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A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them Curta Type I calculator, top view Curta Type I calculator, bottom view. The Curta is a hand-held mechanical calculator designed by Curt Herzstark. [1] It is known for its extremely compact design: a small cylinder that fits in the palm of the hand.
Expandable water toys (also grow-in-water toys or grow monsters) are novelty items made from a superabsorbent polymer. They are toys that expand after putting them into water for anything from a few hours up to several days, depending on size. They shrink in saltwater or when exposed to air.
Calculator CPU RAM Display Size Physical Size (inches) Contains CAS Year Released Initial MSRP (nominal US$) [1] Use on College Board Standardized Tests [2] Use on ACT Standardized Tests [3] TI-73, TI-73 Explorer: Zilog Z80 @ 6 MHz: 25 KB of RAM, 512 KB of Flash ROM: 96×64 pixels 16×8 characters 7.3 × 3.5 × 1.0 [4] No 1998/2003 95 (TI-73 ...
The first American-made pocket-sized calculator, the Bowmar 901B (popularly termed The Bowmar Brain), measuring 5.2 by 3.0 by 1.5 inches (132 mm × 76 mm × 38 mm), came out in the Autumn of 1971, with four functions and an eight-digit red LED display, for US$240, while in August 1972 the four-function Sinclair Executive became the first ...
Adult males of the parasitic wasp Dicopomorpha echmepterygis can be as small as 139 μm (0.139 mm) long, smaller than some species of protozoa (single-cell creatures); females are 40% larger. [30] Megaphragma caribea from Guadeloupe , measuring 170 μm (0.17 mm) long, is another contender for smallest known insect in the world.
Solar-powered calculators are hand-held electronic calculators powered by solar cells mounted on the device. [1] They were introduced at the end of the 1970s. [2]Amorphous silicon has been used as a photovoltaic solar cell material for devices which require very little power, such as pocket calculators, because their lower performance compared to conventional crystalline silicon solar cells is ...
When a transformer is first energized, a transient current up to 10 to 15 times larger than the rated transformer current can flow for several cycles. Toroidal transformers, using less copper for the same power handling, can have up to 60 times inrush to running current.
Illacme plenipes is a siphonorhinid millipede found in the central region of the U.S. state of California.It has up to 750 legs. One of three known species in the genus Illacme, it was first seen in 1926, but was not rediscovered until 2005, almost 80 years after its discovery, by Paul Marek, then a Ph.D. student at East Carolina University.