Home Education Research

Archive for September, 2009

LW Scientific educational microscopes enable convenient and efficient performance of various research procedures in school biology laboratories.Handy Choice for School Laboratory Settings.Exceptional Features of LW Scientific Educational Microscopes.

LW Scientific educational microscopes are integrated with a series of advanced features to enable easy operation and accurate evaluation results. The major features found in advanced LW Scientific Student Advanced 4 microscope models include:
* Four position nose piece * Standard monocular head * 5W fluorescent base * Coarse and fine focus with tension adjustment * Amendable stage stop * 110mm x 110mm stage size * Locked-in eyepiece with pointer installed * Spring-loaded slide clips * Complete metal gearing * 10X/18 wide field eyepiece
LW Scientific Educational Microscopes are also integrated with NA 1.25 ABBE condenser, Iris diaphragm and teaching head. These microscope models are built of heavy cast alloy and provided with reagent and acid resistant finish. They are available in several dimensions with variations in length, width, height and weight measurements. Additionally, majority of these microscope models are provided with accessories including fuses, dust cover, spare bulb and blue and green filters as well. These equipments are also provided with one year warranty both for the materials and electronic components and workmanship.

Here are 3 of the things you need to consider when looking at wind turbines for use on your home or small business:

* 2 or 3 blades – It has been argued by many people as to what number of blades are the “perfect” number. After carefully testing many units over several years in the industry, it has been found and proven that a 3 bladed unit has a better overall balance and therefore can last longer (less wear and tear on the motor and moving parts from imbalance over a long period of time).

* Overspeed Control – A turbine needs to be able to control its own speed in high winds to prevent it from breaking or overheating. Most home units are fitted with a spring-loaded hinge that allows the blades to bend away from the directional (with what’s known as a furling tail) during higher winds to prevent “overspeed”. Some more expensive units will have a braking system (but this is usually only found on the larger commercial size turbines and not typically on the smaller home units).

* Type of Tower – You need to decide what type of tower you want to use for your wind turbine. There are 3 basic types – free-standing lattice, free-standing pole, and a guyed mast with cables supporting it. Which one you choose is dependent on how high your turbine needs to be placed, what ordinances (city or county) you need to comply with, and the ease of getting to the unit for any repairs or maintenance (For Example: Will you have to climb up the tower to get to the windmill? Or can you lower the unit to the ground?, etc., etc.)