Nice set. Very nice, and useful, find.

The surface gauge looks to have an interesting surface treatment. Jeweled?

The pipe tap is a 'skip tooth' type, as well as for fuel fittings. Skip tooth
has every-other thread segment removed to the root diameter. This is intended to
reduce friction during tapping, among other things. The fuel fitting designation
means that the root is intended to deform the crest of the mating thread and
form a true mechanical seal, as opposed to standard pipe threads, which will
mate with these just fine, where the flanks contact and thread sealant insures
no leakage through the helical path at the crest and root.

Charlie wrote:

>#5736 initially looked to me as the micrometer core of an inside micrometer,
but
>whether that is true or not would depend on how the reference shoe/foot was
>attached and referenced to the surface to accurately measure depth.

It's just a general purpose mic head, intended to be used wherever fine
measurements or adjustment are needed. My optical comparators have the same
style (larger and direct read rather than vernier, but the same style) for table
travel. I have several other tools and fixtures that take these heads. This is a
very nice one. It reads to the ten-thousandth of an inch.

1735: the J T slocomb mics are interesting. This looks to be a 1" to 2" range.
Be careful if you try to unthread the spindle. The are are two parts to the
thread, one in the frame by friction, and one that is face-splined to it, with a
bronze spring in between. They make up for wear automatically, but if the
spindle is unthreaded, all of the way out, the spring may be lost and the
floating part can be lost up inside the thimble. It is an easy fix.

3734: I believe Paul is correct and it is from a transit.

3733: Other views may help.


The B&S protractor head is a nice style, as it is two sided. The single sided
are more common, being less expensive and not restricting rotation of the rule.
This has the advantage that you can mirror an angle easily. I use both types, as
they do serve different purposes.



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