Microscopes are important tools in the world of science, technology, biology, chemistry, and physics, and almost every branch of science that requires the expertise of a microscope. Among the necessity that requires the need of a microscope is the fact that certain minute organisms are never visible in the eye of a human, thus, the need for microscope is very much high. In this case, the place of microscope in the heart of everyone is very much indispensable and no wonder, no other instrument will be able to replace, at least to parallel, the present place of a microscope in the heart of every scientist, student, expert, inventor and many more.

Microscope comes in different type. Through the advent of time, more and more kinds of microscope have sprouted, each having a specific function. Through the course of time, more and more microscopes were invented by a lot of people. What a simple microscope invented by lowly glassmakers in the 17th century has now evolved into becoming a clan of microscopes with different functions, belonging in different types and family.

Read the rest of this article »

TrueVision Microscopes, Inc. is a microscope-dealing store based on St. Louis, Missouri. The very essence of this company is the dealing and selling of first-class, both low- and high- powered microscopes of complex kinds and types. Not only does TrueVision Microscopes Inc. sell microscopes. This company too sells a lot of microscope accessories, like microscope lenses, microscope slides, USB for microscopes, and even cameras for microscopes.

No other microscope company offers any better services in terms of microscopes and microscopy than TrueVision Microscopes, Inc. Here is a business so dedicated to this profession that the workers and the owner all give all of their heart for the betterment of the service that they are offering to their customers. That is why; this St. Louis, Missouri-base company is growing both in prestige and in size as one the fledgling and leading microscope dealing company not only in the continental United States but also through the world, spanning seven seas and five continents.

Read the rest of this article »

An Electronic Device,in which the flow of Electrons is through a Vaccum is known as Vaccum Tube.

A Vaccum Tube usually contains a Cathode which is called as Electron Emitter,an Anode which is called as plate (which is electron Collector) and one or
more Electrodes called as Grids,for controlling the flow of Electrons between the Cathode and Anode.

These Electrodes are housed in highly evacuated glass envelope.The Anode is held at Positive Potential with respect to Cathode,so that Emitted Electrons
are attracted to Anode to provide Current in Vaccum Tube.

Read the rest of this article »

The substance used for Electron Emission is known as an Emitter.An Emitter should have the following Properties.

01)High Melting Point:-

As Electron Emission takes place at very High Temperatures,therefore,the substance used as Emitter should have High Melting Point.

02)Low Work Function:-

Read the rest of this article »

The substance used for Electron Emission is known as Emitter or Cathode.The Cathode is heated in an evacuated space to emit Electrons.

As Cathode is sealed in Vaccum,therefore,the most convenient way to heat it is Electrically.The heating processes may be done by two methods.The Thermionic Cathode are devided into two types,

01)Directly Heated Cathode
02)Indirectly Heated Cathode

Read the rest of this article »

From my previous post,you come to know about “Emission of Electrons”.This Electron Emission can be classified in four different types.The details about that
four types are as below.

The External Energy which is used for Emission of Electrons,may come from variety of sources such as Heat Energy,Energy stored in Electric Field,Light
Energy or Kinetric Energy of the Electric Charges Bombarding the Metal Surface.

Read the rest of this article »

At Room Temperature,the Thermal Energy in the Conductor is adequate to break the bonds of the Valence Electrons and leave them unattached to any one
Nucleus.These Unbound Electrons moves at random within the Conductor and are known as Free Electrons.

If an Electric Field is applied across the Conductor,these Free Electrons move through the Conductor in an orderly manner,thus constituting Electric Current.

Read the rest of this article »

The Branch of Engineering which deals with Current Conduction through a Vaccume or Gas or Semiconductor is known as Electronics.

Electronics mainly deals with Electronics Devices and their utilization.Such Devices have valuable properties which enable them to function and behave as
the friend of Human today.

Electronics has gained much importance due to its numerous application in Industry.

Read the rest of this article »

To Measure Average Velocity of Different Methods can be used.Out of that Floats and Pitot Tube is already covered in earlier posts.In this post I will cover “Current Meter” which is used to Measure Average Velocity of Flow.This Average Velocity of Flow is required to Measure the River Discharge

Current Meter:-
It consist of a Wheel containing Blades or Cups which are Rotate by the Flowing Water.A Electric Current is supplied to Wheel by means of Wire.

Read the rest of this article »

For various purpose,the Measurment of River Discharge is required.It requires lot of Skill and the Accuracy.To Measure the Discharge of River,we require

01)Area of Flow

Read the rest of this article »