My hobby

I'm an enthusiastic collector of scientific instruments that are required for voltage or current measurement. Well, sometimes other things slip into the collection, just because I adore them.

Below you'll find a listing of some pieces I've collected during the last few years. It is only the beginning of a collection but nevertheless I'm proud of it and it is great fun to deal with them.

It is sometimes quite difficult to get any information about these instruments (e.g. the date of manufacture), especially if the data printed on them is only fragmentary. In these cases I tried to date them by considering the materials used and the workmanship. Since I'm not an expert I probably may not be right in every case. Therefore I'm very grateful for any help and hints to mistakes. Please do not hesitate to contact me!

On the other hand it is sometimes very easy to give a precise description because any required data can be found on the instrument or it is manufactured by a company (e.g. Hartmann and Braun ), that has a special Museum Department where they keep records for all the instruments they have ever built.

MEASUREMENT INSTRUMENTS

INSTRUMENT MANUFACTURER DATE OF MANUFACTURE IMAGE
Wheatstone Bridge
Crompton & Co Ltd,
England

ca. 1880

see me

Wheatstone Bridge
Hartmann & Braun,
Germany

1928

see me

Resitor Decade
Hartmann & Braun,
Germany

ca 1920 ?

see me

mV- & mA-Meter
unknown

ca. 1930

see me

Voltmeter +/- 12V
Siemens & Halske,
Germany

1914

see me

Earthwire Tester
unknown
Germany

ca 1930 ?

see me

LUX - Meter
unknown

unknown

see me

Insulation Indicator
Siemens & Halske,
Germany

ca. 1930

see me

Precision Voltmeter
Siemens & Halske,
Germany

unknown

see me

Insulation Indicator
Siemens & Halske,
Germany

unknown

see me

A/VA - Meter
GBD

ca. 1944

see me

Lichtmarken
Galvanometer
Siemens & Halske,
Germany

unknown

see me



MEDICAL INSTRUMENTS

INSTRUMENT MANUFACTURER DATE OF MANUFACTURE IMAGE
Low Current
Impulse Generator
unknown

ca. 1880

see me



BOOKS

TITLE PUBLISHED BY PUBLICATION DATE IMAGE
The Practical
Electrician's
Electricity

1929

see me

Cyclopedia of Applied
Electricity (8 volumes)
American Technical
Society

1923

none