968

THE COLLIERY GUARDIAN.

May 1, 1914.

APPROVED SAFETY LAMPS.

In the last issue of the Colliery Guardian (p. 897)
particulars were given of the electric safety lamps speci-
fied in the schedule to the Order of March 16. We now
give particulars of the oil safety lamps specified in the
same schedule.

Flame Safety Lamps Approved for General Use.

The Hailwood Lamps No. 012 and No. B 1.

These lamps, the general designs of which are shown
in fig. 11, are modifications of the Hailwood Lamp
No. O 1*; they are double-gauze lamps with air-feed at
the middle ring. The Hailwood Lamp No. 012 burns
oil. and the Hailwood Lamp No. B 1 burns spirit.

Each lamp consists of the following essential parts :—

(1.) Bonnet or Shield, of seamless or riveted steel, with
a separate securely-fastened crown. Burnished with
outlet holes round the top, provided that the bottoms of
the outlet holes are not below the top of the outer gauze.
Furnished also or not with stamped air-admission
indentations as shown in plate 1 in “ The Safety Lamps
Order of the 26th August, 1913,” forming narrow slots
not more than ~in. in depth, so arranged as to prevent
a horizontal current from impinging directly against the
gauze. Fitted or not with q deflector ring, with or
without a baffle ring.

(2.) Middle Ring of brass, steel, or iron riveted to

B.l

HALF SECTION 8 HALF ELEVATION

HALF SECTIONS HALF ELEVATION

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Fig. 11.—Hailwood’s Improved Lamps.
(Ackroyd and Best Limited.)

bonnet, and provided with vertical air-inlet holes of total
area not exceeding 1*5 square inches ; and with or without
additional horizontal air-inlet slots of total area not
exceeding 0‘6 square inch, protected by a baffle ring
formed by the inner flange of the middle ring.

Pillars, of brass, steel or iron, four or more (with or
without an additional sliding pillar), fitted or not with
securely-fastened pillar guards, so arranged that a
straight line touching the exterior parts of adjacent
pillars or guards does not touch the glass. Provided
that lamps now in use fitted with four pillars and not
fulfilling the foregoing requirement may continue to be
used until January 1, 1916.

Bush or Bottom Ring, of brass, steel, or iron.

(3.) Gauzes of not less than 28 S.W.G-. steel or best
charcoal annealed iron wire, 784 meshes to the square
inch, with secure flametight double-folded lap seams, or
single folds secured by iron strips, formed to fit flanges
of the inner and outer base rings, and so secured to the
same by punch indentations as to make strong and
flametight joints.

Internal dimensions.	Outer gauze.	Inner gauze.
Height from shoulder		
of base ring		3f in. ± 1 in.	... 3f5g in. ± 4 in.
(or 3f im ± f in )		(or 3| in. ± | in.)
Diameter at top		If in. ± f in.	... If in. ± f in.
		(or If in. ± | in.
Diameter at bottom	2 in. ± i in.	... 1| in. ± | in.
		(< rlf in. ± fin.)

The arrangement of the gauzes in the lamps is that
shown in fig. 11, and is such that the gauze rings form
the seating necessary to hold the glass firmly in position,
thus preventing the possibility of the lamp being put
together without the gauzes.

There is a provision as to the use of a Mueseler
chimney and horizontal gauze, similar to that in the
former Order, and it is provided also that the lamp may
be fitted with “ The Hailwood combustion tube ”
described in paragraph (1) (&) of the schedule to “ The
Safety Lamps Order of the 9th March, 1914.” (See
Colliery Guardian, April 17, 1914.)

(4.) Glass, of an approved type, cylindrical in form,
and within the dimension limits, and bearing one of the
size marks specified below, and furnished with top and

* See Colliery Guardian, September 12, 1913, p. 523.

bottom asbestos washers to ensure flame-tight joints
with the gauzes and oil vessel.

External diameter......... 564 mm. f + <? mm'

( — 1 mm.

Height.................... 67 mm. ± f mm.

Size mark ................. 56f-67	or A B 1.

Provided that the lamps may also be made to take
glasses of the following dimensions —

External diameter......... 59 mm. f + ? mra’

( — 1 mm.

Height ................... 60 mm. ± f mm.

Size mark................. 59-60 or A B 12.

(5.) Spirit or Oil Vessel.—A casting of brass, or of
stamped steel or brass, of capacity sufficient to provide
the required light for the required time. Fitted in the
case of the Hailwood lamp No. 0 12 with a flat J in.
burner, and in the case of the Hailwood lamp No. Bl
with a round % in. burner: furnished or not with a
porcelain body, and with or without a screw wick
adjuster and electric igniter of the type shown in fig. 11,
each so fitted as not to cause the lamp to be dangerous
in an explosive atmosphere.

(6.) Locking Device, as in previous Order.

(7.) Reflector.— The lamps may be fitted with a
removable reflector.

It is provided that the oil or spirit and the wick used
in each lamp shall be such that the lamp shall be capable
of maintaining 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 (this also applies to the lamps that follow); and
the lamps have been made at the works of Messrs.
Ackroyd and Best Limited, at Morley, near Leeds.

Hailwood Improved Lamps Nos. U.O. 1 and U.B. 4.

These lamps, the general design of which is shown in
fig. 12, are modifications of the Hailwood Lamp No. O.l.
They are double-gauze lamps, with air-feed at the middle
ring and through an air admission ring, protected by
double gauzes situated below the glass. The Hailwood
lamp No. U.O. 1 burns oil, and the Hailwood lamp No.
U.B. 4 burns spirit.

Each consists of the following essential parts :—

(1.) Bonnet or Shield.

(2.) Middle Ring, Pillars, Bush or Bottom Ring, same
as above.

(3.) Air Admission Ring, of the type shown in fig. 12,
forming a flame-tight connection with the oil vessel by
means of an asbestos washer : furnished with air
admission slots protected by securely fastened double
gauzes of the same material, gauge of wire and mesh
as the gauzes described.

Fig. 12.—Hailwood’s Improved Lamps.
(Ackroyd and Best Limited.)

(4.) Gauzes, same as above. The arrangement of the
gauzes in the lamps is that shown in fig. 12, and is such
that the gauze rings and air-admission ring form the
seatings necessary to hold the glass firmly in position,
thus preventing the possibility of the lamp being put
together without the gauzes and air-admission ring.
The lamp may also be fitted with a Mueseler chimney
and horizontal gauze, and be fitted with the “ Hailwood
combustion tube.”

(5.) Glass, of an approved type, cylindrical in form,
and within the dimension limits and bearing one of the
size marks specified, and furnished with top and bottom
asbestos washers to ensure flametight joints with the
gauzes and air-admission ring.

External diameter .......... 56|	mm.

Height..................... 67 mm. ± | mm.

Size mark ................. 56|-67 or A.B 1.

(6.) Oil or Spirit Vessel, of brass, or stamped steel or
iron with a securely fastened brass top, of capacity
sufficient to provide the required light for the required
time as specified in paragraph (9) below : fitted with a
flat f to f-inch burner and provided or not with a
porcelain body, and with or without a thumb-screw wick
adjuster and electric igniter of the type shown in fig. 12,
each so fitted as not to cause the lamp to be dangerous
in an explosive atmosphere. The screw threads of the oil
vessel are slotted to take the bolt of the magnetic or
pneumatic lock as shown in fig. 12. Air admission slots
of total area not exceeding 0’6 square inch are provided
round the periphery of the oil vessel as shown in
fig. 12.

(7.) Locking Device.—As in former Order.

(8.) Reflector.—The lamps may be fitted with a
removable reflector.

The lamps are made at the works of Messrs. Ackroyd
and Best Limited, at Morley, near Leeds.

Best's Excelsior Lamp No. 2.

Best’s Excelsior Lamp No. 2, the general design of
which is shown in fig. 13, is a modification of Best’s
Excelsior Lamp No. 1,* and is similar to it in all but
the following respects :—

(1.) The Bonnet is of the ‘‘ screw-off ” type. It is
screwed to the middle ring and locked by means of a
spring pawl, which engages with a ratchet ring. The
ratchet ring is secured to the middle ring, but means
are provided to permit of a vertical movement of about
in. The arrangement is such that unless the gauzes
are in place, the ratchet ring is not raised into the
position to enable the spring pawl to engage the teeth
and lock the bonnet.

The lamp is made at the works of Messrs. Best’s
Safety Lamps Limited, at Providence Works, Park-
lane Mills, Leeds.

Fig. 13.—Best’s
“Excelsior” Lamp
No. 2.

Fig. 14.—J.C.B. Lamp
No. 19 F.

(Joseph Cooke and Sons.)

(Best’s Safety Lamps Ltd.)

The J. C. B. Lamp No 19 F.

The J.C.B. Lamp No. 19 F is a modification of the
J.C.B. Lamp No. 19,* and is similar to it in all but the
following respects:—

(1.) The Middle Ring is riveted to the bonnet, but is
not furnished with lugs for the purpose. It is furnished
with vertical air-inlet slots of total area not exceeding
1‘2 square inches, but is not provided with horizontal
slots for admitting air.

(2.) Gauzes of not less than 28 S.W.G-. steel wire, 784
meshes to the square inch, with secure flametight lap
seams strengthened or not with metal strips, each
gauze formed to fit flanges of the inner and outer base
rings, and so secured to the same by rivets or by being
spun on as to make strong and flametight joints. When
the lamp is used with a 60. mm. glass the inner gauze is
provided with a solid metal collar 7 mm. in thickness,
which forms a flametight connection between the two
gauze rings. The arrangement of the gauzes in the
lamp is one of the arrangements shown in fig. 14. 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 a gauze.

(3.) Glass of an approved type, cylindrical in form,
an d/within the dimension limits, and bearing the size
mark specified below: furnished with top and bottom
asbestos washers to ensure flametight joints with the
gauzes and retaining ring, and fitted or not with
additional loose brass end rings:—

External diameter.......... 57f	mm. f + ? mm-

(. — 1 mm.

Height.................... 60 mm. ± f mm.

Size mark ................ 57|-60

Provided that the lamp may also be made to take a
glass of the following dimensions :—

„ ,	. ,.	.	( + 0 mm.

External diameter......... 57 mm.	_

Height ................... 67 mm.	±	f mm.

Size mark................. 57-67

The lamp is made at the works of Messrs. Joseph
Cooke and Sons, at 203, Lawley-street, Birmingham.

The Cremer Marsaut Lamp No. 15.

The Cremer Marsaut Lamp No. 15, the general design
of which is shown in fig. 15, is a double-gauze, flame, oil
lamp, with air-feed through vertical slots in the middle
ring. It consists of the following essential parts :—

(1.) Bonnet or Shield, of riveted steel, with a separate

* See Colliery Guardian, September 12, 1913, p. 524.