Wednesday, November 28, 2007

Apparatus for X-Ray Experiments

From the 1902 F. Gross experimenters' equipment catalog:

You are getting warmer, warmer....

Monday, October 22, 2007

An Early Radio Transmitter

From Alfred N. Goldsmith, "Radio Telephony" (Wireless Press, 1918). The Alexanderson Alternator was an alternative to the spark gap for transmitters. It had a rotating disk with many individual windings such that the edge of the disk could cut magnetic flux lines at a relatively high rate ... perhaps even 100 KHz! These were popular for a while, but eventually transmitting tubes replaced them for continuous signal generation at high power.

Tuesday, October 9, 2007

Monday, September 17, 2007

A Circular Russian Ironclad (fl. 1876)

From a German periodical of the 1870's, and found in the current listings of eBay seller marderll. You'll note the similarity to the Monitor, and unique Russian touches. The Cheesebox on a Raft is now a Cheesebox on a pie-plate.

Friday, August 24, 2007

Old, Not Dumb

That could be me we're talking about. But it's not; it's about the way things were designed and engineered in the old days.

The old days could be four hundred years or four hundred weeks (or, the way things are changing in this singularity space, four hundred days).

I'll see what I can find for you.