TI-30
Videos
The TI-30 is a scientific calculator manufactured by Texas Instruments, the first model of which was introduced in 1976. While the original TI-30 was discontinued in 1983 after several design revision
LED display digits of the original TI-30
Demonstration of the so-called "logarithm bug" that exists in some TI-30 models. In both cases, the value of ln(1.0000001) was calculated. The TI-30 Eco RS shows the incorrect answer, but the TI-30X shows the correct answer.
Original TI-30 model (ca. 1979) with LED display
TI-30-II calculator, manual, case and batteries
Slide rule
Videos
A slide rule is a hand-operated mechanical calculator consisting of slidable rulers for conducting mathematical operations such as multiplication, division, exponents, roots, logarithms, and trigonome
TI-30
…another popular scientific calculator, sold for roughly double the price of the TI-30. The TI-30 sold for less than the cost of a professional-grade slide rule. The TI-30 sold an estimated 15 million units during its lifespan from 1976–1983. The original TI-30, a cost-reduced but functionally equivalent version…
Typical ten-inch (25 cm) student slide rule (Pickett N902-T simplex trig)
Cursor on a slide rule
This slide rule is positioned to yield several values: From C scale to D scale (multiply by 2), from D scale to C scale (divide by 2), A and B scales (multiply and divide by 4), A and D scales (squares and square roots).
A normal-sized slide rule sitting inside a 7-foot (2.1 m) teaching model