Zeměměřické a astronomické přístroje používané na území ČR od 16. do konce 20. století

astronomical-surveying instruments – Ertel

The manufacturer's name on the device
  • Ertel & Sohn in München
  • telescope G. & S. Merzl in München

Interesting construction features

Information about the use of device

Information about the device condition

  • VÚGTK: S0173
  • Owner: Národní technické muzeum
  • Manufacturer: Ertel
  • Made: 01.01.1830
  • Length: 438 mm
  • Width: 382 mm
  • Height: 297 mm
  • Weight: 19240 g
  • S/N: 

  • cross hairs:
  • NK_037
  • telescope type: reversible
  • type of clamp: clamp on the axis
  • unite: ° ' "
  • variable telescope length: yes
  • telescope length with retracted eyepiece: 415 mm
  • telescope length with extended eyepiece: 435 mm
  • telescope diameter: 33 mm
  • telescope magnification: 30
  • type of optical plummet: none
  • compass: none
  • horizontal circle diameter: 305 mm
  • main reading scale of the horizontal circle: vernier
  • number of reading scales of the horizontal circle: 4
  • the smallest segment of the horizontal circle: 10"
  • setting the horizontal circle to zero: none
  • vertical circle: yes
  • vertical circle diameter: 150 mm
  • main reading scale of the vertical circle: vernier
  • number of reading scales of the vertical circle: 1
  • the smallest segment of the vertical circle: 1'
  • cross level: no
  • altitude buble: no
  • striding level: no
  • designed for work: special work