Comparison of different Telemeter models

Telemeters come in various models, with scales in different resolutions and in different materials. The instruments are named, e.g.: "Wndsn Pocket Telemeter 7x7x500 Brass" describing size; α, S, D, q, and i scales; as well as material.

Quadrant Telemeter feature comparison

  Quadrant Telemeter Mini Quadrant Horary Quadrant Latitude Quadrant Sine Quadrant
Code qTM MHqTM HqTM LHqTM SqTM
Telemeter + + + +
TM scales 7x7x500 7x6x500 12x9x1000 12x9x1000
Eye-to-string length 57 cm 38 cm 38 cm 38 cm
Inclinometer 30° 45° 30° 30°
Transversals Inclinometer only Inclinometer only Inclinometer only +
Slope scale + + + +
Shadow square 10 & 12 10 & 12 20 & 24 20 & 24
Sin/cos arcs & sex scale + + + + +
Tangent diagonal +
Obliquity arc + + + + +
Unequal hour lines + +
Equal hour lines +
Calendarium +
Sexagesimal grid +

Telemeter models

Type Scales Material Precision Notes
α S D q i
Mini Horary
Quadrant
Telemeter
7 6 500 90 45 Brass 0.05° up to 7°
0.1° up to 14°
0.15° up to 21°
nomograph scales for calculations
palm size
quadrant backside
inclinometer scale
unequal hour lines
Quadrant
Telemeter
7 7 500 90 30 Acrylic/Brass 0.05° up to 7°
0.1° up to 14°
0.15° up to 21°
nomograph scales for calculations
credit card size
quadrant backside
transversal inclinometer scale
Expedition
Telemeter
10 10 1000 n/a n/a Acrylic/Brass 0.05° up to 10°
0.1° up to 20°
0.15° up to 30°
nomograph scales for calculations
easy to use with all scales based on decades
Pendant 12 n/a n/a n/a n/a Acrylic/Brass/Copper 0.2° up to 12° only measuring scales
(α = angular size of the object observed; S = known size of the object observed; D = distance from eye to observed object of known size; q = angular size from horizontal, i = angular size from vertical.)

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