. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1839.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 139 squares of the velocities decrease. The cases, therefore, are not so dissimilar as I was at first led to believe from your corre- spondent's observations. March 15, 1839. J. ELY. RAILWAY CURVES. Sir,âAs a subscriber to your tndy valuable journal, I trust you will not deem me too presumptuous in seeking for tlie following information through your journal:â Query.âThe most correct mode for placing a curve of 100 chains radi
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1839.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 139 squares of the velocities decrease. The cases, therefore, are not so dissimilar as I was at first led to believe from your corre- spondent's observations. March 15, 1839. J. ELY. RAILWAY CURVES. Sir,âAs a subscriber to your tndy valuable journal, I trust you will not deem me too presumptuous in seeking for tlie following information through your journal:â Query.âThe most correct mode for placing a curve of 100 chains radius between (V to form) an iS curve, as in the following example, a, a !â 130 chains radius. 100 chains radius. 130 chains radius. would it not be desirable to reverse the curve towards 6? Mr. Brurt's mode for setting out half-widths (when sidelong) for a line of railway is ver;/ tedious. I wish he would inform us if tliere he not a shorter mode than working, as he says,/rom every centre per/. Query.âWliicU is the most correct mode of setting out railway curves ? The method adopted on many lines of railway for determining tlie offset of curves at every chain is thusâtangent squared, divided hy radius, will give the versed sine.* For exampleâIGO cliains radius ^ 1- (â ~ltiu â¢OOG'25, the decimal pro- portion of a chain = versed sine at one chain. By reducing the decimal to inches will give 4'95 inches for the versed sine. Tliis will be, I believe, 1 foot 8 inches for 2 cliains. If I am correct, thus, 22 X 4'95 = 19-80 inches, or nearly 1 foot 8 inches. Hoping to see these matters explained in your next number, I remain, your very obliged servant, 15th March, 1839. An Assistant Engineer. [We have altered our eorrespondent's communication, so as to make it better understood by our readers ; and we also referred his letter to Mr. Brutf for an explanation of that part relative to setting out " widths," and have received the following reply ; and we have also ob- t
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