An Electrical Apparatus by Hartmann and Braun,

An Electrical Apparatus by Hartmann and Braun, Frankfurt, 20th Century. Having two slide wire rheostats, a two key momentary contact switches with terminals each marked Batt(ery) and Galv(anometer), a

Telegraph Accessories and Book with Models to Dismantle, c. 1900-20 1) Insulation tester, Hartmann & Braun, walnut case, with induction apparatus, compartment for dry element and Nippoldt's measuring

Measuring Bridge by Hartmann & Braun, c. 1900 Germany, no. 6326, with 2 marble spindles, galvanometer and 3 rotating switches, in wood carrying case. Meßbrücke von Hartmann & Braun, um 190

2 Hartmann & Braun Precision Amperemeters 1) Astatic electro-dynamic measuring unit, serial no. 62! For 0-25 amperes, integrated bubble level, tiny crack in top glass, original lacquered brass, &#216

zwei unbenutzte Aufkleberbanderolen zur Beschriftung des Werbemodells Hartmann & Braun/1 (Version "Mess- und Regeltechnik", um 1971), sehr gut (Wiking Zubehoer)

12 Precision Measuring Instruments, c. 1870-1900 1) Kohlrausch's universal bridge, no. 1822, Hartmann & Braun, with comparative resistors from 0.1 to 1000 ohms, induction coil and slide resistor, on m

Box Galvanometer with Pointer Reading, c. 1895 Hartmann & Braun, Frankfurt. No. 663, silk thread with moving magnet and aluminum needle under glass dome, 2 electromagnets, scale, in circular walnut ca

Resistance Bridges and Wattmeter, c. 1910 1) Resistance bridge with rheostat by "Hartmann & Braun", no. 667, with earphone. - 2) Precision wattmeter by "Siemens & Halske". - 3) Measuring bridge, 3 ro

Telephone Bridge and Telegraph, c. 1900 1) Nippoldt'sche telephone bridge no. 450, Hartmann & Braun AG, Frankfurt, measuring device with acoustic indication via an integrated receiver. - And: 2) Germa

Electrotechnical Laboratory Devices and Accessories 1) Power-supply unit for voltages up to 260 volts DC. - 2) Grundig/Hartmann & Braun, converted tube measuring device. - 3) BBE Movistrob Type T131.0

German meter instrument made by Hartmann Braun Frankfurt. 13" wide12" tall.

A Filar Suspended Magnetometer by Hartmann and Braun, Frankfurt, Germany, Late 19th/Early 20th Century. Numbered 28. H: 19 1/2 W: 7 1/2 D: 6 1/8 ins. Proceeds to benefit the Case Western Reserve Unive

An Electric Light Source with Scale Holder and Cord by Hartmann and Braun, Frankfurt, Late 19th/Early 20th Century. Used with a reflecting galvanometer or similar instrument. H: 17 1/2 D: 5 1/2 ins.

A Filar Suspended Measuring Device/Instrument by Hartmann and Braun, Frankfurt, Germany, Late 19th/Early 20th Century. H: 11 1/2 W: 12 1/2 D: 11 ins. Proceeds to benefit the Case Western Reserve Unive

Includes mirror, Head-Chin rest stand, Rotary motor dial, Thermometer x 4, Central Scientific Co. electrical post and Walser Automatic Timer. antique medical, antique psychology, antique science

1929 Braun Knecht Heimann Catalog 29. 551 pages. Tears to pages 1-18. Measures 11 in. x 8 in x 1 in. Provenance: Montana private collection. If lot is absent of a condition report one may be requested

Grosse Brett-Skulptur Wohl Kamerun. Holz, weiss, braun und schwarz bemalt. Hochrechteck mit reliefiertem Dekor: Darstellung einer menschlichen Figur und Echsen. Zentral runde Mulde. Am oberen Abschlus

MAURICE BRAUN (American born in Hungary 1877-1941) "Sunny Landscape" Oil on canvas. 20 1/8 x 20 1/8 inches; Frame: 27 x 27 inches. Signed lower right: Maurice Braun. [CONDITION: In overall good condit

Maurice Braun (American, 1877-1941), Autumnal Landscape, oil on canvas, signed lower right, canvas: 19.75"h x 24"w, overall (with frame): 29"h x 33"w

VOLTA ALESSANDRO: (1745-1827) 'To tell the truth, the author's idea of relating electrical phenomena to chemistry is beautiful, it is great and should lead to truth, but such a conception is singularl

[STOCK TICKER]. Edison-type Electrical Industries New York Universal Ticker Machine. Serial number 3812. Model 3-A, 22 Ohms. Lacquered brass mechanism (some tarnishing by age), black painted cast iron

Paper manuscript of 160 pp. numbered plus some white at the end, 160 x 202 mm., written by a single hand, with diagrams, drawings, tables, moving parts, schemes, mostly watercolored, datable to around

in the San Gabriel Mountains; oil on canvas; signed lower right; 16 x 20 inches; 23 x 27 1/4 inches frame

MAURICE BRAUN, 1877 - 41, USA, OIL ON CANVAS H 16" W 20" CALIFORNIA LANDSCAPE Autumn landscape with river. Signed lower right. Frame 22" x 25".