An Improved Apparatus for Measuring the Humidity of the Atmosphere.
Year: 1893

page_text: COMPLETE SPECIFICATION.
An Improved Apparatus for Measuring the Humidity of the
Atmosphere.
1, ALBRECHT HEIL, of Ober Strasse, Frankisch Krumbach, in the Empire of
Germany, Watchmaker, 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 and accompanying drawing that is to say :-
This invention has for its object an improved apparatus for measuring the
moisture in the atmosphere and it is so arranged that the degree of moisture can
be read off upon a suitable scale.
In the accompanying drawing, which is in illustration of my invention, Figure 1
is a vertical section, and Figure 2 a side view, of the apparatus.
b is a cylindrical chamber or case of sheet metal, having holes a through its sides,
for the admission of air, and at its upper end an inner projecting ring c, c, (Figure 1)
upon which a disc d rests, graduated with the proper divisions and numbers
corresponding with the degrees of moisture required.
Through the centre of this disc passes freely a cat-gut cord or string e to the
upper end of which above the graduated disc is fixed a needle f. Upon the outer
end of the disc is fitted a ring gg upon which rests the glass plate h.
In order to hold down the glass plate upon the ring 9, 9, an outer ring i is used,
the upper edge of which is turned in and down so as to hold down the glass.
The cat-gut e is supported at or near its centre by the wire support k by which it
is prevented from being bent out of shape or injured by a shock or the like, and to
prevent it from being injured by any instrument introduced through the holes in the
case the cat-gut is surrounded by a helical wire guard l.
The lower end of the cat-gut is fixed in a screw m which is screwed through a
socket in the bottom of the case and serves for the adjustment of the needle and
scale.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. For the purpose of measuring and indicating the degree of moisture in the
atmosphere the arrangement of a twisted gut cord fixed at one end and having at
the other end at right angles to its length a needle fixed to it, by which the
variations of moisture in the air in the case vary the degree of twist of the gut, and
point out such variations upon a scale, substantially as described.
2. An arrangement of apparatus for effecting the object described in Claim 1,
consisting of the twisted gut e fixed at its lower end to an adjustable screw and
carrying at its upper loose end a needle f indicating the figures upon a graduated
circle, in accordance with the variations of moisture in the air, substantially as
described and illustrated.
3. In apparatus for effecting the object described in Claim 1, the helical wire/
surrounding the gut cord, and preserving the latter from injury or shock; and the
metal case surrounding the entire apparatus and provided with holes for the
admission of air, substantially as described and illustrated.
Dave on day of my f
EDWARDS & Co.,
35, Southampton Buildings, London, Agents for the Applicant.