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Tyfon Fog Signals

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Postby Terry_Pepper » Tue May 10, 2005 5:39 pm


Great info Fred.

I wonder if the Tyfons manufactured by Kockums were identical to those manufactured by Leslie - the name certainly sounds more Swedish than English.

Perhaps Leslie purchased the rights to manufacture them here in the USA.

A copy of the manual would be wonderful if you could arrange to get one.
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Postby island » Wed May 11, 2005 5:42 am


Response via email (5-11-05) from Matt Wrobel of the Leslie Company, Tampa, Fla.

"The "TYFON" type whistles/horns were originally manufactured by Kockums of Malamo Sweden. Sometime in the late 1920's early 1930's Leslie purchased the patent rights and continues to manufacture some variations to this day. I do have original Kockums and Leslie catalogs and drawings that date back to the early 1900's.

Yes, Leslie did not produce diaphone horns. The Leslie-Tyfon were steam and air whistles and pretty much the same as the original Kockums design. The Leslie-Supertyfon are air whistles, mainly used on locomotives but are utilized in other applications ( I believe the Sandy Hook New Jersey Light House had one) and were designed and patented by Leslie."
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Postby Terry_Pepper » Wed May 11, 2005 10:58 am


David - It would appear that my thought that Leslie purchased the right to manufacture Tyfons from Cockums was on the mark!

This is getting interesting!
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Postby Fred » Tue Jun 28, 2005 3:30 pm


A quick update,unfortunately I had a couple of extra jobs on this visit to the Calf of Man and only had time to get a couple of photographs and of measurements
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General view
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The Chimes are air operated signalsl of the "Typhon" type where compressed air produces a sound by means of vibrating diaphragms.The timimg of the opening of the valves for this to give the correct character and the opening of the valves themselves is done electrically.The air is compressed using vane-type compressors.
Range aproximately five miles
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One of the chimes is stamped "Hyson KM165"

So far I have not managed to locate any manuals

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Postby Terry_Pepper » Tue Jun 28, 2005 6:16 pm


That is one impressive arrray of Tyfons Fred.

With David's assistance, I managed to locate a source of Leslie and Cockums catalogs from the 1920's and 30's. Copies of same are on their way as I write, and I will share anything interesting I learn from them on receipt.
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Postby Terry_Pepper » Wed Jun 29, 2005 8:52 pm


I was elated to arrive home this afternoon to find the Tyfon information I mentioned in my previous post awaiting in my mail box. One of the included documents is a copy of a 72 page book published in 1928 by Kockums of Malmo Sweden, the original patent holder of the Tyfon design.

Over the coming days, I will transcribe and post some of the information contained. The following information comes from pages 18 and 19 of this book:


The Tyfon is a signal apparatus of high efficiency and reliability and with a very clear tone, its construction differing entirely from that of steam whistles or sirens. The Tyfon is protected by letters of patent in more than twenty countries.

Figure 1 shows a section of a Tyfon for compressed air:

The Tyfon consists of a solid gun-metal body with an inlet pipe (V), a horn (T) of brass or copper, and a diaphragm (M) of phosphor bronze secured by a screw ring (ring nut or cover). The Tyfon is controlled by a valve.

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When the valve is opened the compressed air or steam enters the pipe (V), causes the diaphragm to vibrate and escapes in the form of sound waves through the horn. At each vibration of the diaphragm the inlet pipe is opened and closed completely. Thus, the whole of the driving power is utilized into sound. The diaphragm always vibrates in exactly the same manner and the tone will therefore be even and clear and every signal cut off abruptly.

The pitch of note of the Tyfon is determined by the length of the horn (L) (the distance from the diaphragm to the orifice of the horn.) It can be calculated by dividing the figure 8500 by L, measured in centimeters. If for instance L is 85 cm., the pitch of the note, i.e. number of vibrations per second will be 100 per second.

The actual pitch is however slightly higher than that calculated, due to the conical shape of the horn. The Tyfon has a pitch of note practically the same as an ordinary whistle of the same length. The longer the horn the lower the note.

As the pressure at which the Tyfons have to operate vary considerably, the diaphragms are therefore made from one leaf up to 6 leaves.

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To enable the diaphragms to spring back, when they are forced outwards by the pressure, they are in most cases made slightly concave, so that after being screwed tight in the Tyfon body, the centre presses flat against the orifice of the inlet pipe. If such diaphragms are placed with the concave face inwards the Tyfon will not sound.

Fig 2. Shows various diaphragms and the manner of fitting them in the Tyfon. Every diaphragm is made for use within a certain range of pressures, e.g. from 8 to 12 Atm.


Stay tuned :!:
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