US36589A

US36589A - Improvement in wipers for blackboards

Info

Publication number: US36589A
Authority: US
Publication date: 1862-09-30
Anticipated expiration: 1879-09-30

Description

UNITED STATES PATENT OFFICE.

PHILANDER PERRY, OF WATERFORD, ASSIGNOR TO HIMSELF AND EPHRAIM H. BENDER, OF ALBANY, NEW YORK.

IMPROVEMENT IN WIPERS FOR BLAVCKBOARDS.

Speciiication forming part of Letters Patent No. 36.589, dated September 30, 1862.

To all whom, it may concern:

Beit known that I, PHILANDEP. PERRY, of Waterford, Saratoga county, State of New York, have invented a new and useful article of school stationary for the purpose of a slate and blackboard wiper; and I declare the following specification, with the drawings connected therewith as a part of the saine, to be a fulland perfect description of my invention. Figure l represents the article as prepared for a blackboard-wiper, and Fig. l2 for a slatewiper.

In Fig. 1 a portion of the covering is shown as removed to exhibit the illing material.

A is an oblong piece of wood, likea clothesbrush handle, of convenient size for handling, say eight inches long, three and and a half wide, and one inch thick. This is to be covered by a piece of canton-tiennel, (cotton) B, or like material, secured to itby nai/ling along the edges at O, or any other con'venient mode of attaching it, leaving al space for a stuffing or filling, S, between the .wo/od and cover of about three-quarters of'an` inch or au inch. This stufng or filling is composed of wood shavings crushed by manipulation, so as to form a friable mass of some elasticity, together with clippings of woolen cloth, and for certain purposes with small bits of sponge. The proportions of these materials may be about equal quantities of shavings and cloth' mixed together. The sponge,whieh is to be put in whenever the rubber is to be wetted, and` and below it at E E, the one side to be filled with shavings and cloth described, the other with cloth and sponge, this latter to be moistened to wash the slateand the other to be used as a drier.

Blackboard-rubbers now in use are simply oblong blocks covered with sheepskin, the

wool outside, or with buckskin. rlhis leather covering soon becomes charged with chalkdust, so that after a short time of use instead of fairly cleaning the board it simply covers it with a gray coat, upon which writing becomes both difficult and illegible. Besides, the coverin g operating, as it does, between two unyielding surfaces, nothing but a leathery substance would last any time for a rubber, and even that wears rapidly ont, requiring-frequent covering to the blocks. The lling-in employed within my rubbers by its elasticity relieves the pressure and rcdu ees the abrasion, permitting the use of cloth covering, which is a cheaper and better article. Further, the cloth (cotton) covering, from itspeculiartexture, carries off the particles of chalk 'from the board or slate, instead of grinding it down upon the surface, as does leather. It also allows the use of moisture to clean the board or slate.

Moisture soon rots leather covering, being long retained by it, and not evaporating readily from its pores as from cloth, an important advantagein favor of cloth. Ithercfor'e allege that I produce a more endurable, serviceable, and effective wiper than has ever yet been made, and one that, from the eheapness of its material and construction, meets the wants of common schools as a part of its economical apparatus, and is within the reach of all com posed of prepared shavings and clippings of cloth, with or without pieces of sponge, substantially as described, and for the purposes set forth in the within specieation.

FHILANDER PERRY.

Vitnesses:

E. F. BULLARD, JNO. H.' DENNIs.