June 19, 1914.

THE COLLIERY GUARDIAN.

? 1389

be cumbersome to swing about on the roadway of a pit.
It is deliberately made long for this purpose.

The John Hailwood tub greaser shown in fig. 3 is in
its last form provided with a hinged lid. The spring
upon which the greasing wheel rests is also shown. A
feature of the appliance is the ease with which the grease
bath can be cleared of obstructions.

Several interesting instruments are on view. One of
these is the Ackroyd-Best and Davis anemometer, in
various sizes. The main feature of this anemometer is
that whilst being particularly accurate it is made to
overcome the trouble common to other types of instru-
ments using a twisted metal arm for supporting the vane,
and which has a tendency to untwist and consequently
upset the reading of the instrument, by rigidly attaching
the vane to a rod which is held in a split boss, this split
boss being tightened up after the vanes have been
adjusted to the correct angle. All internal strain is,
therefore, avoided, and the instrument remains true for
a considerably longer time than that of other types of
instruments.

A handy portable form of hygrometer is shown, which
may be closed up for carrying purposes, its form in that
position shielding it from injury. The thermometers are
also mounted on springs to lessen danger of breakage.
Another interesting instrument is a psychometer (fig. 4),
this really being another form of hygrometer, the main
thing being that it is somewhat cheaper, and has the
advantage that by seizing the projecting handle, which
is loosely fitted to a spindle attached to the framework,
the main body of the instrument may be rotated some-
what after the manner of the old watchman’s racket or

Fig. 3.—Hailwood Tub Axle Greaser.

Fig. 4.—PortableSPsychometbr.

(Ackroyd and Best Limited.)

rattle; the large number of revolutions bringing the ther-
mometer better into contact with the air and giving a
quick reading.

Other exhibits on this stall include various lamp-room
accessories, a sample of the Hailwood hot air furnace
bridge for smoke consuming purposes in boilers, the
Hailwood air-grooved chilled furnace bars, and
Hailwood’s non-contracting furnace cement suitable for
coke ovens.

Messrs. Ackroyd and Best are agents for the Griffin
Mill manufactured by the Bradley Pulverising Com-
pany, and exhibit a working model which will well
repay inspection. The model demonstrates the highly
efficient system of grinding claimed for this mill,
which has already been described in the Colliery
Guardian (December 19, 1913, p. 1273). It will
produce from colliery shale one ton per hour of
“ buoyant ” dust of a floury texture, leaving no residue
on 100 by 100, and only 10 per cent, on 180 by 180.
The fifth report of the Explosions in Mines Committee
emphasises in several places the necessity that stone
dust should be sufficiently buoyant to mix readily on
equal terms with the fine coal dust floating in the
atmosphere, and demonstrated that coarse dust which
was not of this buoyancy has little effect on cheeking
inflammation. This system of grinding has the
peculiar effect of considerably reducing the density of
the material treated. For instance, the density of the

shale from which the fuller’s earth is prepared is 2'98,
whereas the density of the fuller’s earth produced is
only 1-6, or very little more than that of coal dust, so
enabling it to mix on equal terms in the atmosphere.
The same effect to a considerable extent is obtained
with colliery shale. It is claimed that no other system
of grinding can produce this result, and although some
eminent engineers advocate the presence of some coarse
dust, everyone admits the absolute efficiency of fine
stone dust as an active agent in checking inflammation.

ED. BENNIS & CO. LTD.

Two exhibits are shown. One of these is the Bennis
self-cleaning compressed air furnace, arranged for hand
firing. This furnace burns any class of fuel, large or
small, and it burns with special advantage poor quality
and refuse fuels, such as pond settlings, coal pickings,
lumps and small, coke dust, shale or material which
contains a large percentage of ash or clinker. The
furnace consists of a strong cast-iron front, lined with
fire brick, and fitted with a door of ample size for hand
firing. The fire bars are of the Bennis self-cleaning
trough type; each trough is provided with an independent
superheated steam jet blower, and fitted with grids
having graduated air spaces. A steel shaft, carrying a
cam for each bar, is placed immediately beneath the

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° £ N N I S t'TTU WUOW

Messrs. Bennis’s Exhibit.



front to operate the bars, compelling them to stir up the
fire and convey it slowly to the back of the gate where
the clinker is deposited in a pit arranged for its reception.
This furnace is particularly useful in collieries, and
specially adapted to their requirements. During the
process of cleaning out the ashes there is no fall in the
steam pressure as there is with ordinary hand firing.

In the Bennis patent new link chain-grate stoker, the
links are halved together and rounded at their ends,
and the drive is adapted to give six variations of speed,
to suit various classes of coal and varying loads. The
grate can also be used with forced draught. The pro-
vision of the patent air seals (which prevent the entry
of an excess of air at the sides), the machine-cut 6-speed
gear running in oil, and ball-thrust bearings, are among
the improvements.

J. HOPKINSON & CO. LTD.

This exhibit comprises full size models of the two-
flued and water-tube boiler fronts, equipped with
Hopkinson’s patent safety boiler mountings, and arches
£>uilt up of Hopkinson’s valves for all purposes, includ-
ing high pressure stop valves, automatic exhaust valves,
wedge sluice valves, steam traps, etc. The exhibit is
generally very similar to those which the firm has
exhibited for the last five years, and comprise
specialities which are well known to our readers.

W. T. NICHOLSON & CLIPPER CO. LTD.

In addition to the original “ Clipper ” belt lacing tools
and hooks, several new forms of belt fasteners are shown.
There are also the “ Klincha " belt lacing tools and
fasteners, which provide a quick means of making the
joint, the hooks being connected together by means of
a serrated metal strip. Instead of the wire hooks, of
which it is composed, being in separate parts as before,
they are now all fastened together, so that the joint of a
3 in. belt can be made with one blow of the mallet. We
are informed that at a test recently made at the Muni-
cipal School of Technology, Manchester, a 3 in. leather
belt joined with the fastener was subjected to a strain
of 2,100 lbs., which broke the belt but left the fastener
intact. This belt may be inspected on the stand. The
“ Baby Klincha ” is specially adapted for small users of
belting, and this is also shown on the stand. Another
type of fastener made by the firm is the “ Drednort. ”
In it plates are used instead of wire hooks, but the same
provision is made by means of loops for the insertion of
the pin to complete the coupling. It practically forms
a hinged butt joint, and is particularly adapted for use
in joining up “ Balata ” and other fabric belts. It is
equally flexible with the “ Klincha ” fasteners.

Another speciality of the firm is the “ Indestructible ”



file and tool handle. This handle has a thin flanged steel
tube pressed into the centre. The object is to allow the
tube to take up all the splitting action of the file when
driving in, and it also prevents the ferrule from falling
off : consequently, there is no danger of the file tang
running into the operators’ hands.

The “ Klincha ” electrical specialities are also shown.
These include a patent locking lamp holder and a patent
shade carrier ring.

A. BOLTON & CO.

Several of Bolton’s patent steam superheaters are
shown for all classes of steam boilers. All types embody
the special features—“ Field ” tubes, double circulation,
and high efficiency. No. 1 type is the standard type, and
Nos. 2 and 3 are sectional types, which make provision
for the rapid removal and renewal of tubes without using
studs or set screws.

J. SHAW & GREENHALGH LTD.

This stand comprises the front of a large boiler
arranged to display some of the firm’s high pressure
boiler mountings. These comprise a high steam and low
water safety valve, deadweight safety valve of the
enclosed type, junction stop valve, fed valves, parallel
slide blow-off valve, high pressure isolating valve, pro-
tected water gauges, steam pressure gauges, etc,