US269219A - Third to alex - Google Patents

Description

PATENT OFFICE.

MARK W. MARSDEN, OF PITTSBURG,

PENNSYLVANIA, ASSIGNOR OF ONE- THIRD TO ALEX. MATQ JHE'I'T, OF SAME PLACE.

PLASTERING COMPOUND.

SPECIFICATION forming part of Letters Patent No. 269,219, dated December 19, 1882.

Application filed October 13, 1882. (No specimens.)

To all whom it may concern:

Be it known that 1, MARK W. ll/IARSDEN, of Pittsburg, in the county of Allegheny and State of Pennsylvania, lJaXB invented a new and use- 5 ful Improvement in Plastering Compounds; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention is directed to the production of a plaster or plastering compound which 10 will be more adhesive, more elastic, warmer, tougher, lighter, and cheaper than ordinary plaster, and whichca-n be used over again. I obtain such a plaster by a composition of paper or wood pulp, clay or mineral powder, and

I5 paste or sizing. The paper or wood pulp is the same as that used by paper-manufacturers in the manufacture of paper or of strawboard. For ordinary plastering the vegetable pulp is of the cheapest kind. The mineral pow- 2o der used is made of soapstone, terra-alba, or

other suitable clay. The paste or sizing used are of the cheaper kinds used by paper-hangers, calciminers, and whitewashers. For finer work the better and more expensive varieties ot'these 2 5 materials are used.

I can make my improved plaster either for hard or forsoft, pliable, or elastic walls. For hard walls I prefer to use the following or about the following proportions, viz: vegeta- 0 ble pulp, one-third; mineral powder, one-half; Y sizing,one-sixth. Theseingredients are placed together in a box and mixed with sufiicient water to give them the consistency of mortar. It is then applied to the wall in the usual way. 5 For soft or elastic walls I usethe following or about the following proportions, viz: vegetable pulp, three-fourths mineral powder, oneeighth; sizing, one-eighth. If it is desired to render the wall fire-proof, I add a small per- 0 centage of common salt or equivalent sub- |stancessuch as soda or pearlash-which,

when exposed to the heat caused by a fire or against the wall, will produce an extinguishing-gas. Coloring-matter may also be added if it is desired to color or tint the wall. The vegetable pulp which I prefer to use is dry wood pulp, because it mixes up better and smoother than other pulps, and is of a fine adhesive body. The mineral powder gives body to the mass and acts as a hardener.

The advantages of my improved plaster are that it is cheaper than the ordinary plaster, as it does not require to be laid on the wall so thick. It is warmer, because it is a better non-conductor. It is more healthful, because no animal hair is used in its composition. It is more tenacious,and,beingofahomogeneous,fibrous,

by grinding it up it can be used over again.

1 am aware that it has been proposed to use vegetable fiber in connection with lime, putty, and other ingredients in the manufacture of non conducting boiler coverings, tire brick, roofing-tile, and similar uses, and I make no claim for any such things; but

What I do claim isl 1. A plastering compound for the walls and ceilings ofhouses, composed of vegetable pulp, mineral powder, and sizing, substantially as and for the purposes described.

'2. A plaster composed of vegetable pulp, mineral powder, sizing, and salt, substantially as and for the purposes described.

In testimony whereof I have hereunto set my hand this 5th day of October, A. D. 1882.

MARK W. MARSDEN.

Witnesses:

T. B. KERR, J. K. SMITH.

tough structure, will not chip or scale ofifand