A chronograph comprising a minute indicator member, a normal fixed dial which is graduated in minutes, two circular rotary elements which are coaxial with said indicator member and which each have a zero index and a minute graduation which on one of the said elements is retrogressive whereas on the other it is progressive.

An instrument for solving mathematical problems and involves nomograms that enable the manipulation of a straight line to read off the value of a dependent variable when the value of an independent variable is given, thereby computing by means of graphic representation systemmatic solutions to said problems capable of numerical calculation. With this invention there are immovable scales and it is the calculating line that is moved by manipulation to intersect the said scales at read-off points w...

A metronome may have most of the elements of the driving means formed of integrally molded plastic parts, such as the balance wheel and shaft, and the bell wheels may have teeth which are reinforced by semicylindrical working faces and are provided with interlocking hubs.

A circular slide rule for use by scuba divers which coordinates the variables of air tank pressure, depth of submergence, breathing rate, and time and with which a variable may be determined when the others are known. The time available at depth is disposed on a scale formed as two separate parts, the first being from surface to an intermediate depth and the other from the intermediate depth to maximum depth which provides greater accuracy at greater depths, where it is most needed. The discs of...

A clock including second, minute and hour arms terminated at the ends in magnets. The clock is enclosed in a housing having the outer face formed of plastic to transmit magnetic flux. Corresponding small minute, hour and second hands of a magnetic material slidably abut the exterior surface of the plastic and are aligned with the appropriate outer ends of the internal hour, minute and second arms. The hands are magnetically coupled and slide over the outer face to indicate the time.

Age, weight, height, and physical activity of a patient are correlated by means of appropriate scales on axially aligned, rotatably mounted discs or plates to indicate food allowance in calories. Using the food allowance data, the number of days a patient should be on diet are calculated.

A totalizer shifting mechanism for transferring a total from one totalizer element to another totalizer element on the same totalizer line during the same machine cycle including a control member containing a plurality of predetermined positioned control elements mounted on the upper and lower surfaces of the control member, a mechanism for shifting the control member between two positions, and sensing means, controlling the positioning of the totalizer line, for sensing the control elements in ...

Apparatus for resetting a stepable roller of a counting mechanism. The resetting apparatus includes a cam surface that faces the axis of rotation of the roller. The cam surface extends away from the axis and preferably terminates adjacent the circumference of the roller. A finger mounted on a resetting lever is adapted to engage the cam surface. Means are also provided for moving the finger from a position adjacent the axis of rotation toward the circumference of the roller so that the cam surfa...

An optical means for indicating the beat of the seconds of a timepiece includes an obturator mounted under the window in the dial of the timepiece. The obturator is mounted on a shaft having a pinion gear engaging a gear wheel on the escapewheel of the timepiece.

A device for introducing values into a calculating machine has a simplified keyboard with only 10 keys, each bearing a different digit. A control member is connected to each of the keys and a positioning member is connected to one end of the control member. A side plate follows the movement of the control member and has a retaining member on one end. Two shafts parallel to each other are mounted on the device, and a registering device with movable teeth is loosely mounted on one of the shafts fo...