. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1847.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 307 Fig. 3, is placed on a level surface as in fig. 4, and the separate pieces of wood are kept in their places by two fixed pieces X Y, with parallel faces. O S, O' S', are two straight bars moveable about O O'. capable of being clamped in any position. Fig. 5, represents the sea le used in reading off the time. The head moves along the bars O S, O' S like a T-square. The slide carries divisions for every 10 minutes, and the
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1847.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 307 Fig. 3, is placed on a level surface as in fig. 4, and the separate pieces of wood are kept in their places by two fixed pieces X Y, with parallel faces. O S, O' S', are two straight bars moveable about O O'. capable of being clamped in any position. Fig. 5, represents the sea le used in reading off the time. The head moves along the bars O S, O' S like a T-square. The slide carries divisions for every 10 minutes, and the circles on it represent the ivory studs on which any required consecu- tive hours are written, as it would be inconvenient to have it of sufficient eogth to hold 12 hours. Let it be required to read oif the times for a train stopping at C and F. Breaks must be made in the time line at C and F, by the contriv- ance, fig. C. Secondly, move the slide and the strips of wood be- twixt X and Y, up or down till the time of starting on the scale falls n the end of the time line at A. Thirdly, move O S, about O, till the other extremity of the time line coincides with the required time of arrival, and then clamp the bar. The scale must be applied lo show the hour and minute coinciding with the breaks at >n and 7t, and this time must be registered in the table. For the return train, I to A, the head of the scale slides along O'S', andihe second and third adjustments have to be made. Few stations have been supposed for illustration, although the advan- tage of using this method is not so apparent in such a case. However great the number of stoppages, it is scarcely possible to make a miatake that will not be detected. If any error be made in making the breaks in the time line, the time table will show either the omission or excess, as the time and station must be read off at each break in the time line, and registered in the tan There is no necessity for having the velocity per hour g
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