A Method of Extracting Damp from Walls or other Structures.
Year: 1891

page_text: Date of Application, 16th Dec., 1891
Complete Specification Left, 16th Mar., 1892-Accepted, 21st May, 1892
PROVISIONAL SPECIFICATION.
A Method of Extracting Damp from Walls or other Structures.
I, ANDREW DAVIDSON MCKAY of 13 York Street Liverpool in the County of
Lancaster Syrup Refiner, do hereby declare the nature of this invention to be as
follows:-
The object of this invention is to extract in a speedy and economical manner the
damp contained in the walls of houses, buildings, stables, and other erections.
Hitherto the extraction of damp has been attended with great difficulty and
expense, particularly in cases where it is contained in walls which have been
papered or otherwise decorated, and builders and others have employed various
means for this purpose, which have only been partially successful, the best result
being only attained by an expenditure of considerable labour and money.
Now according to this invention, damp can be easily and speedily extracted at a
small cost.
I close the room or building as hermetically as is practicable without any sub-
stantial expense, and expose within it in basins, buckets or the like some chemical
substance (preferably calcium chloride) which is very absorbent of moisture, and
which will retain the moisture it absorbs and not readily part with it.
In a com-
paratively short time, it will be found that the damp disappears from the wall and
unless there is some constant-source from which it is from time to time renewed the
disappearance will be permanent.
Should the moisture be more than sufficient to dissolve or saturate all the
substance employed, it must be removed, and a fresh supply placed in the building.
When the same has remained there for a sufficient time, the whole of the damp will
have been extracted therefrom, and will be combined with the calcium chloride or
other chemical in the basin or other receptacle.
1001
ERNEST SALAMAN,
Patent Agent to the British and Foreign Patents and Trade Marks Society,
61 & 62, Chancery Lane, W.C., Agent for Applicant.
COMPLETE SPECIFICATION.
A Method of Extracting Damp from Walls or other Structures.
ANDREW DAVIDSON MCKAY of 13 York Street Liverpool in the County of
Lancaster Syrup Refiner 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 :-
The object of this invention is to extract in a speedy and economical manner the
damp contained in the walls of houses buildings stables and other erections.
Hitherto the extraction of damp has been attended with great difficulty and
expense particularly in cases where it is contained in walls which have been papered
or otherwise decorated and builders and others have employed various means for
this purpose which have only been partially successful the best result being only
attained by an expenditure of considerable labour and money.
Now according to this invention damp can be easily and speedily extracted at a
small cost.
I close the room or building as hermetically as is practicable without any sub-
stantial expense and expose within it in suitable vessels some chemical substance
D

page_text: (preferably calcium chloride) which is very absorbent of moisture and which will
retain the moisture it absorbs and not readily part with the same but will retain it
and keep it from being re-dissipated by evaporation under the ordinary circumstances
of temperature &c. to which it is there exposed. In a comparatively short time it
will be found that the damp disappears from the walls or other portion of the
structure and unless there is some constant source from which it is from time to
time renewed the disappearance will be permanent. Should the amount of moisture
be more than sufficient to dissolve or saturate all the chemical substance employed
it must when dissolved or saturated be removed and a fresh supply placed in the
building. When the same has remained there for a sufficient time the whole of
the damp will have been extracted therefrom and will be combined with the calcic
chloride or other chemical in the basin or other receptacle.
The exposure may be made in basins buckets or the like but a more effective
mode of carrying out my invention by the use of an apparatus of the following
kind
In
A shallow receptacle or vessel made of earthenware zinc or other suitable
material into which fits a second vessel made of wire ganze perforated metal or
other suitable material leaving a space between the bottoms of the two vessels.
the inner perforated vessel is placed a suitable quantity of calcium chloride or other
suitable absorbent substance and exposed in the room to be dried having first closed
the same as above described.
The calcium chloride as the moisture is absorbed liquifies and falls into the outer
vessel and may be thrown out from time to time and the inner vessel re-charged
till the whole of the moisture is absorbed.
I have found in practice that about one and a half pounds of calcium chloride is
sufficient to extract all the moisture from a very damp room containing one thousand
cubic feet of air space.
The action of this damp extractor is to withdraw from the atmosphere of a room
all the moisture it contains and with the moisture all the microcosmic life.
Having taken hold of the bacteria it destroys them and it thus renders the
apartments dry and sanitary at one operation. It therefore not only removes a
prevalent cause of rheumatic affections but greatly lessens the danger of infection
from zymotic diseases in rooms which have been occupied by those suffering there-
from and this it does at a small cost without trouble danger or inconvenience.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. Extracting damp from walls and other structures by means of calcium chloride
or other absorbent substance substantially as described.
2. The improved method of extracting damp from walls and other structures
substantially as described.
LOND
ERNEST SALAMAN,
Patent Agent to the British and Foreign Patents and Trade Marks Society,
61, Chancery Lane, London, Agent for Applicant.