. Locomotive engineering : a practical journal of railway motive power and rolling stock . A Scotch Block. to two of sand and three parts of crushedstone, such as will go through a 2-inchmesh. The concrete should be put in atleast 12 inches deep, and for 12 inchesaround each side of the foundation. Thecement used should be of the best quality,on account of the strains that are put uponthe foundation, and while it is not neces-sary to go to the expense of getting theimported article, none but the best of do-mestic manufacture should be used. At the present day the standard practiceof connecting
. Locomotive engineering : a practical journal of railway motive power and rolling stock . A Scotch Block. to two of sand and three parts of crushedstone, such as will go through a 2-inchmesh. The concrete should be put in atleast 12 inches deep, and for 12 inchesaround each side of the foundation. Thecement used should be of the best quality,on account of the strains that are put uponthe foundation, and while it is not neces-sary to go to the expense of getting theimported article, none but the best of do-mestic manufacture should be used. At the present day the standard practiceof connecting the home signal with thelever in the tower is to use two lines ofwire, bolt locks, to prevent the signals be-. RocKER Sh.^it Lead-Out. When the home signals are wire-con-nected, a bolt lock should be put in theconnection to the distant signal as well asto the home signal. This is to make itimpossible to clear the distant signal, aswell as the home signal, unless the switchor derail has been properly closed, for if a 755 the wire, for an operator to reverse thehome-signal lever and then give a cleardistant signal when the home signal hadnot been cleared. Connecting the home signal with pipeadmits of the use of a strong and well-designed selector, and one that will act as a bolt lock as well as a selector. Tliisselector is shown in Fig. 7, and, as will beseen consists of two slide bars working ingrooves in a cast base piece, and whichare connected to the two signals to be op-erated, a third slide being provided which as is the case with the pipe-coniiertL-dselector. Differences in design are found in Iht-several devices, whereby the movementof the pipe lines to operate the switchis autoniaticall
Size: 1778px × 1405px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroa, bookyear1892
