The indicators or stock-tickers of this company were a new device, and were distributed through most of the large brokerage houses of the city. 鲁伯特·萨金特·荷兰.历史性发明.
It geared into a unit drum, just as do speed-indicators and cyclometers. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
Edison's remarks shed a vivid side-light on this extraordinary episode: On Black Friday, he says, we had a very exciting time with the indicators. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
Later on this primitive indicator was supplanted by the Bradley Bridge, a crude form of the Howell pressure indicators, which were subsequently used for many years in the Edison stations. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.