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Hi All
I brought yesterday in a second hand book shop, a book called "Flame electricity and the Camera." Printed in 1900, I have the first edition, you can goggle it and it's on the web, a link below.
Anyway the book holds many interesting facts. A device used for wireless telegraphy to convert DC to to pulsed dc between 500 - 2000 times per second. How was it done? - by a jar containing a solution of sulphuric acid. Immersed in the solution is a large lead plate with one terminal attached. Also immersed is a L shaped glass tube containing a platinum wire which protrudes out from glass tube(i suspect the end is sealed water tight). In operation, when a current is passed through the device, the formation of gas bubbles on the wire interrupts the flow of electricity through the solution. (page 226)
Interesting experiment on lighting tubes by covering 2 walls with tinfoil and HV attached and tubes lighting up in the space between. p129-130
Wishing you all a happy new year.
Flame, electricity and the camera; man's progress from the first kindling of fire to the wireless telegraph and the photography of color
I brought yesterday in a second hand book shop, a book called "Flame electricity and the Camera." Printed in 1900, I have the first edition, you can goggle it and it's on the web, a link below.
Anyway the book holds many interesting facts. A device used for wireless telegraphy to convert DC to to pulsed dc between 500 - 2000 times per second. How was it done? - by a jar containing a solution of sulphuric acid. Immersed in the solution is a large lead plate with one terminal attached. Also immersed is a L shaped glass tube containing a platinum wire which protrudes out from glass tube(i suspect the end is sealed water tight). In operation, when a current is passed through the device, the formation of gas bubbles on the wire interrupts the flow of electricity through the solution. (page 226)
Interesting experiment on lighting tubes by covering 2 walls with tinfoil and HV attached and tubes lighting up in the space between. p129-130
Wishing you all a happy new year.
Flame, electricity and the camera; man's progress from the first kindling of fire to the wireless telegraph and the photography of color