greatly concern those interested in practical weighing results, and thus may be glossed over for the purposes of general discussion. In figure 7 the type is on the rim or tire of the wheel. A wheel might be made, of course, with the type arranged radially on the side of the wheel; and, in some contemporary forms of the typewheel machine, instances of this construction are found. In the operation of a typewheel machine the load on the scale is equilibrated in the conventional manner against a spring or other means. When this is done some member of the lever mechanism, such as a weighbeam, causes rotation of the typewheel about its axis. When equilibrium is reached a figure on the wheel that represents the amount of load is opposite a fixed indicator. A printing hammer is caused to strike a tape or card against the type at that point. The figure at the indicator is impressed upon the tape or ticket. Thus a permanent and legible weight record of the load is obtained without the participation of human faculties in the determination; a practical achievement of the primary purpose of the machine. THE SELECTOR-FINGER MACHINE In the selector-finger machine the essential processes of transmitting load to the indicating mechanism and bringing the weighing system to equilibrium are conventional. The distinctive features are in the weight indexing and printing mechanism. For a five-place machine, that is, one between 9,999- and 99,999-pound capacity, there may be five disks or type bars, one for each place, that carry the digits 0 to 9. The indexing mechanism is designed to arrange the type bars so that the number representing a given load on the scale will be alined in proper sequence for transfer to a tape or ticket. Figure 8 shows a schematic arrangement and a practical development of the indexing mechanism. The diagram illustrates one type sector, selector finger, and selector disk. In the upper central part of the photograph the notched members are the selector disks, or "step cams," for a five-place machine. For each weight value that can be printed by the machine there is one and only one position of the step cams uniquely determined when the system comes to equilibrium under the load on the scale. Thus the weight to be printed is "indexed" for printing at the step cams or selector disks. In the photograph the selector fingers are not visible. They lie in a horizontal plane between the upper end of the vertical bars and the step cams. When a handle is pulled or a button pushed, the upper end of each bar is caused to move toward the step cams, and to continue the motion until the end of the selector finger to which each bar is connected is stopped by making contact with the surface of the corresponding step cam. This causes the lower end of the bar to move in the opposite direction and draw members hinged to the lower ends each carrying the digits 0 to 9 into line at the printing hammer. In this machine the type is on straight bars, and in that detail differs from the diagram where the type is shown mounted on a sector. When the motion is completed the printing hammer strikes against the type, causing a transfer of the alined figures to a tape or ticket. One other necessary function is performed intermediately. After the weight is indexed, the first action in the print ing cycle is to automatically lock the indexing mechanism at the position of equilibrium to prevent destructive effects on the fingers and linkage while the printing mechanism is at work. Otherwise, a sudden change in the load on the scale would set up a motion of the step cams and cause the risk of shearing off the fingers as they move in to make contact. Thus the recording functions of a selector-finger machine are a sort of hop, step, and jump affair. First, the weight to be printed is indexed by the load on the scale; second, the indexing mechanism is locked in the position of equilibrium; and third, the weight is printed. In the operating cycle of the typewheel machine the second step may be omitted, since the mechanical hazards that make it necessary may not occur. In figure 9 is illustrated a 40,000- by 20-pound-capacity automatic weight recorder of the selector-finger type. The dial and recording mechanism are "full capacity"; that is, the use of unit or drop weights is unnecessary to determine the weight of any load between zero and the capacity of the machine. The dial is of the clock type. The small hand shows full thousands on the inner circle, and the large hand shows intermediate values on the outer circle. Weight records are obtained at the ticket guide below the dial face. A duplicate record of weights printed is kept on a tape that rewinds inside the housing. A device that totalizes the weights struck by the printing hammer is shown at the right of the head. At the left is a keyboard "identification" system by which truck numbers or other data associated with the weight are set up manually on the keyboard and automatically printed on the card and tape with the weight. A bull's-eye signal on the face of the machine shows when the weighing function is completed and the mechanism released for printing. FORM OF RECORDS Two forms of records from automatic weight recorders are illustrated in figure 10. The three samples at the right are the "line and index" form of record in which the weight values are established by the position of a fixed line opposite printed figures and lines from the typewheel. In this form, which is characteristic of the record from a typewheel machine, values intermediate to the main graduations may be read, and thus for certain purposes it has outstanding advantages. The form at the left is from a "full figure" printer and is characteristic of the records from a selector finger machine. No weight values intermediate to the graduations are possible. A typewheel machine may be made either as a line and index printer or as a full-figure printer, although the latter is far less common. The selector-finger machine by the nature of its construction is a full-figure printer. REMOTE INDICATIONS The vast developments in the mechanization of industry inevitably brought about a demand for specialized weighing machinery. Among these is a fairly common requirement to deliver weight indications at an office desk or control panel too remotely located from the weighing station to permit the conventional train of levers between the scale and indicator. practical limits are broad enough to greatly enlarge the utility of properties of the necessary circuits, but generally speaking, the weighing machinery. not only determine the load on each scale, but also may perform the weighers at remotely located scales. At the desk the operator may panel that reproduce the weight indications from two primary In figure 11 are shown two remote indicating heads in the same FIGURE 10.-Forms of printed records from automatic weight recorders. sibilities are limited somewhat by the power facilities and electrical identically reproduced at the remote or secondary station. The poselectrical hook-up the weight indications at the primary station are weighing station a regular machine such as shown in figure 9. By an This has been worked out, using as a primary instrument at the |