Added info on reeding

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RogerB
Posts: 666
Joined: Mon Nov 04, 2019 2:30 pm

Added info on reeding

Post by RogerB » Sun Aug 09, 2020 5:53 pm

Those who have read From Mint to Mint will already understand how reeded coin collars were manufactured and the causes of certain errors. The following letter, from 1883, adds a little more detail to the story and might aid collectors in visualizing reeding defects such as overlap and other irregularities. [The file is in NARA RG104 entry 1 box 130, via Newman Numismatic Portal]

Mint of the United States at Philadelphia, Pa.
Machine Shop.

October 2, 1883
Hon. A. Loudoun Snowden

Sir:
As the hubs used in making the knurls, for knurling the periphery of the gold and silver coin collars, are so worn as to be unfit for further use; it will be necessary to prepare new hubs. This I believe can best be done here, if you will allow cutters to be made by Brown & Sharpe, to suit their milling machine.

There are two hubs, one having forty ribs, or teeth, to the inch, and the other fifty to the inch; under the present method of knurling collars, it is not possible that each collar of a particular coin shall contain the same number of ribs or teeth. If wheels are provided for the milling machine we may be able to make tools to overcome this difficulty, if you deem it advisable. For instance, the Silver Dollar with a circumferential line of 4.7124-inch should have 188 ribs or teeth, and the Dime with a circumferential line of 2.700-inch should have 110 ribs.

The plan of knurling the collars with a punch [ed – called a ‘drift tool’] is not new, having been in use at New Orleans for years. The punches are made to correspond to the exact diameters of the coins, and are forced into the collars, making them uniform, as to size and number of ribs. I would be obliged if you will have an old punch of this description, sent for as a pattern. Will you be kind enough to let me know if the cutters as before mentioned can be ordered from Brown & Sharpe, through Mr. Watson, or direct on the manufacturer.
Very respectfully,
Samuel James
Foreman [of machinists]

shortnock
Posts: 306
Joined: Wed May 30, 2018 5:09 pm
Location: Austin, Tx

Re: Added info on reeding

Post by shortnock » Sun Aug 09, 2020 9:48 pm

Thanks Roger for a great quiz question and answer..."Silver Dollar with a circumferential line of 4.7124-inch." Up to this time, only considered the coin's diagonal.
Refrain from computing the total number of poultry... before the process of incubation has fully materialized.

RogerB
Posts: 666
Joined: Mon Nov 04, 2019 2:30 pm

Re: Added info on reeding

Post by RogerB » Sun Aug 09, 2020 11:04 pm

Collars were all about pi not d.

shortnock
Posts: 306
Joined: Wed May 30, 2018 5:09 pm
Location: Austin, Tx

Re: Added info on reeding

Post by shortnock » Mon Aug 10, 2020 12:01 am

Yes, collars, like pie, are round.
Refrain from computing the total number of poultry... before the process of incubation has fully materialized.

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