Skip to main content
  • Utility Menu
  • Search
Harvard Logo
HARVARD.EDU

Collections Menu
  • Waywiser
  • People
  • Bibliography
  • Exhibitions
  • Thesaurus
  • My Object Lists
  • About
  • Sign in
Advanced Search
  • Home
  • Objects
  • galvanometer for pyrometer
  • Images (4)

galvanometer for pyrometer

  • Images (4)

galvanometer for pyrometer

Date: 1910-1920
Inventory Number: 0253
Classification: Galvanometer
Subject:
engineering, heat,
Maker: Hartmann & Braun AG (1879 - 1999)
Supplier: Charles W. Engelhard Sr. (1902-present)
Cultural Region:
United States, Germany,
Place of Origin:
New York, Frankfurt,
Dimensions:
15.6 × 19 × 18.8 cm (6 1/8 × 7 1/2 × 7 3/8 in.)
Material:
glass, brass, steel, iron,
Description:
This is a sensitive meter with a moving coil and short suspension. There are two scales on the dial: 0-17 mV (electric current) and 0-3000°F (temperature). The internal resistance is 1049 ohms. The casing consists of a circular brass case on wooden base with leveling screws and binding posts. There is a short brass suspension tube and a C-shaped magnet.

The base has been numbered "894". There is also an old Harvard inventory number: "5088".
Signedon dial: HB

on dial: Charles Engelhard / Hudson Terminal Buildings / 30 Church Street / New York
Inscribedon dial: D.R.P. [and] MADE IN GERMANY

base numbered: 894
FunctionA galvanometer is an instrument designed to measure the amount of electric current. This one was used with a pyrometer, such as 1998-1-0448.

A pyrometer is an instrument used for measuring the temperature of heat radiating substance. This measurement is based on the Stefan-Boltzmann law. Radiation heat would be focused on thermocouples found inside the pyrometer. These would produce a small electrical current picked up by the binding posts. That current would then be transmitted to a galvanometer such as this one. A reading of the electric current on the dial would directly give, from the second scale on this galvanometer, the temperature of the substance under study.

For a general discussion, go to the following website.
ProvenanceFrom the Engineering School, Harvard University.

Choose Collection

Create new collection

facebook iconTwitter Logo

_______________________________
Join Our Mailing List I Contact
_______________________________
The Collection of Historical Scientific Instruments
Science Center, Room 371 • 1 Oxford Street
Cambridge, MA 02138 •chsi@fas.harvard.edu
p. 617-495-2779 •
f. 617-496-5794
_______________________________
The CHSI is one of the

HMSC Logo

Exhibition Hours

The Putnam Gallery
(Science Center 136):
Monday through Friday, 11a.m. to 4p.m.


The Special Exhibitions Gallery
(Science Center 251):
Monday through Friday, 9a.m. to 5p.m.


The Foyer Gallery
Closed for Installation.

All galleries are closed on University Holidays.

Admission is free of charge.
Children must be escorted by an adult.

Admin Login
OpenScholar
Copyright © 2017 The President and Fellows of Harvard College | Privacy | Accessibility | Report Copyright Infringement

Choose Collection

Create new collection