Paper Capacitors

Astronomy

Accession Number: 2018.ast.75.1-2

Description:

These objects are two identical rectangular grey boxes with rounded corners. They both have an orange and blue label stuck to the front of the box giving information about the object. The top of the box is inset slightly. Set vertically into this there are two large porcelain cylinders with metal bolts and appendages on top.

2018.ast.75.1 can be identified by damage to the attached label in the form of a horizontal scratch and a torn section in the upper left quadrant.

Primary Materials: Metal, Porcelain, Paper

Markings:

On the attached sticker: “KVO Kilo Volt Oil
TRANSMITTING CAPACITOR
1 MFD.
CONTINUOUS WORKING VOLTAGE
4000 V.D.C.
CAT. No. CR-14

PAPER CAPACITOR

SPRAGUE PRODUCTS CO.
North Adams, Mass. U.S.A.”

Dimensions (cm):

Length = 9.4, Width = 5.6, Height = 19.5

Condition:

Very Good: Both of these objects are in good condition, with only small surface marks. There is dust on top of both objects. Where the porcelain cylinders meet the metal lid of the object, there is some rust.

2018.ast.75.1: The sticker on the front of the case of the capacitor is torn in two places. The paint is scratched away next to this sticker.

2018.ast.75.2: The sticker is slightly buckled in the centre.

Manufacturer: Sprague Products Co.

Date of Manufacture: Mid-20th Century

Provenance:

This object was likely moved from the David Dunlap Observatory in Richmond Hill in 2008, upon the sale of the observatory. It was stored at the Department of Astronomy and Astrophysics until 2017, when it was moved to a new storage location in McLennan Physical Laboratories.