D.O.G—Max, Miriam, Alfredo, Sam, Jacob, Leah

History of Lever

·      Been used since prehistoric times

Ø Cultivation

Ø Excavation

Ø Moving large objects

·      5000 B.C.

Ø Balance scale

Ø Weighed gold (and witches)

·      Steelyard

Ø Added a sliding weight

Ø Enhanced precision

·      1500 B.C.

Ø Shaduf – irrigation device

Ø Lifted containers of water

Ø For runner of crane

History of Scales

·      Used to determine relative weight

·      Oldest existence 2400 BC- 1800 BCE Indus River Valley (Pakistan)

·      Stones were used for weight setting

·      Egypt 1878 BCE

·      Variations of scales-(cheap and inaccurate) were commonly used in 400 BCE by merchants

·      Weight scales were variation (similar) to the balance scale (1600 CE)

·      Spring scales were used to measure weight (1840 common usage)

·      1940’s electronics were put onto making technology and scales more accurate—late 19^th century became accurate enough for universal usage

Malnutrition in Dogs

·      without good nutrition, your animal can suffer from allergies, malnutrition, skin and coat problems, and obesity

·      dogs can be allergic to many things including themselves and get skin caners/rashes

·      more pet dogs are more likely to become overweight than malnourished, however an unbalanced diet such as only meat, even an adequate supply without proper nutrition, can cause malnutrition

·      too much protein can contribute to kidney disease; too much calcium as a puppy can cause bone problems; lack of vitamins raises the risk of cancer; lack of fat can result in poor/dull coat

Types of Scales

·      Spring scale measure weight using Hooke's law, which relates to the stretching or compression of a spring made from a certain material.

·      Digital scales require less expertise than those with mechanical readouts 

·      General ways: hydraulic pressure, pneumatics or bending beams.