REDTA double-image reduction tachymeter
Date1930-1940
Inventory Number2003-1-0130
ClassificationTheodolite
Subject
Maker
Carl Zeiss Jena
1904 - 1948
Maker
Carl Zeiss (company timeline)
founded 1846
Cultural Region
Place of Origin
Dimensionsupright: 40.3 × 15.8 × 17.5 cm (15 7/8 × 6 1/4 × 6 7/8 in.)
Material
DescriptionThe REDTA instrument by Carl Zeiss Jena has the optical path of a theodolite with self reduction capabilities and a double-image distance meter.
It has a fully reversible verticle range (i.e., it can transit) but a narrow range in azimuth and internal focusing. Three screws on the mounting plate and bubble levels are used to level the instrument.
The instrument has an optical scale. Angles may be read through the microscope next the main telescope eyepiece.
The bullet-shaped case is missing.
It has a fully reversible verticle range (i.e., it can transit) but a narrow range in azimuth and internal focusing. Three screws on the mounting plate and bubble levels are used to level the instrument.
The instrument has an optical scale. Angles may be read through the microscope next the main telescope eyepiece.
The bullet-shaped case is missing.
Signedon top of optical tube assembly: CARL ZEISS / JENA [in lens logo]
Inscribedon optical tube assembly: Redta
serial number on tube assembly: Nr. 60749
FunctionA tachymeter (or tacheometer) is a surveying instrument used for the rapid determination of distances, elevations, and bearings.
Self-reducing double-image tacheometers are based on the system patented by Bosshardt in 1922. The first production model of the Zeiss–Bosshardt (Redta) self-reducing double-image tacheometer came out in 1927.
Self-reducing double-image tacheometers are based on the system patented by Bosshardt in 1922. The first production model of the Zeiss–Bosshardt (Redta) self-reducing double-image tacheometer came out in 1927.
Buff & Buff Manufacturing Company
Date: circa 1905
Accessories: wood case; leather case; right-angle prism; plumb bob; oil flask; tripod (5174b)
Object number: 5174a
Carl Zeiss, Optische Werkstätte, Jena
Date: circa 1902
Accessories: oculars (5); objectives (5); microplanar objectives (2); iris diaphragm; abbe condenser; collars and sleeves for photography; parts box; Leitz object micrometer (1308b); cardioid condenser (1308d); immersion oil bottle (1308c) ; Leitz erecting prism (1308e); standing case with key
Object number: 1308a
Carl Zeiss, Optische Werkstätte, Jena
Date: circa 1898
Accessories: oculars (4): 2, 4, and compensating oculars 6, 8; objectives: AA, DD, a2, and apochromat HI 2.0 mm; triple nosepiece; swing-out condenser with iris-cylinder diaphragm; disk diaphragm and central stop diaphragm; filter; eyepiece micrometer, brush, spare stage clips; large mechanical stage (2006-1-0114b); centering glass (2006-1-0114c) with instructions; magnification tables (2); standing case; key; leather traveling case (2006-1-0114d).
Object number: 2006-1-0114a
Benjamin Cole
Date: 1720-1740
Accessories: sight vane (2), key (box)
Object number: 5253
Carl Zeiss, Optische Werkstätte, Jena
Date: circa 1885
Accessories: objectives (4): A, C, F, and DD; 1 ocular: 5; small-parts box with ocular micrometer case; key; Abbe drawing camera in separate box (1125c); box to hold objectives; standing case.
Object number: 1125
Andrew Yeates
Date: circa 1840
Accessories: case, second eyepiece, plumb bob
Object number: 5235
W. & L. E. Gurley
Date: ca. 1884
Accessories: solar attachment; case; level; green filter; sun shade; tripod (5163b)
Object number: 5163a
