precision resistance coil
Dateearly 20th Century
Inventory Number1997-1-1221
ClassificationResistance Coil
Subject
Maker
Leeds & Northrup Company
1903 - 1995
User
Chemistry Laboratory, Harvard College
founded 1850
Cultural Region
Place of Origin
Place of Use
Dimensions17.4 × 10.1 × 5 cm (6 7/8 × 4 × 1 15/16 in.)
Material
DescriptionA resistance standard made by Leeds & Northrup. Device consists of a coil of manganin wound on a tube supported in a nickel-plated case.
Two heavy terminals protrude from the hard rubber top for suspension in mercury and connection to a standard bridge set in an oil bath. Each terminal has two binding posts, each with a knurl-edged adjustment screw. The rubber top has a circular opening for access to a center well.
The resistance is 10000 Ohms.
Two heavy terminals protrude from the hard rubber top for suspension in mercury and connection to a standard bridge set in an oil bath. Each terminal has two binding posts, each with a knurl-edged adjustment screw. The rubber top has a circular opening for access to a center well.
The resistance is 10000 Ohms.
Signedinscribed on top: 10000 OHMS / LEEDS & NORTHRUP / PHILADELPHIA / 107655 / MADE IN U.S.A.
FunctionA resistance standard is designed to compare a conductor to a temperature-fixed resistance. In other words, such a device is used to determine the value of an unknown current.
ProvenanceFrom the Chemistry Laboratory, Harvard, Nov. 1950.
Leeds & Northrup Company
Date: 1935-1936
Accessories: storage box
Object number: 1997-1-0227a
Leeds & Northrup Company
Date: 1935-1936
Accessories: storage box
Object number: 1997-1-0227e
Leeds & Northrup Company
Date: 1935-1936
Accessories: storage box
Object number: 1997-1-0227b
Leeds & Northrup Company
Date: 1935-1936
Accessories: storage box
Object number: 1997-1-0227c
Leeds & Northrup Company
Date: 1935-1936
Accessories: storage box
Object number: 1997-1-0227d
Leeds & Northrup Company
Date: 1926-1929
Accessories: storage box
Object number: 1997-1-0227h
Leeds & Northrup Company
Date: 1926-1929
Accessories: storage box
Object number: 1997-1-0227i
Leeds & Northrup Company
Date: 1926
Accessories: storage box
Object number: 1997-1-0227j
Leeds & Northrup Company
Date: 1926-1929
Accessories: storage box
Object number: 1997-1-0227f
Leeds & Northrup Company
Date: 1926-1929
Accessories: storage box
Object number: 1997-1-0227g
