J.T. Slocomb Company

August 3rd, 2008

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 by  the J.T. Slocomb Company, of Providence, Rhode Island, probably sometime in the 1940′s.

J.T. Slocomb calipers were well-regarded by machinists. They were noted for their robustness and unique means for wear adjustment, which made the calipers last longer (the opposite of the way things are made nowadays). Page 89 of the 1920 catalog is a cutaway view of a model 25 micrometer (below).

Here’s a model 35 and its page in the catalog.

Like most tool companies of the time, the inside of their catalog had a picture of the factory. Not the most impressive building then or now, (see image below) but their product line was only micrometer calipers and countersink drill bits, so a gigantic complex wasn’t necessary. Sometime in the 1950′s, they moved from Providence, Rhode Island to Glastonbury, Connecticut. The old factory (actually their second one in Providence) has been converted to commercial storage.

Edit 5/3/10..

Below is a scan of the instruction sheet that came with Slocomb micrometers.

12 Responses to “J.T. Slocomb Company”

  1. dean

    great post. As far as I can tell, they are still in operation, although their website is not working.

  2. mike

    I appreciated finding your site as I was looking up history for my slocomb mic. Seeing the catalog print was very cool, I’ll print that out for my notes. Really enjoyed your other posts, nice to see another person who recognizes the need for fifteen vices! Keep up the good work!

    Mike

  3. glenn

    Thanks Mike.

  4. Stoopatuspifs

    Other variant is possible also

  5. glenn

    Peteski.
    My use of Slocomb micrometers was in a non production environment however I have talked with machinists who preferred them .

  6. PAUL DUGRE

    PICKED UP A JT SLOCUMB WE5 1 INCH MICROMETER ITS .002 OUT , CANT SEEM TO FIGURE OUT HOW TO ADJUST IT ???? dugresautorepair@yahoo.com

  7. glenn

    Paul, I edited the post to include the instruction sheet. You’ll need a special little spanner wrench though.
    Good luck.

  8. brian

    I am a 70 year young retired engineer in my hobby shop I have a model 35 mike
    in its box with its guarantee and caution slip . it was my fathers mike before me but is still in used A wonderful tool.

  9. CAROL KAWAHARA

    i HAVE A MICROMETER IN A BOX. tHE BOX LID SAYS SUPREME 1′ MICROMETER.

    PART NUMBER 161201. CAN YOU TELL ME ANYTHING ABOUT THIS.

  10. Mark Cosens

    I am selling a Slocomb 26 inch micrometer and thought someone here might like to know. Any info would be great.
    You can follow this link:
    http://london.kijiji.ca/c-buy-and-sell-tools-equipment-Large-26-Inch-Aluminum-Micrometre-J-T-Slocomb-Co-Pat-1896-W0QQAdIdZ262357675

    Cheers,
    Mark

  11. Bill

    Anyone have any idea what these great old micrometers are worth? I have the one inch and the next two sizes up.
    Thanks,
    Bill

  12. Grinder

    I have a 1-2″ pair with two date’s one a patent date of (off hand) Apr 96′ ( I assume 1897) and a date below that June 23, 97′. They calibrated..Anybody know what them dates mean…is the second date a manufacturing date.

    Any value…?

    Grinder

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