As the inventor says, the title of “pulley” is a misnomer, the device being simply a segment—one half—of a pulley; but the object intended is that attained by the ordinary revolving pulley. The engraving shows the stile of a window frame, containing a semi-disk, or half circle, made of glass, groved on its periphery to receive a cord ,and having enould-ers, or rebates, on its sides and on the bottom to hold it in place. The glass segment, A, is'set in a mortise through the stile, B, and a similar butnarrower mortise—to conform to the reduced thickness of the segment—in a, bracket or supplementary stile, C. The dotted lines at D show a thin plate of metal screwed on the window frame to conceal that portion of the mortise necessary only to admit the glass segment. No screws, pivot, plate, or recessing, beyond the slot through the stile, necessary for ordinary pulleys, are required; the segment being merely passed in from the front, and then being held securely by the ledges on its sides and bottom resting against the sides of the mortises. - The cord sustaining' the window weight merely slides in the groove of the segment over the smooth glass surface, and thus all creaking of pivots or axles, so annoying to the ill or nervous, and all necessity of occasional oiling is obviated. The inventor claims the following advantages : Simplicity in construction and application; non-liability to derangement, no screws; no letting in of face-plates; less expensive than other devices; greater friction on the cord, but less wear, requiring a less proportionate weight to balance the sash, and giving a longer life the cord; no rusting, and always in order, not being affected by the weather. This device was patented through the Scientific American Patent Ag ncy, Nov. 3,1868, by Alfred Bicknell. For further information, address American Glass Pulley Company, 56 Congress street, Boston, Mass. Another Balloon Project We received a call the other day from Monsieur Chevalier, of France, who heralds himself as a distinguished aeronaut. His object in coming here is to perfect his improvements in balloons, and to raise funds to make an experimental trip across the Atlantic ocean. He has brought a balloon with him in which he proposes to make the return trip to Europe. It is 95 feet in hight, 150 feet in diameter; capacity for gas, 125,000 cubic feet. The car, made of bamboo, resembles a long bamboo hut. M. Chevalier wishes to start before the warm months, so that his balloon may not be affected by the hot sun. It is his purpose to rise to an altitude of 10,000 feet, where he believes he will enter a steady current running eastward, and thus by it be conveyed to the continent of Europe. We wish Monsieur Chevalier success. Improved Machine for Pressing Bricks The use of bricks as a substitute for stone for building purposes is almost as old as written human history. Even the burning in the kiln, which was probably preceded by simple drying in the sun, is of very great antiquity ; for we read in Genesis XI. 3, the agreement of Noah's posterity when they planned the city and tower of Babel: " Go to, let us make brick and burn them thoroughly." From that remote period to the present time the manufacture of bricks has been an important branch of the industry of civilized peoples. Yet until within the memory of the present generation, Indeed, until -within about thirty years, the machinery for- pusparmg the clay and the methods of forming the bricks were of the simplest and crudest sort. The successful combination of the pug mill and press, in 1839, marked an era in brick making, and although successive attempts have failed to produce perfect bricks, in some instances, the-evidence that a superior article cam, be and lias been made by machinery is too positive to admit of doubt. The accompanying engraving represents a press that produces a very elegant article, which appears to be all that could be desired in this building material. The machine is known as the Niagara Brick Press, and is the subject of six different patents, dated, respectively, Oct. 23,1866, March 12 and 26, and Aug. 27, 1867, and Jan. 7, and Feb. 11,1868. It is a horizontal piston machine, " double-ender," .pressing and delivering three bricks at one end and then three at the other end, six bricks to one revolution of the wheel. It has a simple crank movement. The pistons are perforated, and the surplus clay, air, and moisture, escape through these perforations, in the act of pressing. The material used is moist clay; this is considered preferable to dry clay, although the machine will produce very excellent bricks from dry material. The bricks are very solid, perfect in form with well defined edges, of uniform size, of grainless density, breaking true and square to the trowel. The exposed surfaces (edges and ends) are perfectly smooth, highly polished, and glazed, rendering them impervious to moisture and not liable to discoloration by the action of the elements. From the specimen before us, sent as an average brick (in fact, it is claimed that their uniformity makes a selection impossible), we consider the product all that could be desired. The numerous testimonials from architects, masons, and builders, who have used them, and the fact that the company have on hand very large orders for brick to be delivered in the spring, would seem to give reason for the following apparently sweeping claims made by S company owning the patents and conducting the manufacture: " 1st, Perfection of form, being perfectly true and square, with well-defined edges and angles, and of greater specific gravity than others, rendering them capable of being laid with less labor, to a closer joint, and producing more solid, stronger, and handsomer work; 2d, beauty of finish, the exposed surfaces being polished or glazed, impervious to moisture, and not liable to discoloration or stain from dust, smoke, etc.; 3d, great strength and toughness for resisting strain or pressure; 4th, without grain ,allowing them to be cut into moldings, or to any desired form, without waste ; 5th, durability, not being injuriously affected by the action of the elements; 6th, adaptability to any particular service where bricks are used; 7th, made of moist tempered clay, and having all the good and none of the objectionable qualities of the mud bricks; 8th, can be manufactured at all seasons and in all weathers ; and 9th, they are superior to other bricks, and can be produced at less cost." The machines are made of different sizes. The capacity depends, of course, on the speed with which they are worked. A No. 1 machine requires an engine of from fifteen to twenty horse power to drive it; and will produce from 15,000 to 35,000 bricks per day, according to kind required, whether " Fronts " or " Common." Machines, State, county, and yard rights for sale by D. P. Dobbins, Sec, Niagara Brick Press Co., 346 Main street, Buffalo, N. Y.
This article was originally published with the title "Bicknell's Patent American Window Weight Pulley" in Scientific American 20, 8, 116 (February 1869)