Concrete is a mixture of aggregates and paste. The aggregates are sand and gravel or crushed stone; the paste is water and portland cement. (The terms cement and concrete are often used interchangeably, but cement is actually an ingredient of concrete... #nspoli
...Cement is the glue that holds concrete together.)
Reinforced concrete means the concrete is poured over a frame, usually steel bars, that give the structure greater strength. #nspoli
Concrete’s prominence as a building material emerged during the early-twentieth century with the creation of reinforced concrete. #nspoli
Not only were the fire station’s walls and piers made from concrete and steel bars, but the face work and mouldings were also constructed entirely of concrete. The station’s appearance today is largely unchanged from 1908. #nspoli
The fire station, the last in Halifax to house horses, was built by George B. Low, one of Halifax’s pioneers in concrete building construction. His proposal for a concrete fire station was unique and had the added advantage of being the lowest-cost option. #nspoli
Low, who was born in Scotland and immigrated to Canada in 1885, also built #Halifax’s first fully concrete building in 1903, the A.M. Bell building on Granville St. #nspoli
A.M. Bell was a retailer that sold, among many other things, #NovaScotia grindstones from #PictouCounty (
). Their name is still seen on the building today. #nspoli
Low also built the Bengal Lancers building on Bell Road and a number of other buildings in #Halifax.
Low partnered with firefighter William B. Fidler who designed the building. #nspoli
#Halifax’s Union Fire Club was founded in 1754, making it the oldest fire service in Canada. The service continued to operate relatively unchanged until the late-1800s when a dispute between the City and the volunteer force ultimately lead to the creation of the... #nspoli
...#Halifax Fire Department in 1896. The department’s establishment led its transition from part-time to full-time firefighters by the end of 1919.
In addition to being an active fire station, Morris Street Engine House is also a bit of a tourist attraction. #nspoli
For example, an e-car has 183 pounds of copper wiring in it because copper is used in every major component from the motor to the inverter and the electrical wiring. There is about four times more copper in an e-car than in a car with an internal combustion engine.
There are about 400 electric cars on Nova Scotia roads - a total of over 73,000 pounds of copper!
An electric car uses 25-50 grams of silver, so Nova Scotia’s 400 e-cars contain about 15,000 grams of it.
The short answer is yes, sinkholes are real but no, they are not a major risk and should not prevent you from enjoying outdoor activities.
Most natural sinkholes are caused by groundwater naturally eroding rocks like gypsum, salt and limestone which are water-soluble. #nspoli
The water erodes the rock, leaving an underground cavern. Eventually, the weight of the rock and earth above the cavern causes the sinkhole to form. Sinkholes can form either gradually (i.e. a small depression appears and perhaps grows larger over time) or by sudden collapse.
The New Campbellton coal mine was opened in 1862 by Charles J. Campbell, a former Member of Parliament, Member of the Legislative Assembly and executive council member. The community had been named Kelly’s Cove but was changed to New Campbellton in 1862 in honour of Mr. Campbell.
A sample of New Campbellton’s coal was sent to the 1865 Dublin Exhibition and “was very favorably noticed by the Judges,” according to a report. #nspoli#cbpoli#novascotia#capebreton#nshistory
Mining built #NovaScotia! #Halifax was founded in 1749 and its first court house is reported to have been built by 1754 on the northeastern corner of Buckingham + Argyle streets. After the building burned in 1789, the courts were temporarily housed in various buildings. #nspoli
In April 1851 a bill to provide Halifax with a county court house was passed. Mr. H.G. Hill, a prominent #Halifax architect, prepared a plan for a wooden building.
However, since the records of the county, wills, deeds and other papers of public office were... #nspoli#novascotia
...to be stored in the court house, it was important that the building be fire-proof. Also, a number of serious fires in #Halifax in 1857 led to the passage of a bylaw that required large buildings be made of stone or brick, so Hill's plans for a wooden building were abandoned.
The Sullivan Creek #coal mine, before and after!
It's one of several mines reclaimed around #AlderPoint#CapeBreton in the late 1900s/early 2000s - examples of how mining makes temporary use of land and then land can be used other ways. #nspoli#cbpoli#novascotia@JaimeBattiste
The first mine in the area was the Scotia Mine, or #NovaScotia Steel & Coal Company No. 4 Colliery, on Toronto Road, which operated on the Sydney Main (Harbour) Seam from 1915 to 1921. #nspoli#cbpoli#novascotia@JaimeBattiste
Coal quality and structural issues (including water inflow) plague the Harbour Seam west of Florence so upon closure of the colliery, production on the Harbour Seam was limited to the Company’s No. 3 Colliery in Florence, which had opened in 1902... #nspoli#cbpoli#novascotia
The person who asked isn’t the only one who has noticed the circles. With satellite images so easy to access on the Internet, others have also noticed them, including the excellent staff @NS_Energy_Mines. #nspoli#cbpoli@MLAChuckPorter@EastHantsNS
They investigated them in the early 2000s, thinking they could be sand/mud volcanoes.
A sand volcano is a cone-shaped landform created by liquefied sand being expelled from underground onto the surface. #nspoli#cbpoli#novascotia@MLAChuckPorter@EastHantsNS