Ci.ass V.]
PNEUMATIC MACHINES, Ac.—AWARDS.
175
shire. Specimeus of iron, viz., square, round, flat, half-round, oval bar-iron. Angle , T, and girder iron. Tire ironfor wheels. Engine, floor, and foot-plate iron. For whichcollection of exhibits a Prize Medal is awarded. (CouncilMedal awarded by Class XXII.)
No. 649, p. 247. Mersey Irox Company, Liverpool.
Samples of patent rolled iron, principally for ship-building,whereby a saving of workmanship in knees for ships iseffected. A Prize Modal awarded.
No. 202, p. 22(1. Asiiby, Jonathan, Croydon Common,Surrey. A screw friction clutch. Commended as a goodinvention, of which Honourable Mention is made.
SECTION (C).
Sub-
division.
ARTICLED
England and the !Colonies. i
Medals.
Medals. |
MedaK i
Medals.
2
15
J
Council.
Prize.
i
Exhibits.
Council.
Prize.
Council.
,
l
o ;
'3
-)
Council.
Prize.
•1 f
1. Air pumps - —
_
_
_ ; ■ _
_
_
_
_
_
2. Blowing fans - -
3
—
1
- —
-
-
—
-
2
_ j
§ i
3. Blast engine - -
1
—
_
- -
—
—
_
_
_
_ _
1 1
4. Miscellaneous - -
-
-
-
-
-
-
-
-
-
-
Total- — -
4
-
I
- 1 -
-
-
-
-
o
- i 1
Sub-
division.
ARTICLES.
Denmark
France. ;
Exhibits.
Medals.
"p.
Medals.
Exhibits.
Medals.
Exhibits.
Medals.
| Medals.
5
O
Prize.
Council.
Prize.
"y
c v
3 1
s - & ■
Council.
Ih’ize.
Exhibits.
Council.
Prize.
1 1 2. Blowing fans - -s j 3. Blast engines — -
1 Total — - -
-
-
-
-
-
-
3
1
-
-
-
-
- -
-
-
1
-
-
-
3
- : i
-
-
-
i
Awards in Section C.
No. 300, p. 226. Lloyd, G., 70 Great Guildford Street,Southwark, Inventor aud Manufacturer of the patentcentrifugal disc blowing machine, is awarded a PrizeMedal.
The vanes of the blower are curved, and the sidesconical. The air enters into a space left for its admissionabout the axis, and is expelled when the vanes are putrapidly in motion at its periphery, into a case whichsurrounds it, from which it is conducted by a pipe, andthe blast applied by a nozzle. The exhauster differs fromthe blower in not having an outside case. The air isconducted by a pipe from the space to be exhausted tothe central part of the exhauster, and expelled at itsperiphery. The improvement claimed is in the curvingof the vanes and in the conical form of the sides. Theaction is stated to be noiseless, and the power consumed,less than that in the ordinary blower.
The Jury, being desirous of verifying these statements,directed a series of experiments to be made, of which theresults are detailed in the following table (see p. 176). Theblower being driven by Messrs. Clayton and Shuttlevorth’ssteam engine, through a band which was passed overthe drum of M. Morin’s dynanometer, the work expendedin driving it was registered by that instrument, withwhatever velocity it was driven. The number of revo-lutions made per minute was measured by a counter, andthe blast being received into a closed reservoir, was allowedto escape from it by a rectangular pipe, whose aperturecould be varied by a slide. The pressure of the air inthe reservoir was measured outside, by means of a bentglass tube communicating with the interior, and contain-ing water.
The pressure of the air in the reservoir being known,and the dimensions of the aperture by which it escaped,
the velocity and density of the blast could be calculated.*Hence its vis viva was known, half of which representsthe work which the blast was capable of doing if all itspower could have been applied. The apparatus wasconstructed under the direction of Mr. Hensman, and theexperiments were made and the table calculated by Mr.Hatcher (see page 176).
The blower of Mr. Lloyd was found to work compara-tively without noise. It is due to him to state that theapparatus at the command of the Jury did uot enablethem to drive the fan with that velocity which he alienedto be necessary for obtaining the greatest useful effect?
No. 120, p. 1155 (Belgium ). The Marcinellf. andCouillet Smelting Company. A ventilator for ainimmines. A. Fabry, inventor. This machine consists oftwo wheels, having parallel axes, each carrying three vanesof a peculiar form, and made to revolve in opposite direc-tions. These vanes engage and disengage with one anotherlike toothed wheels; and as they separate, create, by theirpeculiar epieyclical forms, a vacuum about the axes ofthe wheels, discharging the air into a surrounding case,by their peripheries. The wheels do not drive one anotherby the contact of their vanes, but by an independent me-chanical connexion of their axes.
An economy of power is claimed in the use of thismachine, as compared with the ordinary means of ven-tilation in mines. It has been introduced within the lastfew years in various mines in Belgium , particularly inthose near Charleroi . The Jury have awarded a PrizeMedal to the exhibitor.