It will be observed that the parts between each key lever and escapement operate independently of the others, so that a number of cams may be in engagement with the rollers at one time, and a number of escapements at different stages of their action at one time. The matrices falling from the magazine descend through the front channels and are received on the inclined belt _F_, on which they are carried over and guided on the upper rounding surface of the assembler entrance-block _f1_, by which they are guided downward in front of the star-wheel _f2_, which pushes them forward one after another. The spaces or justifiers _I_, released from their magazine _H_, as heretofore described, descend into the assembler _G_ in front of the star-wheel in the same manner as the matrices. The line in course of composition is sustained at its front end by a yielding finger or resistant _g_, secured to a horizontal assembler slide _g2_, the purpose of these parts being to hold the line together in compact form. [Illustration: Fig. 7.] As the matrices approach the line, their upper ends are carried over a spring _g3_, projecting through the assembler face-plate from the rear, as shown in Fig. 7, its purpose being to hold the matrices forward and prevent them from falling back in such a manner that succeeding matrices and spaces or justifiers will pass improperly ahead of them. The descending matrices also pass beneath a long depending spring _g4_, which should be so adjusted as barely to permit the passage of the thickest matrix. [Illustration: Fig. 8.] [Illustration: Fig. 9.] After the composition of the line is completed in the assembling elevator _G_, as shown in Fig. 8, the elevator is raised as shown in Fig. 9, so as to present the line between the depending fingers of the transfer-carriage _N_, which then moves to the left to the position shown by dotted lines in Fig. 9, thereby bringing the line into the first elevator _O_, which then descends, carrying the line of matrices downwards, as shown in Fig. 10, to its position in front of the mold and between the confining jaws _P_, _P_, mounted in the main frame, which determine the length of the line. Figs. 11 and 12 show the casting mechanism in vertical section from front to rear. When the first elevator _O_ lowers the line, as just described, the mold and the pot _M_ stand in their rearward positions, as shown in Fig. 11. [Illustration: Fig. 10.] [Illustration: Fig. 11.] The mold-carrying wheel is sustained by a horizontal slide, and as soon as the matrix line is lowered to the casting position, a cam at the rear pushes the slide and mold wheel forward until the front face of the mold is closed tightly against the rear face of the matrix line, as shown in Fig. 12. [Illustration: Fig. 12.]