High chromium steels

✍ Scribed by T.K.C.

• Publisher: Elsevier Science
• Year: 1932
• Tongue: English
• Weight: 174 KB
• Volume: 213
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(32)90482-7

✦ Synopsis

April, I932. ]

CURRENT TOI '~CS. 461 Gallium already has been recommended in this country as a filler for quartz thermometers to be used for high temperatures around 500 ° to IOOO ° C. Gallium readily forms alloys and as such may be used for brightening optical mirrors, and as a substitute for amalgam in filling teeth. Gallium should find application in metallic vapor lamps for unlike mercury it gives a spectrum extending into the infra-red region.

T. K. C.

The Exploding Wedge.--The Du Pont Magazine for Feb. r932 describes an innovation in wedges which greatly reduces the labor usually involved in splitting logs of very tough and cross-grained wood. The steel wedge is fitted with a handle inside which is a small strong-walled chamber. In addition, there is a hole through the thicker end of the wedge and into this space the opening of the chamber passes. To operate, the hollow of the handle is loaded with a small charge of black powder, the wedge driven into the log up to the hilt, then a fuse is attached and lighted, . . . . The log is split wide open. T. K. C.