Improvements in Chambers for the Manufacture of White Lead.
Year: 1898

page_text: Date of Application, 1st June, 1898-Accepted, 6th Aug., 1898
COMPLETE SPECIFICATION.
Improvements in Chambers for the Manufacture of White Lead.
We, SAXBY'S WHITE LEAD SYNDICATE, LIMITED, of Hythe Wharf, Cumberland
Park, Willesden, in the County of Middlesex, and HENRY GEORGE PERCIVAL, of
Hythe House, Willesden, in the County of Middlesex, White Lead Manufacturer,
do hereby declare the nature of this invention and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement:
-
This invention relates to the construction and arrangement of chambers for the
manufacture of white lead in such a manner that the process can be managed
externally, without exposing workmen to the deleterious atmosphere within. The
particular process for which chambers according to this invention are intended is
that of subjecting metallic lead to the action of acetic acid vapour, air moisture
and carbonic anhydride in suitable orders and quantities at suitable temperatures,
but as this process is well known, no claim is intended to be made in respect of
it, but only to the construction and arrangement of the chambers in which it is
carried on, which will be described with reference to the accompanying drawings
in the several figures of which corresponding parts are denoted by like letters of
reference.
Figures 1, 2 and 3 are sections on the lines 1-1, 2-2, and 3-3 respectively of
Figures and 5.
Figure 4 is a plan of the floor partly broken away to shew the air spaces and
heating pipes below it.
Figure 5 is a plan at a lower level shewing the air and gas conduits.
Under the floor are formed channels which are supplied with air by a pipe
and with carbonic anhydride by a pipe f having two branches f¹ opening near the
walls of the channel which act as deflectors causing the gas to mingle with the
air. The pipe is supplied from an external shaft e provided with a valve or
damper At the same low level there are other air pipes e which are supplied
from external shafts and which bend upwards and open into an air chamber
immediately under the floor. This chamber has in it rows of dwarf piers pspanned
by slabs which carry the floor consisting of slabs bedded on cement. Between
the rows of piers are steam pipes a for heating the floor and the air supplied by the
pipes e. The air chamber containing the steam pipes communicates with spaces k
in the side and end walls which are thus heated. Across the space k there are
fixed several short pipes which have openings to the exterior and interior of the
chamber and also lateral openings to the spaces in the walls. As any of these
openings can be plugged from outside, either cold or hot air, or no air, can be
admitted by them to the chamber. The floor of the chamber is preferably made
to slope a little from the sides and ends towards the middle, and through this floor
pass pipes which ascend from the channels g below and extend some distance
above the floor. Air pipes / lead from the ceiling of the chamber to a space in the
roof whence the air and gases pass to a chimney n. Vapours are condensed in the
exposed pipes, and the liquid collects in o whence it returns to the chamber by a
Di Q71

page_text: pipe o¹. Each of the air pipes 7 is provided with a throttle valve in any con-
veniently accessible position. Windows allow inspection of the interior, and
doors m serve to give access to the chamber, these doors being tightly closed while
the process goes on.
The interior of the chamber is fitted with framing and
shelves made of wood to receive the trays containing the lead under treatment.
These being charged, the doors are closed, the chamber is warmed and the floor
is covered with a layer of acetic acid, the vapours of which act on the lead. After-
wards air and carbonic anhydride are admitted in quantities suitably regulated
by valves or dampers while the temperature is also regulated as required for the
process, all the regulation being effected outside the chamber. When the
process is completed, the chamber is thoroughly ventilated and then the doors can
he opened to give access for removing the white lead produced and charging the
chamber again.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is:
A chamber for the manufacture of white lead having under its floor channels for
air and carbonic anhydride opening into the chamber above its floor, also under its
floor an air space containing steam pipes and communicating with spaces in hollow
walls having controllable passages to the chamber and having in its roof valved
pipes leading to a chimney substantially as and for the purpose set forth.
Dated this 1st day of June 1898.
ABEL & IMRAY
Agents for the Applicants: