Zeměměřické a astronomické přístroje používané na území ČR od 16. do konce 20. století
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astronomical-surveying instruments
manufacturers
Ertel
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astronomical-surveying instruments – Ertel
Description
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
Basic data
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:
Technical parameters
cross hairs:
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