US169649A - Improvement in blackboard attachments - Google Patents

Description

HQ B. MARSHALL. BLAGKBOARD ATTACIIMENT.

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HORACE B. MARSHALL, OF KINGSTON, ASSIGNOR TO GEORGE H. ALLEN, OF

" AYER, MASSACHUSETTS.

IMPROVEMENT IN BLACKBARD ATTACHMENTS.

Specification forming part of Letters Patent N0. 169,649, dated November 9, 1875; application iiled" April 13, 1875.

To all whom it may concern:

Beit known that I, HORACE B. MARSHALL, of Kingston, county of Plymouth and State of Massachusetts, have invented certain Improvements in an Attachment to a Blackboard or Blackboard-Trough, of which the following is a specification:

The invention consists in the application. of Wire-netting'or netting of any substance (used for the purposes herein set forth) to black` boards or blackboard-troughs, as a receiver for crayons or any other. substance used for marking upon blackboards; also, as a receiver for erasers, and for cleaning the same.

The object of the invention isto providea more convenient receptacle for crayons, in4

which they Will be separated from the dust which usually collects in considerable quantities in the trough of a blackboard. Another object of the invention is to prevent the dust arising from the use of crayons upon blackboards from being scattered upon the door of .the room, or through the atmosphere of the room, to be inhaled by the occupants thereof.

'A further object of the invention is to serve 'as a receiver for erasers, and a cleaner for the same.

A view of the -crayon-receiver and erasercleaner is shown in the drawings which accompany this specication. I describe the drawings as follows:

In Figure 1, A represents a blackboard; B, the wirejlnetting; D, a blackboard-trough; and F E, buttons attached to the blackboard and fitting into button-h oles in the wire-nettin g.

In Fig. 2 there is substantially the same view of the blackboard and attachments, and the parts are respectively designated by the same letters as in Fig. l', with this addition, that in Fig. 2 E represents a movable receptacle'or trough in process of being removed from the stationary trough I). Fig. 2 also represents the Wire-nettin g B as turned back to admit of the removal of the trough E.

The Wire-netting B, as represented in Figs. 1 and 2, is concave, this being the most conthe butts G G. B might be attached directly by butts or otherwise to the trough D, or even to the movable trough E. The Wire-nettingN or crayon-receiver B is held in place by the buttons F F. The crayons or erasers are placed on the receiver B. The dust caused by marking, or by the erasure of marks upon the blackboard A, falls through the meshes of the receiver B, and is collected in the trough D, or in the movable trough E, if it is used.-

The blackboard eraser being illed with dust from constant use, by being rubbed along the meshes of the receiver B is i'reed from dust, which passes down into the receptacle beneath.

In Fig. 2 the crayon-receiver B is represented as turned back, for the purpose ot' re moving the movable trough E.

Other substances and devices besides Wirenetting might be used for the crayon-receiver and eraser-cleaner, such as metal or Wood, perforated, or pieces of Wood or metal laid transversely across the trough D; but.wirenetting being cheap and durable, is preferable to anything else for the purposes for which the receiver is designed.

I do not claim the trough D, as in various forms itis in universal use. I am not part-icular to claim the movable trough E, although as an attachment to a blackboard-trough I think it is new.

What I claim, and desire to secure by Letters Patent, is-

In combination with ablackboard-trough the netting B, to form a receiver for crayons and a cleaner for erasers, substantially as described, and for the purpose set forth.

HORACE B. MARSHALL.

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