5.2019516 ELCAN 7x50 roof-prism binocular

On 23 Mar, 2020 By rosenfel@chass....
  1. catalogue number: 5.2019516;
  2. name of artifact: “ELCAN (Ernst Leitz Canada) 7x50 roof-prism binocular”;
  3. date of production: 1974-1977;
  4. materials of manufacture: optical glass, coatings?, black anodized housing, with original Canadian Armed Forces’ issued green cloth case, and filters in the CAF issued green leather case;
  5. maker: Ernst Leitz Canada, Midland ON;
  6. provenance: purchased on eBay by the museum Director, from a vendor in Ottawa ON;
Continue Reading

4.2019518 REL 7x50 Porro prism binocular

On 21 Mar, 2020 By rosenfel@chass....
  1. catalogue number: 4.2019518;
  2. name of artifact: “REL (Research Enterprises Limited) 7x50 Porro prism binocular”;
  3. date of production: 1945;
  4. materials of manufacture: optical glass, black-enamelled metal, pebble leather covering;
  5. maker: Research Enterprises Limited (REL), Leaside ON;
  6. provenance: purchased on eBay by the museum Director, from a vendor in England;
Continue Reading

JRASC April 2020

On 10 Mar, 2020 By james@jamesedgar.ca

Inside this issue:

  • Cepheid Variables in Andromeda
  • Supernova Redshifts
  • 2019 Awards

This is a biggie, with 64 pages, lots of interesting articles by the regular columnists, glorious astroimages, and two meaty research papers.
And, what about that gorgeous cover image by Peter and Debra Ceravolo?

Continue Reading

3.2019416 Ball Spherometer

On 10 Mar, 2020 By rosenfel@chass....
  1. catalogue number: 3.2019416;
  2. name of artifact: ball spherometer, 6-cm diameter X 6.2-cm height, three legs;
  3. date of production: ca. 1900-1950;
  4. materials of manufacture: brass, with some nickel plating(?), and black enamel(?) paint;
  5. maker: manufacturer “NO”, England or continental Europe?
  6. provenance: i) purchased on eBay by the museum Director, from a vendor in England;
  7. condition: restored by museum director;
Continue Reading

2.2019326 Vixen “Replica of Isaac Newton's original reflector telescope”

On 09 Mar, 2020 By rosenfel@chass....
  1. catalogue number: 2.2019326;
  2. name of artifact: “Replica of Isaac Newton's original reflector telescope” (wording of the manufacturer);
  3. date of production: ca. 2018/2019?;
  4. materials of manufacture: optical glass, modern coatings, blackened metal, some plastic, with a faux-wood finish on part of the OTA, copper-alloy name plate on the top of the base, two eyepieces (“Plössl” design?);
  5. maker: Vixen Optics, Saitama, Japan;
Continue Reading

1.201931 Huson Star Globe

On 09 Mar, 2020 By rosenfel@chass....
  1. catalogue number: 1.201931;
  2. name of artifact: Huson Star Globe;
  3. date of production: 1975;
  4. materials of manufacture: lacquered printed paper gores on papier mâché and wood support, copper alloy, and hardwood box;
  5. maker: H. Hughes & Son Ltd., London;
  6. provenance:
    Continue Reading

    Messier

    On 07 Mar, 2020 By blair.s@shaw.ca
    Continue Reading

    The Sky This Month - March 2020

    On 01 Mar, 2020 By garyboyle@xplor...

    The Ultimate Challenge

    Standing under a dark country sky on a moonless night, our eyes drink in a couple of thousand stars as well as visible planets. This alone is a wonder but once we use the magnification of a telescope, fainter objects now reveal their subtle detail. Amateur astronomers not only use their telescopes to magnify what the unaided eye sees but hunt down the elusive galaxies, star clusters and nebulae.

    Continue Reading

    WideField Astroimaging Certificate - Stuart Heggie

    On 23 Feb, 2020 By james@jamesedgar.ca
    Continue Reading

    The Sky This Month - March 2019

    On 22 Feb, 2020 By garyboyle@xplor...

    Canis Major


    Continue Reading

    Pages

    Subscribe to RASC RSS