New or Improved Method of Manufacturing Corrugated Roofing or Non-conducting Plates from Felt, Canvas, and similar Fabric or Material.
Year: 1899

page_text: Date of Application, 20th Feb., 1899-Accepted, 15th Apr., 1899
COMPLETE SPECIFICATION.
New or Improved Method of Manufacturing Corrugated Roofing or
Non-conducting Plates from Felt, Canvas, and similar Fabric or
Material.
I, PAUL KNOCH, of No. 37, 38, Juedenstrasse, Berlin, C., in the Empire of
Germany, Manufacturer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention has for object a new or improved method of manufacturing
corrugated roofing or non-conducting plates, which are particularly adapted for
and similar
covering the span-roofs of railway stations, locomotive, carriage,
sheds, and can also with advantage be employed for forming thoroughly reliable
isolating beds in walls, ceilings, &c. for the purpose of deadening sound and
excluding dampness, cold and other atmospheric influences.
There are two methods of producing such plates,-either by using breadths of
felt, or similar breadths composed of a convenient number of superposed layers
of other suitable material or fabric, such as jute-cloth, sack-cloth, canvas or the
The said
like, connected or joined by stitching or in other efficient manner.
breadths are steeped in and saturated with chrome-gelatine in the known manner,
and subsequently, when about half dry, pressed between heated metal plates having
undulatory or corrugated surfaces, corresponding to the sectional shape to be
given to the material under treatment; instead of aforesaid press plates, suitably
fluted rollers may be employed, likewise in a heated state. The material after
having been removed from between the press plates, or after having passed through
the roller press, as the case may be, will rigidly preserve the sectional conformation
imparted to it, and, in order to increase its capacity of resisting moisture, is sub-
sequently subjected to a treatment with acetate of alumina in the known manner.
The outside surface is thereupon coated with asphalt or similar material, while the
inner surface, i.e., that directed towards the interior of the space to be roofed or
isolated, receives a coating of oil-paint which firmly adheres to the rough surface
of the felt. When fixed in position upon the roof framing, the plates have very
great bearing capacity and firmness.
The technical characteristics and advantages of these plates, when compared with.
the ordinary metal roofing plates, especially when used for span-roofs of railway
stations, are as follows:-
The previously unattainable lightness of the plates, whereby the dead weight
of the roof is greatly reduced; this fact is to be considered in the, construction
of the frame work of the roof and will result in great economy in iron or other
material used for constructing the said frame work. A further important advan-
tage consists in the new plates having a practically unlimited durability, as they
are perfectly indifferent against acidiferous fumes, especially the sulphurous acid
of the smoke of locomotives, a quality not possessed by the zinc and iron roofing
plates hitherto in almost general use.
The considerably greater durability of the new plates further effects considerable
economy in the annual outlay for repairs; the iron or zinc roofing of railway

page_text: stations requires more frequently repairs and complete renewal owing to inferior
lasting qualities.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
A new or improved method of manufacturing corrugated plates for roofing and
non-conducting purposes, consisting in saturating-breadths of felt, or breadths
made of several superposed layers of suitable fabric, such as jute cloth, sack cloth,
canvas and the like, with chrome gelatine, said plates when partially dry, being
pressed into corrugated sectional form by means of heated press plates or heated
Huted rollers, and finally, when completely dry and rigid, treated in suitable
manner with acetate of alumina, substantially as set forth.
Dated thi. 201
1000
CAMBIE & WINCKELSETT,
Warwick Buildings, 40, High Holborn, London, W.C.,
For the Applicant.