Chemical balance is invented by lavoisier, the father of analytical chemistry. It is used for weighing with an accuracy of 0.0002 Gram on weighing 200 gram of substance. It consists of the following parts.
- Beam
- Central and terminal knife edged a gate
- Central pillar
- Pans
- Pointer
- Adjusting nuts
- Rider rode
- Rider
- Leveling screws
- Beam arrests
Method of weighing
The article to be weighed is placed in the left pan and approximate weights from the weight box are placed in the right pane of the analytical balance. By terning the key the pointer is allowed to swing the pointer swings indicate whether the weight placed in the pan is less or greater. The Beam make rest by turning the key and replace the weights. The process continued till the difference of the weight is less than 1 gram then fractional weight are added with same process of arresting and releasing the pointer swing till the pointer swing hearly equal on two sides of zero in the scale. The weight below 10 mg is adjusted by placing the raider. Note the weights placed on the right pan of the balance and rider reading. Find out weight of article.
Use of Rider
The adjustment of masses less than 10 mg are made by placing the rider over graduate beam by using Rider Rode. The Beam scale contain 50 devision from middle to end with each division is equal to 0.2 mg
