US752493A - Molding-case for use in electrotyping and process of manufacturing same - Google Patents

Description

molding-case in such a manner so as to pre- -manner in which it is manufactured for obtain- Patented February 16, 1904. I

WILLIAM H. WEIJSHY, OF COLLINGSWOOD, NEVVJERSEY.

M'OLDlNG-CASE FOR USE IN ELECTROTYPING AND PROCESS 0F MANUFACTURING SAME. y

SPECIFICATION formingpart of Letters Patent No. 752,493, dated February 16,r 1904.

Application led October 13, 1903.

To cir/ZZ whom t 'may concern:l Be it known that I, WTILLIAM H. WELSH, a citizen of the United States, residing at Collingswood, in the county of Camden and State of New Jersey, have invented new and useful Improvements in Molding-Cases for use in Electrotyping and Processes of Manufacturing the Same, of which the following is a specication.

This invention relates to certain new and useful improvements in molding-cases for use in electrotyping and process of manufacturing the same.

The object of the invention is to prepare the vent the sticking of the impressionable composition of the case to the cut, half-tone, or form while making the impression.

A further object of the invention is to prepare the molding-case in such a manner so as to prevent the slipping or spreading of the impressione-ble composition of the case while the impression is being made from the cut, halftone, or form.

The foregoing objects are obtained by coating or powdering the impressionable composition of the case with an impalpable powdery substance free from grit and other substances injurious to the impression and which I term iiour of copper, and after the coating of the impressionable composition with the liour of copper the case is finished in the known manner.

The impalapable powder or Hour of copper used in connection with the process,l to be hereinafter more fully set forth, is obtained from rendering by grinding or in any other suitable manner the siftings of electrodeposited copper powder impalapable.Y

To more fully set forth the new and improved molding-case for use in electrotyping and the ing the objects hereinbefore set forth, reference is had to the following description and accompanying drawing.

In the drawing, which illustrates a perspective view of a molding-case prepared in accordance with my invention, 1 denotes the ordinary backing of the case, 2 the impressionable composition mounted thereon, which may Seite No. 176,900. (No model.)

be of wax' or any other suitable material, and 3 the coating of flour of copper.

The wax or other composition in which thev The impressionable material is then allowed to solidify to the point desired, and the upper surface thereof is then shaved or otherwise lacted upon so as to form it even and smooth throughout. The copper powder or flour of copperv prepared as set forth is then evenly ldistributed throughout the smooth and even surface of the impressionable material by any suitable means, preferably by a brush. After the case has been prepared in the foregoing manner it is then passed through the ordinary steps of electrotyping-that is to say, the impression is made, subjected to the black-leading machine to be coated with graphite or plumbago, and then to the electrolytic bath.

I have discovered that the Hour of copper referred to, and which is obtained from electrolytically-deposited copper powder inthe manner as hereinbefore set forth, being prac'- tically free from impurities possesses a nonslipping quality, and consequently after the impressionable material has been powdered with this flour of copper the composition will not stick or adhere to the cut, half-tone, or form when making an impression. Furthermore, Ihave found that this flour of copper will also prevent the composition, or rather the impressionable material, from spreading when an impression is made, and by the employment of the powder or flour of copper made as set forth the objection to the ordinary bronze powder of commerce is overcome, as it is a well-knownfact to electrotypers that when the ordinary copper powder of commerce is employed it often slips, breaking the lines of the impression off, necessitating partly filling up of the lines or dots with molding-lead, and when the lines are in such condition the cuts or half-tones are not clear and sharp as they vwould be if molded clean With the powdery IOO gritty, and consequently it would be injurious to the case, which is evident, owing to its gritty nature. Therefore it is necessary that such copper powder should be sifted and the siftings be rendered impalpable to form what I have termed flour of copper, which pos sesses the following characteristics: that it is not gritty, will 4not slip, and will preventwhen used in the manner as hereinbefore set forth the sticking, slipping, or spreading of the irn pressionable composition of the case While the impression is being made from the half-tone, cut, or form.

Having thus fully described my invention, what I claim as new, and desire to secureby Letters Patent, is-

1. A process for manufacturing molding-4 cases for use in electrotyping, consisting of casting an impressionable composition, coating the said composition with flour of copper, forming an impression in thesaid composition, subjecting the impressed composition to a black-leading machine, and then subjecting it to an electrolytic bath.

2. A process for manufacturing moldingcases for use in electrotyping, consisting of sition, coating the said composition with flour of copper, forming an impression in the said composition, subjecting the impressed composition to a black-leading machine, and then subjecting it to an electrolytic bath.

3. As a new article of manufacture, a molding-case for use in electrotyping obtained by casting an impressionable composition, coat ing the said composition with flour of copper, forming an impression in said composition, then subjecting it to a black-leading machine, and then to an electrolytic bath.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

' WILLIAM H. WELSH.

Witnesses:

CHARLES R. STEvENsoN, ELsIE G. RoDGERs.

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