Cal6b Calculagraph Manual

Cal6B Calculagraph Manual — Complete Paper

Chapter 1: Historical Context – What is a Calculagraph?

Before diving into the manual, you must understand the why. A Calculagraph is not a stopwatch. It is a duration recorder.

Invented by Henry S. Parmelee in the late 19th century, the Calculagraph was designed to print the start and end times of a telephone call or a manufacturing process directly onto a time card. Unlike a chronograph that uses a sweeping hand, a Calculagraph uses a complex series of cams and levers to move a typewheel.

The CAL6B Evolution:

• CAL6: The base model with a 60-minute register.
• CAL6B: An upgraded variant (the "B" stands for "Improved Brake" or "Balanced" depending on the factory literature). The CAL6B introduced a more robust reset cam and a modified clutch system to prevent "hand flutter" during printing.

These units were typically mounted inside wooden boxes (Western Electric) or metal housings (IBM/Remington Rand). The "manual" we seek typically covers: Setting the typewheels, engaging the clutch, reading the concentric dials, and lubrication schedules.

Key Components (Refer to your unit):

1. The Start/Stop Lever (Top Left): A knurled rod. Push down to start; push down again to stop.
2. The Reset Knob (Right Side): Pulling this resets all hands to zero.
3. The Print Hammer (Bottom): A flat metal bar. When depressed, it presses the paper against the inked typewheels.
4. The Typewheels (Concentric): Unlike a standard stopwatch (Minutes/Seconds), the CAL6B has wheels for Hours, Tenths of an Hour, and Units of 6 minutes (depending on the dial configuration).
5. The Balance Wheel: Located at the bottom of the movement (visible through the inspection port). If it isn't oscillating, the mainspring is broken or the unit is overwound.

Warning: Do not force the reset knob while the movement is running. This is the #1 cause of broken pivots in CAL6B units. cal6b calculagraph manual

11. Use Cases and Examples

11.1 Laboratory Reaction Timing

• Use external sensor to detect reaction start and end; device logs and prints reaction durations with timestamps.

11.2 Workshop Process Timing

• Foot-switch operated tests: start machine, stamp start time, stop on completion; maintain printed run logs for QA.

11.3 Time-and-Motion Studies

• Use interval mode with labeled events to collect operator step durations; export CSV for analysis.

11.4 Preventive Maintenance

• Log equipment run-times with device; schedule maintenance after accumulated runtime thresholds reached.