Idaho Boyd's Genuine Porcelain Lined Cap Excavation Milk glass Yard

2005.002.003

Catalog Date: 
02/10/2005
Gparent: 
4: T&E For Materials
Classes: 
Canning
Collection: 
Jacobs/Uberuaga House Yard Excavation Collection
Date: 
1870s-1950s
Object Name: 
Lid, Jar
Owned: 
Unknown
Parent: 
Food Processing T&E
People: 
Boyd, Lewis R. Jacobs Uberuaga
Record As: 
Found in Collection
Record Date: 
Nov-04
Record From: 
607 Grove Street front and side yards
Subjects: 
Canning and preserving Cookery Food - Preservation Glass
This type of glass liner for zinc caps was patented March 30, 1869 by Lewis R. Boyd of New York City. This liner was found in the yard at 607 Grove Street during excavation. The glass is "milk glass," meaning that it's a cloudy white. In raised letters on one side, "Boyd's Genuine Porcelain Lined Cap." The word "porcelain" is a misnomer and not originally used by Boyd. This liner was inserted into the bottom of solid zinc caps used on fruit jars in canning. It provided an all-glass contact for the food in the jar and prevented the cap from imparting a metallic taste to the preserved food.
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