This vintage machinist's tool kit is a Lufkin Dial Test Indicator, No. 399A or No. 299A. It was produced by The Lufkin Rule Col, Saginaw, Michigan, U.S.A. The wooden box is embossed in gold, "Lufkin" on the lid and has a neat metal latch closure.
The instruction label says,This Indicator is a precision and sensitive tool and should be treated with the same care as a fine watch.
To Use Hold Attachment
Unscrew cap on end of Indicator Base and screw hole attachment part way in. Then, lift moveable end up towards dial face and in a straight line with the base; continue to screw an attachment until it seals tight on base. This is done to guide the inside end of attachment into the hole in spindle of indicator. Replace cap after using attachment.
There might be a couple small bits missing from little holes, but most of the slots are filled. The dial says, "Lufkin. made in U.S.A. No. 399, 0-50-0, Jeweled .001"."
To Use Hold Attachment
Unscrew cap on end of Indicator Base and screw hole attachment part way in. Then, lift moveable end up towards dial face and in a straight line with the base; continue to screw an attachment until it seals tight on base. This is done to guide the inside end of attachment into the hole in spindle of indicator. Replace cap after using attachment.
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