knowledge below.

    Tools and Hardware
    See all
    Antique Cabinet Furniture Key Hollow Barrel Skeleton Key
    Antique Cabinet Furniture Key Hollo...
    Custom Scrub Plane No 2 Size, w/O-1 3/16 Iron Walnut Infill
    Custom Scrub Plane No 2 Size, w/O-1...
    Stanley Bedrock 605 Hand Plane
    Stanley Bedrock 605 Hand Plane...
    Stanley 71 1/2 Router Plane Vintage Old Antique Woodworking Tool Pat. Oct. 1901
    Stanley 71 1/2 Router Plane Vintage...
    Antique Cabinet Furniture Key Hollow Barrel Skeleton Key
    Antique Cabinet Furniture Key Hollo...
    See all


    1. Toyrebel Toyrebel, 3 years ago
      Possibly a depth gauge
    2. srarman, 3 years ago
      This is an old version of an instrument to measure the speed of a shaft. When the shaft is up to speed you put the point on the end and keep track of how many revolutions are made in a minute. If the tachometer measures 540 revolutions in one minute then the shaft rpm is 540.
    3. AnythingObscure AnythingObscure, 3 years ago
      srarman is correct. Search ebay (etc) for "machinist's RPM gauge" (or similar terms) and you'll find other examples like it. There are also several shown here on CW in other members' collections -- I know I have one of these things myself too somewhere, but don't remember offhand if I've ever shown it...??

    Want to post a comment?

    Create an account or login in order to post a comment.