Ed. Kruspe
D.R.G.M. 182 267

No. 182 267. Double cylinder mechanism for brass instruments according to utility model 84 240, with connected lying in a cross from [perpendicular to] the cylinder double valves arranged common chamber control valves. Ed. Kruspe, Erfurt, Daberstedterstr. 9 26 7 02 K. 17112th
This design (shown in detail below) is an improvement over the 1897 D.R.G.M. 84 240 in that it combines the the twin tandem rotors connected by a rod into one double rotor similar to the double rotors of the main valves. The difference is the lack of a separate lever with linkage to the rotor shaft. Here a simple lever connected directly to the rotor shaft is pushed horizontally by the player's thumb.  One example of this horn is found in the collection of the Musikwisssenschlaftilishes Institute of Eberhard Karls Universität Tübingen described as follows:
A 57
Doppelhorn in F1/B1, Ed. Kruspe, Erfurt, 1902 (ex B 22).
Deutsches Reichs-Gebrauchsmuster 182267, 3 Drehventile.

This specimen is missing the lever on the change valve rotor, but it's application is shown in the diagram below.  Much later a double horn with this type of change valve was marketed by the Boston Musical Instrument Company. No known copies of the original documents for D.R.G.M. 182 267 exist. It was superseded two years later by the now familiar D.R.G.M. 232 038 found on the Kruspe "Horner Model."

(Photos courtesy of Stephen Slater)   
The change valve on another specimen (above) is fully intact.  This design was probably very awkward and in fact a third example is known on which the change valve was replaced with the earlier D.R.G.M. 84 240 (1897) dual tandem valve configuration, probably by the Kruspe workshop at the request of the original owner before the invention of the improved version of D.R.G.M. 232 038 (1904).

Very special thanks to Stephen Slater for sharing his photos of the second example.



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