August 7, 1914. THE COLLIERY GUARDIAN. 311 APPROVED SAFETY LAMPS FOR MINES. New Order. Fig. 1.—Showing arrange ment of gauzes (John Davis and Son.) In pursuance of section 33 of the Coal Mines Act, 1911, the Home Secretary has made an Order, dated July 1, 1914, amending the Schedules to the Safety Lamps Orders of August 26, 1913, and March 16, 1914. Flame Safety Lamps Approved for General Use. The Davis-Marstif Lamp. The Davis-Marstif lamp is a modification of the No. 1 lamp made by Messrs. John Davis and Son (Derby) Limited, and the description of the lamp is the same as that of the No. 1 lamp,* * * * § with the following variations :— (1.) Pillars.—The lamp may have four pillars instead of five, subject to the condition that the pillars are so arranged that a straight line touching the exterior part of con- secutive pillars does not touch the glass. (2.) Gauzes.—The gauzes may be secured to the inner and outer base rings by means of rivets. The arrangement of the gauzes in the lamp is that shown in the following drawing, and is such that the gauze rings form the seating necessary to hold the glass firmly in position when the retaining ring is screwed home, thus preventing the possibility of the lamp being put together without both gauzes. The Mar said K. V The Mueseler K. I T The Marsaut K.B. ( Lam?s- The Mueseler K.B.) These lamps, the general designs of which are shown in fig. 2, are modifications of the Marsaut “A” lamp, and the description of the lamps is the same as that of the Marsaut “A” lamp,} with the following varia- tions :— (1.) Crown or Bonnet.—The Marsaut K.B. and Mueseler K.B. lamps are each provided with a brass crown supported by three or more iron or steel pillars. A riveted steel bonnet is firmly secured to the crown and middle ring, as shown in fig. 2. In the case of all the lamps, the crown may be pierced with ventila- tion holes not exceeding in. in diameter. (2.) Pillars.—The lamps may have four pillars instead of five, subject to the condition that the pillars are so arranged that a straight line touching the exterior part of consecutive pillars does not touch the glass. (3.) Gauzes.—The arrangement of the gauzes in the lamps is one or other of the arrangements shown in the Safety Lamps Order of August 26, 1913,} and fig. 2 in ARRANGEMENT FOR FOU R Pl LLARS IN MARSAUT “K" LAM P Fig. 2.—Mueseler K. and Marsaut K.B. Lamps. (J. H. Naylor.) this Order, and is such that the gauze rings form the seating necessary to hold the glass firmly in position when the oil vessel is screwed home, thus preventing the possibility of the lamps being put together without gauzes. Internal dimensions. Height from shoulder of base ring ....... Diameter at top ...... Diameter at bottom ... Outer gauze. 4 in. Jh } in. If in. ± > in. If in. ± f in. Inner gauze. . 3| in. ± } in .. 1 9 in. ± j in . If in. ± I in. In the case of the Mueseler K. and K.B. lamps, a Mueseler chimney and horizontal gauze with hoops as shown in fig. 2, take the place of the inner gauze. Pro- vided that the horizontal gauze forms a flametight connection with the Mueseler chimney, and that the dimensions of the latter are as follows :— Inches. Length below horizontal gauze not less than... f Length above horizontal gauze not less than... 3} Diameter at top not greater than ........... £ Diameter at bottom not greater than........ 1} * See Colliery Guardian, September 12, 1913, p. 525. } See Colliery Guardian, September 26, 1913, p. 643. (4.) Oil Vessel.—The oil vessel is recessed on the top to take the glass and the asbestos washer, thus ensuring the formation of a flametight joint. The lamps are made by J. H. Naylor, Esq., of Wigan. The Cambrian Lamp No. 9. The Cambrian Lamp No. 9 is a modification of the Cambrian Lamp No. 3, and the description of the lamp is the same as that of the Cambrian Lamp No. 3,* with the following variations :— (1.) The Outer Gauze is secured to and forms a flame- tight joint with a screw ring, as shown in fig. 3. This P CAMB [ LAMPN? BOTTOM VIEW OF SHIELD RING PLAN OF STEP Rl N G. Fig. 3.- Cambrian Lamp No. 9. (Thomas and Williams.) ring is screw-threaded internally to take the screw-thread on the inner flange of the middle ring, and externally to take the screw-thread on the bonnet ring. It is thus impossible to attach the bonnet to the lamp unless the outer gauze is in position. The bonnet is locked to the lamp by means of a sliding pillar controlled by a spring and held in position by the oil vessel. (2.) Middle Ring.—The middle ring is not provided with horizontal air inlet slots, but with vertical inlet slots of total area not exceeding 1’75 sq. in. The lamp is made at the works of Messrs. E. Thomas and Williams Limited, at Aberdare. Flame Safety Lamps Approved for Special Purposes. (a) For Use by Officials Only. The Marsaut K. 1 The Mueseler K. 1 The Marsaut K.B. 1 ( The Mueseler K.B. If ] These lamps are modifications of the Marsaut K, Mueseler K, Marsaut K.B., and Mueseler K.B. lamps respectively, and the descriptions of the lamps is the same as the descriptions of those lamps,} with the following variations :— (1.) The Crown, Bonnet, Middle Ring, Bottom Ring, and Oil Vessel may be of aluminium. (2.) The Gauzes may be of copper in the case of lamps used for surveying purposes. (b) Roadway Lamp. The No. 7 Deflector Roadway Lamp. The No. 7 Deflector Roadway lamp, the general design of which is shown in fig. 4, is a double gauze, flame, oil lamp, with air-feed through vertical holes in the middle ring. It consists of the following essential parts :— (1.) Crown of brass, supported by three or more steel or iron pillars. (2.) Bonnet or Shield of riveted steel, finished 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 outer gauze. (3.) Middle or Pillar Ring of brass, fitted with a deflector ring as shown in fig. 4, provided with vertical inlet holes of total area not exceeding 2-6 sq. in. Lower Pillars, of brass, steel, or iron, five, so arranged that a straight line touching the exterior part of conse- cutive pillars does not touch the glass. Bottom or Lock Ring of brass. (4.) Gauzes of not less than 28 S.W.G. steel wire, 784 meshes to the sq. in., 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 or rivets, or with a ring securely spun on to the gauze flange as to make strong and flametight joints. The arrange- ment of the gauzes in the lamp is that shown in fig. 4, and is such that the inner gauze can pass up the centre of the middle ring, whilst the outer gauze ring forms the * See Colliery Guardian, October 24, 1913, p. 853. } See Colliery Guardian, September 26, 1913, p. 643. seating necessary to hold the glass firmly in position when the retaining ring is screwed home, thus prevent- ing the possibility of the lamp being put together with- out the gauzes. Internal dimensions. Outer gauze. Inner gauze. Height from shoulder of the base ring ......... 5| in. + } in. ... 5} in. ± } in. Diameter at top........ 3 in. ± |in. ... 2|in. ± jm. Diameter at bottom .... 3 in. ± jin. ... 3 in: ± |ir. (5.) Glass of an approved type, cylindrical in form, and within the dimension limits and bearing one of the SECTION OF AUTOMATIC LOCK ON SHI ELD. Fig. 4.—No. 7 Deflector Roadway Lamp. (R. Johnson, Clapham, and Morris.) size marks specified below. Furnished with top and bottom asbestos washers to ensure flametight joints with the gauzes and retaining ring. External diameter .... 89 mm. f + ? mm’ ( — 1 mm. Height................ 101 mm. mm. Size mark ............ 89-101 or J.C.M. 8. (6.) Glass retaining Ring of brass furnished with a screw thread to take the bottom ring. (7.) Oil Vessel.—A casting of brass of capacity suffi- cient to provide the required light for the required time; fitted with two flat f in. burners. Fig. 5.—Locking Arrangement, Varta Electric Lamp. (8.) Locking Device.—N lead- rivet lock with a hinge or lug securely fastened to the bottom ring by a sliding band or other- wise, and a staple or lug securely soldered to the oil vessel. (9.) Reflector. — The lamp may be fitted with a removable reflector. The lamp is made at the works of Messrs. Richard John- son, Clapham and Morris Limited, at Newton Heath, Manchester. Other Amendments. 1. In the description of the Varta Miners’ Electric Safety Lamp*— (a) Paragraph (2) shall be amended to read as follows— “ A stamped steel top which is secured to the cylindrical case by a ‘ bayonet ’ flametight joint, and locked by a magnetic lock of either of the types shown in the previous Order or in fig. 5, so constructed that the bolt can be withdrawn only by applying the pole of an electro- magnet to the face of the lock. ’ ’ (5) Paragraph (5) shall be amended to read as follows— “ A sheet-steel crown supported by four or more steel pillars riveted at both ends.” 2. The description of the “ Oldham ” Shaft and Roadway lamps} shall be read as if the reference to type “ C ” were omitted. 3. In the description of the “ Cremer Marsaut Lamp No. 15 ”+ the title of the lamp shall be ” The Cremer Marsaut Lamp No. 12.” 4. In the description § of Patterson and Company’s * See Colliery Guardian, April 24, 1914, p. 898. } See Colliery Guardian, October 31, 1913, p. 906. | See Colliery Guardian, May 1, 1914, p. 968. § See Colliery Guardian, May 1, 1914, p. 968.