draw in and throughout the chops IIII at discretion, the chops having been previously connected to the plates by the two binding screws K K to each chop. Upon each plate are placed a corresponding number of cocks, pushing and drawing screws, with binding screws and chops, all of which are stationed directly opposite to each other on each plate, and at their respective situations. Between each pair of opposite chops IL are: placed the fluted rollers N N N N, of box wood, or other suitable material, having square holes through them into which pass the roller bolts O000; these bolts, although square on their shanks, are yet round about one inch from their shoulders, and they are also round about the same length at the termination of the shanks; imme-diately after which they are screwed to the length of about one inch, upon which the nuts PPPP fit. The roller holts, with the fluted rollers upon them, are enabled to turn in the chops I L, which produce the advantage of presenting the whole cylindrical surface of the rollers NN. NN to the action of glazing, by which means the whole of the surfaces of the rollers are brought into use as fast as any particular part becomes too much worn. These rollers are fixed firmly between each pair of chops I L, by the screw nuts PPPP being screwed upon the roller bolts O O O O up against the chops LLLL.

Fig. 3 represents the roller, its bolt, qut, collet, and its two box-wood blocks: the diameter of the roller may be of any convenient size; we, however, have found that from six to three inches answers better than either larger or smaller sizes, because a larger diameter would not only be difficult to procure in boxwood of proper quality, but a larger diameter would possess too great a leverage, which would be liable to

make

make the bolt turn in the holes of the chops when any considerable pressure was applied to it; and a smaller diameter than three inches would require not only too great a range of adjustment in the chops, but would also approach too near to the extreme of the ends of the chops, which circumstance would be liable to endanger the leather while glazing, by entangling it, or by scratching and injuring its surface. The roller N may be made of any length not exceeding six inches; but we have found, by repeated experience, that two -inches long answers better than any length we have yet tried, although every length, from six to two inches, we have submitted to the test of frequent trials. The distance between the external surfaces of the plates is about six inches; full one-third of which distance is occupied by the glazing roller, and the other four inches, or two thirds of the space, are filled with the two plain boxwood blocks QQ to the diameter of three inches, when the glazing rollers are not more than three inches and a half; this is the least possible difference in the diameter of the blocks and rollers that can be admitted. The two blocks QQ with the fluted roller N form together a length equal to the whole distance between the chops IL. The blocks not only save a great expense in the rollers, but also possess the advantage of ranging the rollers upon the plates so as to take six inches of the width of any skin of leather in one revolution of the roller-shaft, as well as being able thereby alternately to use any two inches of the width of the table that are opposite to the distance which the roller-plates E E occupy. When the roller-plates EE have six rollers mounted on them, three of them may be used for the operation of rolling on, and three of them for rolling off

with; in that case, when the operation of rolling on is performing, it will be necessary to draw back the rolling off rollers, and so vice versa when the operation of rolling off is required; in that case it will be better to make the rolling on rollers travel in a different channel to the rolling off rollers, which is an advantage obtained by the introduction of the blocks QQ; besides, by shortening. the rollers NNNN, a more considerable pressure of course can be applied against them than if they occupied a greater length. In making the rollers it will be necessary to observe, that they must be rounded a little on each edge from the main diameter, to prevent their cutting, creasing, or indenting the leather while the operation of glazing, graining, or finishing is performing.

Fig. 4 is a section of the curved table A, or segment of a cylinder of about 90 degrees, more or less, made either of hard wood, brass, iron, or any other suitable material, and of any convenient radius adapted to that of the rollers when they are attached to the main shaft BB, as in Fig. 2. The width of the table A may be 10 inches, more or less; and although the table A is 90 degrees of a circle, yet we have found it of the utmost importance that about five or ten degrees, both at the top and bottom of the table, should be gradually eased or tapered off, which introduces the glazing rollers gradually and freely upon the leather when it is placed on the table, which, with the assistance of the table guide or stop, completely prevent the glazing rollers creating any injurious indentations and marks by the violence which otherwise would be occasioned by a sudden and abrupt contact with the table. By the rollers being allowed to quit the table in an easy and gradual manner, all effort there

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