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The mahogany case is on three levelling screws. The front sliding window
is on sash cords; the side windows are hinged. Two drawers, left
drawer empty; right contains brass boss and two convex mirrors (intrusions);
also an A. van Emden advertising leaflet, after 1877. The circular
bubble level is in a brass housing in front of the pillar; silvered levelling
scale plate graduated 25 - 0 - 25 by ones. The scale pans are in
brass frames with iron hooks above and below the upper, curved, crossbars.
The balance beam is of nickel-plated brass; at each end is an iron
bracket integral with knife edge, held by two screws with small adjusting
screw at side. The knife edge engages in a steel semi-cylinder with a
narrow flat on the inside, and an iron hook to the pan frame. The semicylinders
are held in the rest position by brass brackets fixed in the top
of the case.
At the base of the back of the case is a rod with, at right-angles,
two camel-hair brushes set into quills, turned by an external knob, for
steadying the pans.
Centrally at the front, a key lifts the whole beam support
through the pillar. The beam has an iron knife edge resting on an iron
flat dove-tailed into supports. A knurled knob at the top of the pillar is
for sensitivity adjustment. Balance pointer is iron, blued on front side.
A physical and chemical laboratory at Teyler’s Museum was
opened in 1884, and in charge was an amanuensis, the instrument
maker J.A. Schoonbeek, who served until 1899. Turner (1985), 238.
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371
371 GASMETER (13) 1874
Signed; Julius Pintsch Dresden Berlin Breslau
Overall height 350; diameter of paddle chamber 280
Made of brass and iron, painted black. The paddle wheel with glass
vanes is under the curved glass cover at the back. It turns a worm in the
red-painted front chamber, with register on three dials above, with a
protective door. Dials read in cubic metres:
OBS 1
100 meter
OBS 1
10 meter
OBS 1
1 meter
Brass-topped inlet to the side of the register chamber, and outlet above
vane chamber. Four levelling screws at base. Circular, embossed plaque
on top of instrument reads: Julius Pintsch Dresden Berlin Breslau Gas
Messer fur 3 Flamen Nr 51547.
372 ELECTRIC METERS (1004,1005) 1/4 20th C.
1004 Inscribed on black copper plaque: Elekrizitätszähler
No. 205374 SYSTEM ARON
2 x 5 Amp. 2 x 220 Volt fur GLEICHSTROM
Base 350 x 210; overall height 496
1005 Inscribed on black copper plaque: Elekrizitatszahler
No. 196273 SYSTEM ARON
5 Amp. 220 Volt fur GLEICHSTROM
Base 199 x 180; overall height 408
Oak-cased meters with wall bracket at back; underneath, holes for
cables with porcelain grommets, -some missing. Lower glass window
shows plumb-bob; dials are Kw hours: 1000's, ;l;'00's, 10's, units and
tenths (1004 has two groups of dials). The left-hand compartment of
1004 has clockwork for tariff adjustment by time of day.
373 TOWN GAS PHOTOMETRY (923) c. 1906
Signatures of: WILLIAM SUGG & C° LD Engineers WESTMINSTER;
ALEXANDER WRIGHT & C° ENGINEERS
WESTMINSTER S.W.; GEORGE W ILSOlgS GRAVEN-
HAGE
An extensive set o f equipment for testing the luminous quality o f town gas,
which is paid for by the therm. This is a unit o f energy used mainly for the
sale o f gas. The various items are here listed with and in the order o f the
original part numbers. Some are now lost, for example the track. With the
introduction o f gas lighting in The Netherlands during the first decade o f
the twentieth century, equipment was imported from Britain and Germany,
and two items, the control and regulator, are marked with the name o f
George Wilson, ^ Gravenhage. This was the N. V. Nederlandsche
Gasmeterfabriek G. Wilson o f The Hague. See M o o if (1988), 107-108.
For Schott glass, makers o f the Methven screen, see Die Entstehung des
Glaswerks von Schott & Gen. (Jena, 1928). Acquiredfrom the Stedelijke
Gasfabriek, Leiden, after 1909.
1 Document of 1906 10 Photometer
3 Argand burner 11 Communicator
4 Balance 12 Governor
5 Screen Up Slide rule
Deal box 14 Jointed rule
7&8 Burner 15 Pentane lamp M Meter
1. Document. Metropolis Gas. Notification o f the Gas Referees for the Year
1907. (London: H.M.S.O., 1906). A 51-page foolscap document with
instructions and diagrams for setting up the equipment. The Gas
Referees were C.V. Boys, J.S. Haldane, A. Vernon Harcourt, all well-
known scientists.
3. Argand burner. Screens (105 x 85) in blue glass each side. Blackened
metal frame and rod underneath to fit into socket. Burner with black
reflector behind. Overall height 250.