O is a racket-wheel on the cylinder, to prevent a retrograde motion in the chain. Fig. 2. shows, upon a larger scale, the manner in which the box K above mentioned loads the buckets. P is an iron tooth projecting from the endless chain, which, pressing upon the catch R, underneath the box K, occasions that part of the box next the chain to sink down, and discharge into the bucket beneath it a quantity of ore sufficient to fill it. As the loaded bucket rises, it lifts the box K to its former place, till the operation is repeated by the next tooth upon the chain. The model remaining with the Society contains two machines put in motion by the same power, one of which is for raising ore, the other for clearing mines from water. The machine for raising ore was the object for which the Bounty was given; therefore only that part is engraved and described. The Sum of FIFTY POUNDS was this Session voted, as a Bounty, to Mr. FIELD EVANS, of Pool-Quay, Montgomeryshire, for the Discovery of a Quarry of BURR-STONE proper for Mill-stones, from whom the following Account and Certificates were received, along with a pair of Mill-stones. SIR, BEING informed that the Society for the Encouragement of Arts, &c. had offered a Premium to the person who should discover a quarry of stone fit for the purpose of Mill-stones, and of the same quality as French Burrstones, and having myself discovered such a quarry, in a hill called Moel y Golfa, in the parish of Buttington, in this county, I have accordingly sent a pair of Mill-stones to the Society, before whom The following Certificates accompanied this letter, viz. from Mr. Henry Gardner, mill-stone manufacturer, Liverpool, dated the 1st of March last, stating, that he had manufactured into mill-stones several tons of the Moel-y-Golfa-Hill Burrstones, and believes them to be a good substitute for French Burr. From Elisha Williams, dated the 29th of April last, of the parish of Erbistock, in the county of Denbigh, stating, that he had used a pair of Burr mill-stones from |