The First Two Notes Tube Whistle (G.S.W) With Partition Discovered Stevens & Son. By A. Strauss (Part B) Underconstruction
The article shows the development of the TNT whistle TNTW (Two note tube) known to most collectors as a General Service whistle (G.S.W) , the development stages and periods from the 1840s to 1870s and later.
To part A Stevens & Son History & More.
Part C Dating Stevens Whistles Early and Round Whistles
Part D Stevens Bell Whistles and the Inventor
Stevens & Sons at Darlington Works, 1865 .
2016 was THE BEST in many years ( for me ) in discovering fantastic ground breaking news about whistles , and information about Whistle Makers – Manufacturers,
Some really change all we knew and thought about whistle history , whistory.
While preparing long articles with serious news about unknown whistles and new historical facts , for this blog , I thought of sharing this , since I had some reasons to celebrate today so here is a taste of some of the new findings about Stevens’s whistles and history.
The Invention of the partition or TUBULAR WHISTLE WITH A PARTITION
and two different lengtn chambers . belonging to Richard Porteous and made by J. Stevens & SonPrior to 1866 .
The FIRST KNOWN G.S.W – General Service Whistle , Or
T.N.T – Two Notes Tube Whistle or TNTW a term I prefer .
The Partition is a long rectangular metal sheet inserted within the tube of the whistle’s body; thus dividing the whistle into Two Chambers , then making UNEVEN depth or length to each chamber by shortening the inside part of one chamber so it produces a higher pitch than the longer one .
This could be done by few drops of lead inside one of the chambers, or by making the inside part of the top uneven, or in later years by bending the partition 45 degrees at its end so it cuts one chamber shorter, so the whistle plays two notes of different frequency and pitch at the same time creating a dissonance which has a louder and more alarming sound than a single note. Continue reading The First Two Notes Tube Whistle and The Invention of the Partition, The development of the Police Whistles. Stevens & Sons . By A. Strauss