03-15-2023-1947 - SPUR GEAR

Spur gear

A spur gear has a cylindrical pitch surface and teeth that are parallel to the axis.^[1]

^{https://en.wikipedia.org/wiki/List_of_gear_nomenclature#Pitch_cone}

 

03-15-2023-1945 - pitch helix

The pitch helix is the intersection of the tooth surface and the pitch cylinder of a helical gear or cylindrical worm.^[1]

^{https://en.wikipedia.org/wiki/List_of_gear_nomenclature#Pitch_cone}

03-15-2023-1945 - PITCH CONE

A pitch cone is the imaginary cone in a bevel gear that rolls without slipping on a pitch surface of another gear.^[1]

^{https://en.wikipedia.org/wiki/List_of_gear_nomenclature#Pitch_cone}

03-15-2023-1944 - NOTE IN CONSIDERATION OF THOSE WHO HAVE SACRIFICED OR WHO MAY HAVE BEEN HUMANE AND HAVE OR RETAINED NO PROOF.

NOTE IN CONSIDERATION OF THOSE WHO HAVE SACRIFICED OR THOSE WHO MAY HAVE BEEN HUMANE AND HAVE OR RETAINED NO PROOF. 

DRAFT

03-15-2023-1943 - differential bevel gears (Draft)

A differential is a gear train with three drive shafts that has the property that the rotational speed of one shaft is the average of the speeds of the others. A common use of differentials is in motor vehicles, to allow the wheels at each end of a drive axle to rotate at different speeds while cornering. Other uses include clocks and analog computers.

Differentials can also provide a gear ratio between the input and output shafts (called the "axle ratio" or "diff ratio"). For example, many differentials in motor vehicles provide a gearing reduction by having fewer teeth on the pinion than the ring gear. 

https://en.wikipedia.org/wiki/Differential_(mechanical_device)

Bevel gears are gears where the axes of the two shafts intersect and the tooth-bearing faces of the gears themselves are conically shaped. Bevel gears are most often mounted on shafts that are 90 degrees apart, but can be designed to work at other angles as well.^[1] The pitch surface of bevel gears is a cone, known as a pitch cone. Bevel gears transfer the energy from linear to vertical power, making it very useful in machines widely used in mechanical settings. 

https://en.wikipedia.org/wiki/Bevel_gear

03-15-2023-1942 - epicyclic gear train (also known as a planetary gearset)

An epicyclic gear train (also known as a planetary gearset) consists of two gears mounted so that the center of one gear revolves around the center of the other. A carrier connects the centers of the two gears and rotates the planet and sun gears mesh so that their pitch circles roll without slip. A point on the pitch circle of the planet gear traces an epicycloid curve. In this simplified case, the sun gear is fixed and the planetary gear(s) roll around the sun gear.

An epicyclic gear train can be assembled so the planet gear rolls on the inside of the pitch circle of a fixed, outer gear ring, or ring gear, sometimes called an annular gear. In this case, the curve traced by a point on the pitch circle of the planet is a hypocycloid.

The combination of epicycle gear trains with a planet engaging both a sun gear and a ring gear is called a planetary gear train.^[1][2] In this case, the ring gear is usually fixed and the sun gear is driven. 

https://en.wikipedia.org/wiki/Epicyclic_gearing

03-15-2023-1940 - The Greeks and Romans advanced water clock design to include the inflow clepsydra with an early feedback system, gearing, and escapement mechanism, which were connected to fanciful automata and resulted in improved accuracy.

The Greeks and Romans advanced water clock design to include the inflow clepsydra with an early feedback system, gearing, and escapement mechanism, which were connected to fanciful automata and resulted in improved accuracy. Further advances were made in Byzantium, Syria, and Mesopotamia, where increasingly accurate water clocks incorporated complex segmental and epicyclic gearing, water wheels, and programmability, advances which eventually made their way to Europe. Independently, the Chinese developed their own advanced water clocks, incorporating gears, escapement mechanisms, and water wheels, passing their ideas on to Korea and Japan.^{[citation needed]}

Eschinardi's water clock (Reproduced from Francesco Eschinardi, Appendix Ad Exodium de Tympano)

Some water clock designs were developed independently, and some knowledge was transferred through the spread of trade. These early water clocks were calibrated with a sundial. While never reaching a level of accuracy comparable to today's standards of timekeeping, the water clock was the most accurate and commonly used timekeeping device for millennia, until it was replaced by more accurate pendulum clocks in 17th-century Europe.^{[citation needed]}

^{https://en.wikipedia.org/wiki/Water_clock} 

03-15-2023-1939 - A water clock uses the flow of water to measure time. If viscosity is neglected, the physical principle required to study such clocks is Torricelli's law. There are two types of water clocks: inflow and outflow.

A water clock uses the flow of water to measure time. If viscosity is neglected, the physical principle required to study such clocks is Torricelli's law. There are two types of water clocks: inflow and outflow.

https://en.wikipedia.org/wiki/Water_clock

03-15-2023-1939 - A water clock or clepsydra

A water clock or clepsydra (from Ancient Greek κλεψύδρα (klepsúdra) 'pipette, water clock'; from κλέπτω (kléptō) 'to steal', and ὕδωρ (hydor) 'water'; lit. 'water thief') is a timepiece by which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel, and where the amount is then measured.

Water clocks are one of the oldest time-measuring instruments.^[1] The bowl-shaped outflow is the simplest form of a water clock and is known to have existed in Babylon, Egypt, and Persia around the 16th century BC. Other regions of the world, including India and China, also have early evidence of water clocks, but the earliest dates are less certain. Some authors, however, claim that water clocks appeared in China as early as 4000 BC.^{[2][verification needed]} Water clocks were also used in ancient Greece and ancient Rome, described by technical writers such as Ctesibius and Vitruvius. 

https://en.wikipedia.org/wiki/Water_clock

03-15-2023-1931 - USA NAC DOM CALENDAR, CLOCK, ETC. (DRAFT) [NOTES]

DRAFT

USA NAC DOM

https://en.wikipedia.org/

https://en.wikipedia.org/wiki/Gregorian_calendar

https://en.wikipedia.org/wiki/Pope_Gregory_XIII

 

https://en.wikipedia.org/wiki/Grigory_Mairanovsky

https://en.wikipedia.org/wiki/Soviet_Union

https://en.wikipedia.org/wiki/Germany

https://en.wikipedia.org/wiki/Julian_calendar

https://en.wikipedia.org/wiki/Julius_Caesar

https://en.wikipedia.org/wiki/Rome

https://en.wikipedia.org/wiki/Solar_calendar

https://en.wikipedia.org/wiki/Astronomy

https://en.wikipedia.org/wiki/Lunisolar_calendar

https://en.wikipedia.org/wiki/Geographic_coordinate_system

https://en.wikipedia.org/wiki/History_of_longitude

https://en.wikipedia.org/wiki/Cartography

 

https://en.wikipedia.org/wiki/Hourglass

https://en.wikipedia.org/wiki/Clock

 

https://en.wikipedia.org/wiki/Telegraphy 

 

DRAFT