March 14, 1913. THE COLLIERY GUARDIAN. 543 APPROVED SAFETY LAMPS. Home Office Order. An Order [No. 69] has been issued by the Home Secretary, dated January 14, 1913, under section 33 of the Coal Mines Act, 1911 (1 & 2 Geo. 5, c. 50), approving certain types of safety lamps for use in mines to which the Act applies. The Order approves “ until further order, for use in all mines to which the Act applies the types of safety lamp and safety-lamp glass described in the schedule to this Order and subject to the conditions specified in the schedule.” The schedule is as follows :— (a) Approved Lamps.—1. Hailwood Lamp No. 1. The Hailwood lamp No. 1, the general design of which is shown here, is a single gauze,* flame, oil lamp with air feed through vertical holes in the middle ring. It consists of the following essential parts :— (1.) Bonnet or Shield of seamless steel with a separate securely fastened crown or cap. Height from bottom of middle ring to top of crown ................ 5 in. ± f in. Internal diameter at top.......... 2|in. ± | in. Internal diameter at bottom....... 2f in. ± £ in. Furnished with outlet holes immediately below the crown; provided that the bottom of the holes shall not be less than in. above the top of the gauze. Fitted or not with a deflector (with or without a baffle ring). (2.) Middle Ring of brass, steel or iron rivetted to bonnet and provided with five vertical air inlet holes of total area not greater than IT square inches. The inner flange prolonged or not to form a baffle ring. Pillars of brass, steel or iron, five, so arranged that a straight line touching the exterior part of consecutive pillars does not touch the glass. ’ Bush or Bottom Ring of brass, steel or iron. (3.) Gauze of not less than 28 S.W.G. steel wire, Elevation, Half In N? fl £ J J Ml iai Section through Magnetic Lock Flan, ection at X.X. Hailwood Lamp (No. 1). Made by Messrs. Ackroyd and Best Limited. 784 meshes to the square inch, with double-folded lap seams, formed to fit flanges of the inner and outer base rings, and so secured to the same by punch indentations as to make a strong and flame-tight joint. Internal Dimensions.— Height from the shoulder of the base ring ................... 3T% in. ± | in. Diameter at top ................ 1| in. ± in. Diameter at bottom ............. If in. ± ^in. Provided that the gauze may be fitted or not with a gauze cap or a Mueseler tube. (4.) Glass.—Cylindrical. Height................67 m.m. ± | m.m. External diameter ... 56| m.m. ± 1 m.m. I Furnished with top and bottom asbestos washers to ensure flame-tight joints with the gauze and retaining ring. j (5.) Glass Retaining Ring of brass provided with a left- handed screw thread; provided also with ratchet teeth to engage the bolt of the magnetic lock. | (6 ) Oil Vessel.— A casting of brass of capacity sufficient to provide the required light for the required time as specified in paragraph 9 below; fitted with a flat i-inch burner and provided or not with a porcelain body and with an electric spark igniter of the type 'shown in the drawing so fitted as not to cause the lamp to be dangerous ' in an explosive atmosphere. | (7.) Locking Device.—A vertical iron bolt and plug kept j in position by a spiral spring, and so arranged that the bolt can only be withdrawn by applying the pole of an electro- magnet through the hole in the base of the oil vessel. (8.) Reflector.—The lamp may be fitted with a reflector. (9.) Provided— (i.) That the strength of material and attachments ’ throughout the lamp is not less than in the ! sample submitted to the mechanical tests on the 1 24th and 25th October, 1912. (ii.) That the oil and wick used in the lamp shall be such that the lamp shall be capable of main- taining a light of candle-power not less than 0*30 as determined by a pentane standard all' round in a horizontal plane throughout a period of not less than 10 hours. (iii.) That the lamp has been made at the works of Messrs. Ackroyd and Best Limited, at Morley, near Leeds. (iv.) That the glass shall be of an approved type, and that its dimensions shall not be outside the \ ;;; Side Elevation - Half in Section. limits laid down in paragraph 4. (v.) That the lamp shall have marked upon it its name and the name of the maker. 2. The Oldham “ Emergency ” Electric]Lamp. The Oldham “Emergency ” Electric Lamp, the general design of which is shown herewith, is of the bulVs-eye type. It possesses the following essential features :— (1.) A cast aluminium case, with a cover secured by a lead rivet lock. (2.) An electrical accumulator, so constructed as to * This specification, so far as regards the use of a single gauze, is provisional, and will remain in force only until January 1914, or for lamps now in use, until January 1, 1916. Front Elevation shewing Switch Contacts and Lamp 3 .3 / / / i / The Oldham “Emergency” Electric Lamp. prevent the escape of the liquid, whatever the position of the lamp, whilst allowing the escape of gas generated by chemical action in the accumulator. (3.) A flame-tight screwed plug of vulcanite, or other suitable material, enclosing the contact made between the insulated lead and the positive terminal of the cell. (4) A switch contained in a flame-tight enclosure, the cover of which, with its washer, is secured by screws. The screw heads are pierced so that a wire may be threaded through, and the ends sealed with lead seals. (5.) A bulb and reflector contained in a second enclosure, which communicates with the switch enclosure. It is made i flame-tight by means of a screwed ring containing the lens and a washer. The ring is prevented from unscrewing by means of a clip secured by screws, the heads of which are pierced as in the case of the switch cover screws. The lens may be of either of the types shown in the drawing or of other types if not inferior in strength. Provided— (1.) That the total weight of the lamp is not more than 41b. 8oz. (2) That the strength of material and attachments throughout the lamp is not less than in the sample submitted to test on the 30th October, 1912. (3.) That the lamp is capable of maintaining a light of