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Real Man light, generator, and battery
This should put the current thread about lights and dynamos and
batteries in the shade. Filaments, LEDs, halogens, batteries versus generators--bah! Real men use tandems to charge batteries to power x-ray machines. In 1899, the Strand magazine described how the new-fangled Rontgen rays illuminated bullets in wounded soldiers and how British surgeons in the Sudan used a tandem to run the x-ray department. In 110 F heat, it took two men on a trainer to charge the x-ray machine's battery. (Let's not hear any more complaints about drag, hot weather, feeble generators, or heavy batteries.) The details may interest the electrically inclined: "The pulley of a small dynamo," writes Major Battersby, "was connected by means of a leather strap with the back wheel of a specially constructed tandem bicycle. The required velocity for the dynamo was then obtained. Having carefully adjusted the circuit with the storage battery, and also with the voltmeter and ammeter, the warrant officer took his position on the seat of the bicycle and commenced pedalling. When 15 volts and 4 amperes were registered, the switch close to the handle of the bicycle was opened and the charging of the battery commenced; as the resistance became greater, a sensation of riding up hill was experienced, and the services of an additional orderly requisitioned for the front seat. This bicycle practice was generally carried out in a shade temperature of 110 deg. F., so that everyone was glad when (the switch having been turned off before pedalling ceased, in order to avoid any discharge from the battery) the machine was brought to a standstill." Pictures of the field x-ray machine, suitable for taping to the wall at your local x-ray shop: http://i26.tinypic.com/mvogpf.jpg Picture of the back half of the tandem, ready to charge the battery, which would be hard to haul around even on a tandem: http://i32.tinypic.com/ta22zb.jpg The frame under the seat and forward of the crank shows that it is indeed a tandem, but I don't see the front chain. The PDF is over 50 mb (not searchable). If you're curious and want to see bullets in old x-rays, the article starts at image 160 of 204: http://ia310906.us.archive.org/1/ite...gazine_102.pdf Cheers, Carl Fogel |
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#2
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Real Man light, generator, and battery
On Mar 22, 12:39 am, wrote:
The frame under the seat and forward of the crank shows that it is indeed a tandem, but I don't see the front chain. Timing chains are for wimps. Shaft drive! |
#3
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Real Man light, generator, and battery
On Sat, 22 Mar 2008 10:05:17 -0700 (PDT), Hank
wrote: On Mar 22, 12:39 am, wrote: The frame under the seat and forward of the crank shows that it is indeed a tandem, but I don't see the front chain. Timing chains are for wimps. Shaft drive! Dear Hank, Sneaky 1897 tandem double shaft-drive with typical rear steering: http://www.google.com/patents?id=0rQ..._pages&cad=0_1 Cheers, Carl Fogel |
#4
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Real Man light, generator, and battery
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#5
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Real Man light, generator, and battery
What I want is a deep radar unit capable of informing me when there's
a vehicle approaching the visibility-blocked cross corner ahead, and an infrared spotter that can tell me which of the cars in the line along the curb have someone sitting inside them. -- My email address is antispammed; pull WEEDS if replying via e-mail. Typoes are not a bug, they're a feature. Words processed in a facility that contains nuts. |
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Real Man light, generator, and battery
Werehatrack wrote:
What I want is a deep radar unit capable of informing me when there's a vehicle approaching the visibility-blocked cross corner ahead, and an infrared spotter that can tell me which of the cars in the line along the curb have someone sitting inside them. And a 300GW laser system to vaporize any vehicle which pulls out into your path, without leaving any puncture-causing shrapnel behind. |
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