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“Bite-Size Bits of Local, National, and Global History”
Smiths Falls, Ontario — Central Canada
 

The underwater view / La vue sous l'eau

 
 
The underwater view / La vue sous l'eau Marker image. Click for full size.
By William Fischer, Jr., October 7, 2018
1. The underwater view / La vue sous l'eau Marker
Inscription.  

The locks before you, replaced by the automated lock in 1974, are the only non-operational locks on the Rideau Canal. Their preservation reflects Parks Canada's commitment to protect and present canal heritage. These locks provide us with an excellent view of what is under the water at other historic Rideau Canal lockstations.

How a lock works...

UPBOUND LOCKAGE
• Boat enters lock, with water at downstream level.
• Lower lock gates are closed.
• Upstream sluice valves are opened to fill lock chamber.
• Water level rises

• Water level is equalized with upstream level.
• Lock gates are opened.
• Sluice valves are closed.
• Boat leaves lock.

DOWNBOUND LOCKAGE
• Boat enters lock, with water at upstream level.
• Lock gates are closed.
• Downstream sluice valves are opened to lower the water level in the lock.
• Water level lowers.

• Water level is equalized with downstream level.
• Lock gates are opened.
• Sluice valves are closed.
• Boat leaves lock.

GATES

The gates of a lock chamber function as doors,

The underwater view / La vue sous l'eau Marker image. Click for full size.
By William Fischer, Jr., October 7, 2018
2. The underwater view / La vue sous l'eau Marker
letting boats in and out of the lock. These gates were originally constructed of oak from stands along the Rideau. The depletion of oak stands here in Ontario has forced the importation of Douglas Fir from British Columbia for gate construction today.

A set of gates lasts approximately 12-15 years. Today gates are constructed at the Rideau Canal shops in Smiths Falls. Originally, they were constructed on site, at the locks, by carpenters and blacksmiths.

[Lock gate illustration captions, on right side of marker, read]
• 1832
Endless chain / crab system

• 1835 Swing bar / crab system

• 1895 Push bar / crab system

• 1966 Hydraulic control system
——————————————
Les écluses devant vous - remplacées par l'écluse automatique en 1974 - sont les seules écluses inutilisées du canal Rideau. Le fait qu'elles soient conservées montre l'engagement du Parcs Canada à protéger les éléments qui témoignent de l'histoire du canal et à les présenter au public. Ces écluses nous font voir ce qui se trouve sous l'eau aux autres postes d'éclusage du canal Rideau.

Fonctionnement d'une écluse...

ÉCLUSAGE AMONT
• Le bateau entre dans l'écluse, au niveau d'eau de l'aval.
• On referme les portes aval.

Non-operational Rideau Canal Lock next to Marker image. Click for full size.
By William Fischer, Jr., October 7, 2018
3. Non-operational Rideau Canal Lock next to Marker
On ouvre les vannes amont pour remplir le sas.
• Le niveau monte.

• Le niveau de l'eau atteint celui de l'amont.
• Les portes s'ourvent.
• On referme les vannes.
• L'embarcation quitte l'écluse.

ÉCLUSAGE AVAL
• Le bateau entre dans l'écluse, au niveau de l'amont.
• Les portes se referment.
• On ouvre les vannes aval pour abaisser le niveau d'eau des le sas.
• Le niveau descend.

• Le niveau de l'eau atteint celui de l'aval.
• Les portes s'ouvrent.
• On referme les vannes.
• L'embarcation quitte l'écluse.

PORTES
Les portes d'un sas fonctionnent comme des portes ordinaires et laissent les bateaux entrer dans l'écluse et en sortir. Elles étaient à l'origine en chêne provenant de peuplements en bordure du canal. Le décroissement de ces peuplements en Ontario a nécessité l'importation du Douglas taxifolié de la Colombie-Britannique avec lequel on construit les portes aujourd'hui..

Les portes durent environ 12 à 15 ans. Aujourd'hui, elles sont fabriquées aux ateliers de Smiths Falls. À l'origine, elles étaient fabriquées sur place, aux écluses, par des charpentiers et des forgerons.

[Légendes des illustrations de la porte verrouillée, à droite du marqueur, lisez]
• 1832
Dispositif à treuil et à chaîne sans fin

• 1835 Dispositif à treuil et à poutrelle pivotante

• 1895 Dispositif à treuil et à poutrelle forcée

• 1966 Dispositif à commande hydraulique
 
Erected by Parks/Parcs Canada.
 
Location. 44° 53.805′ N, 76° 1.228′ W. Marker is in Smiths Falls, Ontario. Marker is on Beckwith Street South (Provincial Highway 15) just south of Canal Street, on the right when traveling south. Touch for map. Marker is on the "island" between the canal locks, south of Smith Falls Combined Lockstation Lock 29a. Marker is at or near this postal address: 34 Beckwith Street South, Smiths Falls, Ontario K7A 2A8, Canada.
 
Other nearby markers. At least 8 other markers are within walking distance of this marker. Smiths Falls (a few steps from this marker); Automated Lock / Une écluse automatique (within shouting distance of this marker); Rotary Club Swimming Pool Stone / La pierre de la piscine du club Rotary (within shouting distance of this marker); Crossroads of the Rideau / À la croisée des chemins (within shouting distance of this marker); Welcome to Combined Locks (within shouting distance of this marker); Parc Victoria Park (within shouting distance of this marker); War Memorial (about 90 meters away, measured in a direct line); HMCS Smiths Falls (about 90 meters away). Touch for a list and map of all markers in Smiths Falls.
 
Also see . . .
1. Rideau Canal National Historic Site. (Submitted on October 29, 2018, by William Fischer, Jr. of Scranton, Pennsylvania.)
2. Rideau Canal Videos. (Submitted on October 29, 2018, by William Fischer, Jr. of Scranton, Pennsylvania.)
3. Rideau Canal - Behind the Scenes: How a Lock Works. (Submitted on October 29, 2018, by William Fischer, Jr. of Scranton, Pennsylvania.)
 
Categories. Man-Made FeaturesParks & Recreational AreasWaterways & Vessels

 
 
Credits. This page was last revised on October 29, 2018. This page originally submitted on October 29, 2018, by William Fischer, Jr. of Scranton, Pennsylvania. This page has been viewed 45 times since then. Photos:   1, 2, 3. submitted on October 29, 2018, by William Fischer, Jr. of Scranton, Pennsylvania.
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