Calipers. (open access)

Calipers.

Patent for calipers that make it easier to read measurements, by having a strip of measuring tape at the ends that allows users to determine the distance between the arms easier. The measuring tape component is also retractable.
Date: April 4, 1922
Creator: Miller, William James
Object Type: Patent
System: The Portal to Texas History
Ointment. (open access)

Ointment.

Patent for a general external application ointment made of chloride of zinc, powdered metallic cobalt, blood root, and glycerine.
Date: April 4, 1922
Creator: Mullins, Ervin L. & Collier, William R.
Object Type: Patent
System: The Portal to Texas History
Spontaneous Combustion of Hydrogen (open access)

Spontaneous Combustion of Hydrogen

It is shown by the author's experiments that hydrogen which escapes to the atmosphere through openings in the system may burn spontaneously if it contains dust. Purely thermal reasoning can not account for the combustion. It seems to be rather an electrical ignition. In order to determine whether the cause of the spontaneous ignition was thermo-chemical, thermo-mechanical, or thermo-electrical, the experiments in this paper were performed.
Date: March 4, 1922
Creator: Pothmann, P. & Nusselt, Wilhelm
Object Type: Report
System: The UNT Digital Library
Universal Household Grater. (open access)

Universal Household Grater.

Patent for a new universal grater which eliminates the risk of injury the user may gain from grating materials.
Date: April 4, 1922
Creator: Lambdin, William McKendree
Object Type: Patent
System: The Portal to Texas History