. Scientific American Volume 51 Number 15 (October 1884) . y a nut. The brace locks behind a shoulder formed at theupper edge of the head of the key, which may be more surelyprevented from turning by having its lower shoulder mor-tised in the face of the post. The seat is mounted upon asuitable spring fastened by bolts to a sliding block, F, be-tween which and the spring is a wooden block. Each slid-ing block—a similar device is placed at the other side of thebody—is fitted to slide back and forth upon the upper barof the bracket (as shown in the cross section. Fig. 8), and isheld in any posit
. Scientific American Volume 51 Number 15 (October 1884) . y a nut. The brace locks behind a shoulder formed at theupper edge of the head of the key, which may be more surelyprevented from turning by having its lower shoulder mor-tised in the face of the post. The seat is mounted upon asuitable spring fastened by bolts to a sliding block, F, be-tween which and the spring is a wooden block. Each slid-ing block—a similar device is placed at the other side of thebody—is fitted to slide back and forth upon the upper barof the bracket (as shown in the cross section. Fig. 8), and isheld in any position by one or more set screws. To throw the seat forward, as indicated by the dottedlines, it is lifted at the back until the upper ends of the slotscan pass over the shoulders of the keys, when it may beswung over as indicated by the dotted lines. In swingingthe seat back into position for use the slots will pass overthe heads of the keys, and a little greater down swing of theseat will cause the ends of the slots to fall, and lock behind ^^■■Xx. MILLERS WAGON SEAT. the shojlders. By removing the hinge pins the seat andbrackets may be lifted from the wagon. This invention has been patented by Mr. Alonzo Miller,of North Adams, Mass. ^ » Photographic FOR REDUCING OVER-INTENSE NEGATIVES. At a recent meeting of the New York Society of AmateurPhotographers, Mr. Newton called attention to the danger ofthe injurious action of hyposulphite soda, contained in thedividing paper frames, upon gelatine plates as they are atpresent put up and sold. He exhibited several specimens in which the deleteriousaction of the chemical was distinctly visible. The generaleffect was to fog the edge, and frequently the whole of theplate, and thus seriously injure it for future use. Asa rem-edy, he suggested that the plates be packed in tin or metalboxes, or that the division frames be varnished or shellacked,which would in a measure counteract any injurious effectof the chemicals
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