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The tempest prognosticator, also known as the leech barometer, is a 19th-century invention by George Merryweather in which leeches are used in a barometer. The twelve leeches are kept in small bottles inside the device; when they become agitated by an approaching storm, they attempt to climb out of the bottles and trigger a small hammer which ...
His best-known invention was the Tempest Prognosticator—a weather predicting device also called "The Leech Barometer". [2] It consists of twelve glass bottles containing leeches, which, when disturbed by the atmospheric conditions preceding a storm, climb upwards, triggering a small whalebone hammer which rings a bell.
Muncie SM420 transmission — 4-speed manual transmission used up to 1967. Very similar to the Muncie SM465 except for small changes to its gear ratios and the location of its reverse gear. Muncie SM465 — 4-speed longitudinal manual transmission used in 1968-1991 Chevrolet 1/2-ton, 3/4-ton, and 1-ton trucks.
The four-speed manual transmission had not been redesigned, and very few V8-equipped Tempest models were built with this transmission. The three-speed manual transmission remained available for all engines. The high-compression 326 V8 engine's output was 260 hp (194 kW; 264 PS) and 352 lb⋅ft (477 N⋅m) of torque (SAE Gross).
No four-speed manual transmission cars were produced. Performance tests from 1977 estimated 0-60 mph (97 km/h) time for the Can Am with the Pontiac engine at about 10 seconds, about the same as the previous year's Le Mans with the 455 , and a 1 ⁄ 4 -mile (0.40 km) time of approximately 17 seconds.
The Trophy 4 engine is a short-stroke, 45-degree inclined [4] inline four created from the right bank of the 389 V8 for the debut of the Tempest in 1961. Its 194.43 cu in (3.2 L) displacement is precisely half of the 389, with an identical bore and stroke of 4 + 1 ⁄ 16 in × 3 + 3 ⁄ 4 in (103.2 mm × 95.3 mm).
2-speed automatic The Powerglide is a two-speed automatic transmission designed by General Motors . It was available primarily on Chevrolet from January 1950 [ 1 ] through 1973, although some Pontiac models also used this automatic transmission after the fire at the Hydra-Matic factory in 1953.
A single overhead camshaft (SOHC) design was introduced by Pontiac in the 1966 model year as the standard engine in the Tempest. Offered also in 1967, the 230 cu in (3.8 L) OHC 6 shared internal dimensions with the overhead valve Chevrolet straight-6 engine it was based on, [ citation needed ] but had unique cast iron block and head castings.
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