It's always more complicated , isn't it?
Googleing suggests the company was in business from 1830 until 1938 when
it was sold to C.S. Osborne & Co., also of Newark. It was engaged in
making masons' and carpenters' tools, as well as gardening and leather
tools.
Don
On 2017-12-11 3:51 PM, John Ruth wrote:
>
>
> Another possibility is that this is a "Sellers Thread" - fractional
> sizes below 1/4" which are just not the same as the numbered sizes.
>
>
> Do you have the years in which Wm. Johnson operated in Newark? That
> would be a clue because WIlliam Sellers presented his threading system
> at the Franklin Institute on September 15, 1864. If your wing
> dividers are after that date, but before the adoption of the current
> threading system, then Sellers threads are likely.
>
>
> In addition to oddball diameters and threads per inch, the thread
> profile is somewhat different than the current standard with regard to
> the peaks and valleys, although the slopes are still 60 degrees.
>
>
> "Of threads, and threading systems, there is no end!" [ (tm) John Ruth ]
>
>
> Victor Machinery is a good source for odd threading dies and taps.
>
>
> John Ruth
>
> Who collects odd taps and dies.
>
>
> ------------------------------------------------------------------------
> *From:* OldTools on behalf of Don
> Schwartz
> *Sent:* Monday, December 11, 2017 5:34:53 PM
> *To:* old tools
> *Subject:* [OldTools] Thumb screw wanted
>
> I have a pr. of wing dividers made by Wm. Johnson Mfg. of Newark, New
> Jersey which is in need of a thumb screw to secure the setting. I tried
> all of my loose odds and found nothing that fit. The local Bolt Supply
> House agreed that an 8-32 almost fits, but jams up quite quickly, and
> suggested it may be an 8-28 which is not available here due to lack of
> demand. ;-(
>
> The sales person suggested that even though it is an American tool, that
> it may be a British standard threading. Can anyone shed light or point
> me to a supply house, or maybe spare an extra? It's a decent tool, with
> a fine adjustment screw, and I'd like to put it to use.
--
"You can tell a man that boozes by the company he chooses"
The Famous Pig Song, Clarke Van Ness
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