June 17, 1881. THE ENGINEER. 439 purification of middlings is effected by the pressure of Trade, and by Mr. Kincaid, Mr. Brett, and other engi ­ THE MILLING EXHIBITION. wind underneath lifting the fibre as the screen frame neers, contains interesting information on this subject, that No. YI. agitates it on the surface. It cannot possibly get through given by Mr. Kincaid being especially valuable in com­ Having described the complete system exhibits, we pass the silk. The finer is carried upward, the coarser goes paring the experience gained in different countries where Oil to those not claiming to be complete exhibitions of over the tail. Messrs. Whitmore also exhibited a well- tramways are working. systems, but still showing different processes for reducing designed 6-reel bolt chest, Fig. 51 ; the reels are placed There have been no less than three tramways Acts for and dressing wheat and middlings. Stand No. 32, was the alternately head and tail, thus making several conveyors en­ Ireland, viz., 1860, 1861, and 1871, and now a fourth has joint exhibit of Messrs. W. Gardner, Gloucester, and Lam- tirely unnecessary ; also small millstones for grinding been introduced into Parliament, and has been referred to pitt and Sons, Warwick. On the ground-floor of their stand middlings, and sundry other milling articles of their well- a Select Committee, who are taking evidence which con­ a number of two-roll porcelain roller mills were exhibited known manufacture. tains interesting information and points for consideration. in motion. These machines are manufactured by Next to Messrs. Whitmore and Binyon ’s stand was that The objects of the Bill are fourfold : (1) To raise the Beyer Freres, of Paris ; they are simple, are belt-driven, of Messrs. A. B. Childs and Sons, who exhibited a fine limit of tolls fixed by the Act of 1860 for the carriage of without gearing, and a novelty in the feed gear is intro ­ collection of Wegman ’s porcelain rolls. Some of these goods ; (2) to increase the limit of speed ; (3) to remove duced. The usual feed-roll is discarded, and the feed is were illustrated in The Engineer , page 61, July 25th, some legal obstructions that are found to exist in working effected by the direct draw in of the rollers. The bearings 1879, and page 346, May 13th, 1881 ; but some improve ­ under the Act of 1861 ; (4) to relax the restrictions con ­ are well lubricated, and the level of the oil can be seen ments have been introduced to meet the various require ­ tained in the Acts of 1860 and 1871, by which the tram­ from the outside ; the framing is very strong, and cast in ments of millers. One, Fig. 57, is driven by one belt way must be laid approximately in the centre of the road, one piece. A single screw acting on a spring sets the passing over the two roll pulleys and two intermediate and level with its surface. movable roller closer or further from the fixed one ; two “ idlers.” The belt is kept tight by springs, operating on The maximum tolls authorised by the Tramways — adjusting screws are provided at the back of the machine forked idle pulley carriers, the stems of the forks being Ireland—Act, 1860, are limited to from Id. per ton per to keep the rolls parallel with each other should the carried by socket brackets c, adjustable as to angle by mile and upwards, according to the class of goods carried ; bearings wear unequally. The rolls are run at differen­ nuts d, and as to height by the hand-wheels b b, shown in but in the Tramways Act of England there is no such tial speeds of two to three, the driving roll running at 300 the engraving. Mr. Child has been an energetic advocate limit, and the Provisional Orders issued under that Act per minute. Messrs. Beyer make these rolls of porcelain of the porcelain rolls for many years. In the exhibition authorise a toll of 3d. per ton per mile and upwards for or chilled iron, preferably the former. Another of these he showed a very compact Millot ’s purifier and a self-acting similar goods, and on some tramways the toll is authorised roller mills, with two rollers on each shaft and a recipro ­ lathe for fluting either porcelain or chilled iron rolls. This as high as Is. 2d. per ton per mile and upwards. It is cating end-ways motion, was exhibited. On the upper lathe, which is shown in Fig. 58, was at work during the obvious that the toll of Id. per ton per mile would not pay floor were the dressing machines—a four-reel bolt-chest exhibition on iron rolls. on tramways, and the alteration proposed in this restriction with variable incline to each reel. An improved silk cen­ Mr. F. Nell, of Mark-lane, London, Stand No. 13, showed is one of the most important objects of the Bill. The trifugal, had a wrought iron trussed reel and Thompson amongst other things the Excelsior Purifier. A special comparatively small quantity of goods to be carried, and and Lampitt ’s Acme roll bars for the better distribution of feature in this machine is the arrangement for keeping the the heavy gradients over which they must be hauled the flour and to ensure its proper progressive motion to the silk sieves clean by means of india-rubber balls, shown in requires a higher toll than that fixed for railways to tail of the reel. These bars are shown in Fig. 52. Mr. Fig. 59. Across the bottom of the sieves coarse wire-cloth give a profitable return over working expenses. Mr. Gardner also exhibited a Smith’s circular stone staff—a is stretched to the framework, and in compartments Kincaid’s argument is that as the cost of cartage along very carefully built-up ring of wood, got up to a true sur­ formed by the frame of the sieves are placed india-rubber the roads is generally in Ireland from 6d. to Is. per ton per face for dressing millstones. balls of such size as will freely play in the space between mile, the charge on the tramways should be limited to On the next stand, No. 31, that of Messrs. Munden, Arm- the wire and the silk without rubbing the latter. The something below this, say 4d., so that under any circum­ field, and Co., of Kingwood, was a novelty in silk dressing motion of the shaker, together with the rough surface of stances the district would get the benefit of lower rates, reels. In addition to the usual revolving motion, the reel is the wire-cloth, causes the balls to jump and dance about in and the maximum rate chargeable would be specified in caused to reciprocate rapidly backwards and forwards in all directions, thus jarring the silk and keeping the meshes the Order in Council for each case. the direction of its length, to give a better sifting action to free and open —a very simple and, we should think, effec­ The speed authorised by the Act of 1871 is limited to the reel; each bar of the reel carries vanes to receive the tive device. Another feature in this purifier is shown at three miles per hour in towns and six miles in the country, meal on its upward course and distribute it on the down ­ L in the section, Fig. 60. The middlings enter at the hopper and this it is proposed to raise to eight and twelve miles ward side of the reel, thereby causing that side of the reel A, pass down the spout M on to the detacheurs L, con- respectively. As the Board of Trade have authorised a to dress as much as the upward side. This Fig. 55. speed of eight miles per hour in such towns machine, shown in Fig. 53, was thoroughly well as Bristol, Glasgow, Sunderland, and Dews­ made, and worked very steadily, the crank shaft bury, this alteration does not appear un­ for giving the reciprocating motion being carried reasonable. The third alteration to be in strong iron brackets. Messrs. Munden, Arm- 4! effected by the Bill does away with the necessity field, and Co. also showed a small cheap por ­ of having the Order in Council confirmed by Par­ celain roller mill, bran dusting, and sundry II liament in the case of an unopposed Order, other milling machines. £ thereby simplifying the proceedings, and con­ Adjoining this stand was that of Messrs. J. siderably shortening the period required between the first application and the final authorisation Walworth and Co., of the Albert Works, Brad­ i assail ford, Stand No. 33. Fig. 54 shows in section II of the project. one of Messrs. Walworth ’s aspirating purifiers, ■Rip 1 It is certainly remarkable that every tramway and affords a good example of the machines ml in Ireland is authorised by special Acts, although under the fourth division of the classification IBIIeszIi three Acts of Parliament have been passed (Engineer , p. 345, May 15, 1881). The arrows \w which would apparently obviate the necessity show the direction of the air currents drawn in of incurring such expense. The Lord Lieutenant by the fan Z. The middlings are fed in by the in Council is empowered to authorise a tramway feed roll at the bottom of the hopper K, fall on in a similar manner as the Board of Trade is to the system of inclined planes P Q S T V, meet­ empowered under the Tramways Act, 1870, and ing the air currents, those particles too heavy to be jfjgjl i yet we find that although in England the Provi ­ drawn upwards through the passages EVWXY, sional Order issued by the Board of Trade has fall on to the sieve below, and the lighter pass been found quite satisfactory, the Order in Coun ­ on with the air into the large chamber A.