 | 1911 - 936 pagine
...Ringelmann of Paris, and is used for estimating the relative blackness of smoke. In making obNo. 2. from a very light gray to almost black. The observer glances from the smoke coming from the chimney to the cards, which are numbered from 0 to 5, determines which card most nearly... | |
 | Samuel B. Flagg - 1912 - 68 pagine
...convenient in line with the chimney. At this distance the lines become invisible, the cards ranging in tint from very light gray to almost black. The observer glances from the smoke coming from the chimney to the cards, determines which card most nearly corresponds with the color... | |
 | 1912 - 430 pagine
...convenient in line with the chimney. At this distance the lines become Invisible, the cards ranging in tint from very light gray to almost black. The observer glances from the smoke coming from the chimney to the cards, determines which card most nearly corresponds with the color... | |
 | 1912 - 774 pagine
...convenient In line with the chimney. At this distance the lines become invisible, the cards ranging In tint from very light gray to almost black. The observer glances from the smoke coming from the chimney to the cards, determines which card most nearly corresponds with the color... | |
 | Frank Lyon, Alfred Walton Hinds - 1915 - 444 pagine
...Gage. feet from the observer and, as nearly as is convenient, in line with the top of the smoke-pipe. At this distance, the lines on the ruled cards are...of the smoke. The number of the card and the time are then recorded. The observations should be frequent. The whole number of observations may then be... | |
 | Frank Lyon, Alfred Walton Hinds - 1920 - 428 pagine
...50 r feet from the observer and, as nearly as is convenient, in line with the top of the smoke-pipe. At this distance, the lines on the ruled cards are...cards and determines which one is nearest in color to th&t of the smoke. The number of the card and the time are then recorded. The observations should be... | |
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At this distance, the lines on the ruled cards are not visible, and the cards appear to be of different shades of gray, ranging from very light gray to almost black. The observer glances from the smoke to the cards and determines which one is nearest... 