1200 THE COLLIERY GUARDIAN. June 6, 1913. gained therein, the Siskol drill has been entirely remodelled. An entirely new type of cradle has been introduced, and the ring type of chuck originally used has been discarded. The front end of the cylinder is now made in two parts, and provision is also made for very easily taking up wear in the cradle, and the weight of the drill increased to 130 lb., with a corresponding strengthening of the various parts. For development work the Siskol drill is made in two larger sizes of 3 in. and 3f in. cylinder diameter respectively. The “ Siskol ” coal-cutter is even better known in this country and is a singularly adaptable machine. The illustration given herewith shows a machine adapted to seams from 18 in. and upwards in thickness, which has been used successfully on a longwall face in a seam less than J yard in thickness, with extremely good results. Seven to 8 yards can be holed at one fixing, after which it is an easy matter to flit the machine intact when fixed Low-Pressure “Siskol” Coal-cutter. (International Channelling Machines Company.) Low Type “ Siskol ” Coal-cutter. (International Channelling Machines Company.) on a sledge or plate as depicted on the illustration. In this way it is possible to hole a place 30 yards wide with four settings of the machine, and as only a few minutes are needed to loosen the column, flit the machine and reset, practically the whole of the shift can be occupied in cutting. A further illustration shows a low-pressure “ Siskol.” This machine, which in all respects is similar to the standard machine, but on a correspondingly larger scale, has cylinders of 4 in. and 4J in. respectively, and extremely good results are obtained with air pressures as low as 30 lb. per square inch. STEWARTS AND LLOYDS LIMITED. Messrs. Stewarts and Lloyds Limited, of Nile-street, Birmingham, have a large stand laid out in decorative fashion to display their various makes of tubes and fittings. These include lapwelded wrought iron and steel pipes and fittings, sizes 48 in. to fin.; loose flanged pipes and fittings for the conveyance of compressed air; loose flange joints in section showing construction; steel high-pressure steam pipes with welded branches and flanges; steel pipes 48 in. to If in., with the well- known inserted joint for carrying water, sewage, gas, &c.; steel pipes with welded joints, showing Stewarts and Lloyds’ patent method of welding together long lines of pipes; joints for water, &c., pipes shown in section; steel “ Lockbar ” pipes 72 in. to 15 in. in 28 ft. lengths, with lead and yarn collar joints; various specimens of electrically-welded branch pipework ; model boiler with installation of pipework; lapwelded and solid drawn boiler and stay tubes; Perkins hot-water pipes and fittings ; high-pressure hydraulic pipes and fittings; coils, steel castings, &c. THE YORKSHIRE ENGINE CO. The Yorkshire Engine Co., of Meadow Hall Works, show a compact type of portable haulage engine with double drums having Sin. by 8in. cylinders. The special feature of this engine is that dismantling of the engine is obviated under most conditions on account of the extreme compactness of the design. It is interesting to note that for the engine exhibited the working space required is only 3 ft. 6 in. wide, 3 ft. 6 in. high, 4 ft. long. Manipulation is singularly easy, reversing, starting, and stopping being effected by one handle. There is an absence of complicated valve gear. The gearing has machine-cut teeth, the pinion being solid forged steel, whilst the glands fitted with metallic packing. The rope capacity is large. The same firm show their latest type of horizontal semi-portable haulage engines, with single and double drums having 6 in. by 9 in. and 9 in. by 12 in. cylinders. These machines have massive side frames cast in one piece, accurately machined to ensure correct alignment even after constant dismantling. They are provided with extra strong and broad-faced gearing. Oil lubrica- tion is used throughout. Two powerful brakes lined with “ Ferodo ” fibre are applied to each. W. AND J. RICHARDSON. This Derby firm, one of the oldest in the country, their establishment dating back to 1624, are specialists in all classes of leather for colliery work. They supply a pit pony guard which may be fitted to any bridle, and must be one of the cheapest on the market. The stand also contains various examples of high-grade leather belting, &c. THE WILFLEY MINING MACHINERY CO. The Wilfley Mining Machinery Company Limited, of Salisbury House, E.O., have two exhibits-—the Wilfley concentrating table, over 17,000 of which have now been installed, and the Hardinge conical mill. In the Hardinge mill the crushing bodies arrange themselves with the largest and heaviest at the greatest diameter, graduating to the smallest and lightest at the least diameter. Coarse material entering the mill is imme- diately subjected to the impact of the greatest crushing force, and continues through the mill, being reduced in contact with grinding material, decreasing in size proportionately with diminished diameter of cone until discharged to a uniform fineness at the outlet. Thus the grinding medium is automatically adjusted or classified to the work to be performed. JOHN DUGDILL AND CO. Messrs. John Dugdill and Co., of Failsworth, near Manchester, show a variety of movable electric light fittings and accessories. MANLEY AND SANDY. Messrs. Manley and Sandy show their electric miners lamps fitted with detector. The indicator is based on the well-known catalytic properties of platinum ; but platinum wire is not used in the detector. In its place a wire of a metal alloy is used, having a very low tem- perature coefficient which is coated with platinum in such a way that the surface is carbonised and the platinum itself left as a highly porous granulated coating carrying no portion of the current, but brought to its most efficient temperature by the heating of the internal conductor. By this means external temperature or degree of moisture in the atmosphere has no effect on the working of the instrument. so .X;? I Miners Electric Lamp, with Indicating Device (Manley & Sandy.) In pattern B the detector is fitted on the upper part of the miner’s lamp and is protected by a strong metal dome, into which gauze windows are fitted, a glow being seen inside when a predetermined percentage of gas is present. Pattern A is also fitted with a visual indicator inside the glass, showing gas in any fractional propor- tion directly on a dial. Other forms have the detector fitted on to a cable, so that while the detector may be placed in a hole or other position, the indicator itself may be carried in the hand or on a belt, as is found most convenient. HANN AND INGLE. Messrs. Hann and Ingle (13, Albert-place, Bridge- street, Manchester) show examples of their adaptable earthing and bonding clip. The principal feature of this clip is that it can be adjusted to fit any size cable, &c.,- the copper tape which passes through the slots being cut off to length, according to the size of cable, conduit, &c. The No. 3 clip is an extra large size; the carrying capacity may be increased by passing additional thickness of tape through the slots of clip. LEGARD AND SON. Messrs. Legard and Son, Barnsley, show the “ Pon- guard ” eye and head shield for the protection of pit ponies. This guard, which has been supplied to a number of large Yorkshire collieries, appears to be a serviceable and humane appliance, giving the maximum of protection and of accommodation to the pony. In one form it is made with a 1 in. or lJf in. chole band with straps and bit, and in another with lj in. chole band with nose strap only. It is made in various shapes and sizes to suit different parts of the pit and to fit various-sized ponies. AQUEOUS WORKS AND DIAMOND ROCK- BORING 00. LIMITED. This firm (of the Crown Works, Guildford-street, York-road, Lambeth, S.E.) show a rotary prospecting core drill for hand or power drilling with chilled shot or diamonds, with holes of 5 to 2 inches diameter. This machine will bore to a depth of 300 ft.