Several carbon-filament electric bicycle lamps were produced before 1900, but vibration could break the fragile carbon filament. The acetylene lamp remained more practical than electrical lamps until the advent of the tungsten (metal) filament incandescent bulb, in 1911. The photo below is of a 191...
Various valves and wheels controlled the flow of gas from the central point to each part of the stage, so that by using a team of people, complex lighting fades could be achieved, before the advent of electricity for lighting. According to Richard Pilbrow (Stage Lighting Design: The Art, ...
Various valves and wheels controlled the flow of gas from the central point to each part of the stage, so that by using a team of people, complex lighting fades could be achieved, before the advent of electricity for lighting. According to Richard Pilbrow (Stage Lighting Design: The Art, ...