Les signaux sonores / The sound signals

Les signaux sonores / The sound signals (HM2D1P)

Location: Rimouski, Québec G5M 1L8 Rimouski-Neigette
Country: Canada
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N 48° 31.07', W 68° 28.093'

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Les signaux invisibles
Par temps de brume, le feu du phare est inutile. Entrent alors en jeu les signaux sonores. Cette station en a utilisé et testé plusieurs. Au début du 20e siècle, le Ministère en avait fait un site d'expérimentation; un ingénieur y vivait même en permanence. Sa résidence est ensuite devenue celle du gardien, puis celle de son assistant.
1. Le canon à brume 1859-1894
Lorsque les conditions l'exigent, le gardien provoque une détonation toutes les demi-heures. Même s'il tire à blanc, cette manœuvre comporte des risques.
2. Les bombes explosives 1894-1903
Les bombes explosives sont des pétards de fulmicoton suspendus à une longue perche, que le gardien allume toutes les 20 minutes. Leur son porte plus loin que celui du canon.
3. La sirène d'Écosse 1903-1904
Ce sifflet fonctionne à air comprimé. Il est déclenché par le passage de l'air à travers un cylindre rotatif. Le bâtiment du criard de brume, le plus vieux du site, a été construit pour abriter cet appareil, le moteur à compression et le réservoir d'air.
4. Le diaphone 1904-1972
Le



diaphone ressemble à la sirène d'Écosse : le résonateur, la source d'énergie et le système d'admission de l'air sont identiques. Toutefois, son sifflement est produit par un piston alternatif.
5. Le criard à brume électronique 1972-1997
Avec l'automatisation, on remplace le diaphone par un criard électronique moins puissant, mais déclenché par un lecteur de visibilité.
[Légendes photo, dans le sens des aiguilles d'une montre, en partant du haut à gauche, lisez]
· Une série de cornets à l'essai, en 1903.
· Derrière le bâtiment, un rail semi-circulaire permettait d'orienter le cornet en fonction de la direction du vent. Le cornet du criard mesurait 3,6 mètres de longueur et 1 mètre de diamètre à son ouverture.
· Perche à laquelle étaient suspendus les pétards de fulmicoton.
· Le canon à brume date du règne de George IV (1820-1830).
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Invisible signals
Lighthouse lights were useless once the fog rolled in. Enter the sound signal. This station trialed and used a number of them. At the start of the 20th century, the department designated it as a test site, and an engineer even took up permanent residence. His quarters were later occupied by the lightkeeper, and then by his assistant.
1. Fog cannon 1859-1894
When visibility was poor, the lightkeeper detonated the fog cannon every half hour. This was a risky manoeuvre, even when firing blanks.
2. Explosives 1894-1903
The lightkeeper suspended explosive guncotton firecrackers on a long pole and lighted them at 20 minute intervals. The sound carried farther than that of the fog cannon.
3. The Scotch siren 1903-1904
This whistle used compressed air. It was triggered when air passed through a rotating cylinder. The foghorn building—the oldest on the site—was erected to house this device, its compression motor, and air cylinder.
4. The diaphone 1904-1972
The diaphone was similar to the Scotch siren—with an identical resonator, energy source, and air intake—but its whistle sound was produced by an alternative piston.
5. Electronic foghorn 1972-1997
With automation, the diaphone gave way to a less powerful electronic foghorn that was triggered by a visibility reader.
[Photo captions, clockwise from top left, read]
· Testing a series of horns, 1903.
· A semicircular rail behind the building allowed the horn to be oriented depending on wind direction. The foghorn measured 3.6m long and 1m in diameter at its open end.
· Guncotton firecrackers were suspended from a long pole.
· The fog cannon dates from the reign of George IV (1820-1830).
Details
HM NumberHM2D1P
Tags
Placed ByParks/Parcs Canada
Marker ConditionNo reports yet
Date Added Tuesday, December 25th, 2018 at 4:01pm PST -08:00
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Locationbig map
UTM (WGS84 Datum)19U E 539269 N 5373994
Decimal Degrees48.51783333, -68.46821667
Degrees and Decimal MinutesN 48° 31.07', W 68° 28.093'
Degrees, Minutes and Seconds48° 31' 4.2" N, 68° 28' 5.58" W
Driving DirectionsGoogle Maps
Which side of the road?Marker is on the right when traveling West
Closest Postal AddressAt or near 1034 Rue du Phare, Rimouski Québec G5M 1L8, CA
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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