 | John Timbs - 1839 - 446 pages
...remarked, that the seasons, as well as the hour of the day, exert considerable influence on the celerity of the operation. The most favourable time is from seven...it often happens that twenty minutes are necessary m the most favourable months, when the objects are entirely in shadow. The latitude is, of course,... | |
 | 1839 - 512 pages
...from seven to three o'clock ; and a drawing which, in the months of June and July at Paris, may'be taken in three or four minutes, will require five...often happens that twenty minutes are necessary in the mostfavourable months, when the objects are entirely in the shadow. The latitude is of course a fixed... | |
 | 1840 - 494 pages
...hour of the day, exert considerable influence on the celerity of the operation. The most favorable time is from seven to three o'clock ; and a drawing...happens that twenty minutes are necessary in the most favorable months, when the objects are entirely in shadow. After what has just been said, it will readily... | |
 | Jacob Bigelow - 1840 - 424 pages
...hour of the day, exert considerable influence on the celerity of the operation. The most favorable time is from seven to three o'clock ; and a drawing...happens, that twenty minutes are necessary, in the most favorable months, when the objects are entirely in shadow. After what has just been said, it will readily... | |
 | Jacob Bigelow - 1840 - 418 pages
...of the day, exert considerable influence on the celerity of the operation. The most favorable lime is from seven to three o'clock ; and a drawing which,...happens, that twenty minutes are necessary, in the most favorable months, when the objects are entirely in shadow. time, very correctly. The latitude is, of... | |
 | Encyclopaedia - 1851 - 276 pages
...favourable ^- time is from seven to three o'clock. A drawing which, in the months of June and July, may be taken in three or four minutes, will require...seven or eight in April and September, and so on, according to the season. Objects in shadow, even during the brightest weather, will require twenty... | |
 | Robert Hunt - 1852 - 324 pages
...favourable time is from seven to three o'clock. 37. A drawing which, in the months of June and July, may be taken in three or four minutes, will require...seven or eight in April and September, and so on, according to the season. Objects in shadow, even during the brightest weather, will require twenty... | |
 | Robert Hunt - 1852 - 380 pages
...9. favourable time is from seven to three o'clock. A drawing which, in the months of June and July, may be taken in three or four minutes, will require...seven or eight in April and September, and so on, according to the season. Objects in shadow, even during the brightest weather, will require twenty... | |
 | Robert Hunt - 1853 - 356 pages
...most favourable time is from seven to three o'clock. A drawing which, in the months of June and July, may be taken in three or four minutes, will require...seven or eight in April and September, and so on, according to the season. Objects in shadow, even during the brightest weather, will require twenty... | |
 | Smithsonian Institution. Board of Regents - 1905 - 1062 pages
...most favorable time is from 7 to 3 o'clock. A drawing which in the months of June and July may l>e taken in three or four minutes will require five or six in May or August, seven or eight in April or September, and so on, according to the season. Objects in shadow, even during the brightest weather,... | |
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Paris, may be taken in three or four minutes, will require five or six in May or August, seven or eight in April and September, and so on in proportion to the progress of the season. These are only general data for very bright or strongly illuminated... 
