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class="rss" src="/web/20091030004434im_/http://www.csemag.com/images/cse_rss_icon.gif" alt="RSS" border="0"/></a></span> </div> <p>A Field Guide for Engineers will provide instructional content and inspiration to novice and veteran engineers alike. Covering design, commissioning, troubleshooting, and operations on HVAC and electrical systems and controls, this blog will be informal and fun, and very rich in content. </p> <div id="blogmain"> <div id="blogrss-myyahoo"> <a title="My Yahoo" href="https://web.archive.org/web/20091030004434/http://add.my.yahoo.com/rss?url=http%3A%2F%2Ffeeds2.feedburner.com%2FAFieldGuideForEngineers" target="_blank"><img alt="My Yahoo" src="/web/20091030004434im_/http://www.csemag.com/common/images/dd_btn_yahoo.gif" border="0"/></a> </div> <div id="blogsidebar"> <div class="noindex"> <div class="blogbox"> <div class="rightnavmodulehead">Recent Posts</div> <ul>  <li><h3><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/24738-Current_Loops_Scaling_Resistors_and_Tubular_Screw_Clamp_Terminals.php">Current Loops, Scaling Resistors, and Tubular Screw Clamp Terminals</a></h3></li>   <li><h3><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23904-Fan_and_Duct_Interactions.php">Fan and Duct Interactions</a></h3></li>   <li><h3><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23517-Field_Particle_Count_Measurements.php">Field Particle Count Measurements</a></h3></li>   <li><h3><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23438-Same_MERV_Same_Size_More_Dust_Holding_Capacity.php">Same MERV, Same Size, More Dust Holding Capacity</a></h3></li>   <li><h3><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23437-Bag_Filters_and_VAV_Systems.php">Bag Filters and VAV Systems</a></h3></li>  </ul> <div class="rightnavmodulehead">Recent Comments</div> <ul> <li>Jek95 on <h3><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/24738-Current_Loops_Scaling_Resistors_and_Tubular_Screw_Clamp_Terminals.php">Current Loops, Scaling Resistors, and Tubular Screw Clamp Terminals</a></h3></li> <li>CAFS on <h3><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23438-Same_MERV_Same_Size_More_Dust_Holding_Capacity.php">Same MERV, Same Size, More Dust Holding Capacity</a></h3></li> <li>apeterson on <h3><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23437-Bag_Filters_and_VAV_Systems.php">Bag Filters and VAV Systems</a></h3></li> <li>David Mason on <h3><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23095-Demonstrating_HVAC_Filtration_Savings_with_Data_Loggers.php">Demonstrating HVAC Filtration Savings with Data Loggers</a></h3></li> <li>William Lull on <h3><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23095-Demonstrating_HVAC_Filtration_Savings_with_Data_Loggers.php">Demonstrating HVAC Filtration Savings with Data Loggers</a></h3></li> </ul> <div class="rightnavmodulehead">Most Commented On</div> <ul> <li><h3><a title="Damper tests provide valuable insights. 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href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23095-Demonstrating_HVAC_Filtration_Savings_with_Data_Loggers.php">Demonstrating HVAC Filtration Savings with Data Loggers</a> (5)</h3></li> <li><h3><a title="Condenser Water System Commissioning - Lesson 1" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/11294-Condenser_Water_System_Commissioning_Lesson_1.php">Condenser Water System Commissioning - Lesson 1</a> (5)</h3></li> </ul> <div class="rightnavmodulehead">Archives</div> <ul> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200910.php">October 2009</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200909.php">September 2009</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200908.php">August 2009</a></h3></li> <li><h3><a 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href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200812.php">December 2008</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200811.php">November 2008</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200810.php">October 2008</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200809.php">September 2008</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200808.php">August 2008</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200807.php">July 2008</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200806.php">June 2008</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200805.php">May 2008</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200804.php">April 2008</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200803.php">March 2008</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200802.php">February 2008</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200801.php">January 2008</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200712.php">December 2007</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200711.php">November 2007</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200710.php">October 2007</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200709.php">September 2007</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200708.php">August 2007</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200707.php">July 2007</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200706.php">June 2007</a></h3></li> <li><h3><a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/200705.php">May 2007</a></h3></li> </ul></div> </div> </div> <div class="blogpost"> <h2><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/24738-Current_Loops_Scaling_Resistors_and_Tubular_Screw_Clamp_Terminals.php">Current Loops, Scaling Resistors, and Tubular Screw Clamp Terminals</a></h2> <div class="left"> <img src="/web/20091030004434im_/http://www.csemag.com/photo/89/89902-David_Sellers.jpg" width="62" height="80" alt="David Sellers"/><br/> </div> <div class="blogpostedby"> Posted by <a title="" href="/web/20091030004434/http://www.csemag.com/blog/profile/7916-David_Sellers.php">David Sellers</a> on October 27, 2009 </div> <p>The other day a couple of us were sitting around contemplating picking up the suction and discharge pressure signals from the 4-20 milliamp transducers serving a controller in a package chiller so we could feed the information into a DDC control system with out having to purchase and install pressure transmitters on the refrigeration circuits.   The idea was to add a scaling resistor to ...... <a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/24738-Current_Loops_Scaling_Resistors_and_Tubular_Screw_Clamp_Terminals.php">Read More</a></p> <a title="Comment about this post" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/24738-Current_Loops_Scaling_Resistors_and_Tubular_Screw_Clamp_Terminals.php#comments">Comments (1)</a><br/> </div>  <div class="blogpost"> <h2><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23904-Fan_and_Duct_Interactions.php">Fan and Duct Interactions</a></h2> <div class="left"> <img src="/web/20091030004434im_/http://www.csemag.com/photo/89/89902-David_Sellers.jpg" width="62" height="80" alt="David Sellers"/><br/> </div> <div class="blogpostedby"> Posted by <a title="" href="/web/20091030004434/http://www.csemag.com/blog/profile/7916-David_Sellers.php">David Sellers</a> on October 19, 2009 </div> <p>I recently received an e-mail from a blog visitor asking my opinion about a system they were working on. They had read one of my previous posts where I discussed the impact turning vanes and general fitting geometry can have on elbow pressure losses and were faced with a situation where they had to “shoe horn” an air handling unit into limited space and connect it to a number of du ...... <a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23904-Fan_and_Duct_Interactions.php">Read More</a></p> <a title="Comment about this post" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23904-Fan_and_Duct_Interactions.php#comments">Comments (0)</a><br/> </div>  <div class="blogpost"> <h2><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23517-Field_Particle_Count_Measurements.php">Field Particle Count Measurements</a></h2> <div class="left"> <img src="/web/20091030004434im_/http://www.csemag.com/photo/89/89902-David_Sellers.jpg" width="62" height="80" alt="David Sellers"/><br/> </div> <div class="blogpostedby"> Posted by <a title="" href="/web/20091030004434/http://www.csemag.com/blog/profile/7916-David_Sellers.php">David Sellers</a> on September 30, 2009 </div> <p>In his comments regarding my initial post discussing the filter field trail I am involved with, William Lull, in addition to observing that our efforts to weigh the amount of dust the filters picked up would tell the story also asked if I had a particle counter and if so, would I be taking readings up and downstream of the filters. That’s a good question; after all, as William points out, ...... <a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23517-Field_Particle_Count_Measurements.php">Read More</a></p> <a title="Comment about this post" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23517-Field_Particle_Count_Measurements.php#comments">Comments (0)</a><br/> </div>  <div class="blogpost"> <h2><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23438-Same_MERV_Same_Size_More_Dust_Holding_Capacity.php">Same MERV, Same Size, More Dust Holding Capacity</a></h2> <div class="left"> <img src="/web/20091030004434im_/http://www.csemag.com/photo/89/89902-David_Sellers.jpg" width="62" height="80" alt="David Sellers"/><br/> </div> <div class="blogpostedby"> Posted by <a title="" href="/web/20091030004434/http://www.csemag.com/blog/profile/7916-David_Sellers.php">David Sellers</a> on September 28, 2009 </div> <p>William Lull’s comment that “the tale is told by your before/after weight measurements of the filters to compare the amount of particulate removed in each system” is a good one and I’m looking forward to seeing how much dirt we pick up over the two year trail window.  There can be a really big difference in how much dust a filter is rated to retain as illustrated i ...... <a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23438-Same_MERV_Same_Size_More_Dust_Holding_Capacity.php">Read More</a></p> <a title="Comment about this post" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23438-Same_MERV_Same_Size_More_Dust_Holding_Capacity.php#comments">Comments (1)</a><br/> </div>  <div class="blogpost"> <h2><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23437-Bag_Filters_and_VAV_Systems.php">Bag Filters and VAV Systems</a></h2> <div class="left"> <img src="/web/20091030004434im_/http://www.csemag.com/photo/89/89902-David_Sellers.jpg" width="62" height="80" alt="David Sellers"/><br/> </div> <div class="blogpostedby"> Posted by <a title="" href="/web/20091030004434/http://www.csemag.com/blog/profile/7916-David_Sellers.php">David Sellers</a> on September 27, 2009 </div> <p>In my recent post on my field testing of different filter technologies, I included a chart of the performance of the system with conventional filters on a typical day, which I have reproduced below. What you are looking at is: Total flow (the fuzzy blue line) based on average velocity across the filters, Bag filter pressure drop (the red line) measured with a differential pressure sensor dedicate ...... <a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23437-Bag_Filters_and_VAV_Systems.php">Read More</a></p> <a title="Comment about this post" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23437-Bag_Filters_and_VAV_Systems.php#comments">Comments (1)</a><br/> </div>  <div class="blogpost"> <h2><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23265-Air_Handling_System_Prefilters.php">Air Handling System Prefilters</a></h2> <div class="left"> <img src="/web/20091030004434im_/http://www.csemag.com/photo/89/89902-David_Sellers.jpg" width="62" height="80" alt="David Sellers"/><br/> </div> <div class="blogpostedby"> Posted by <a title="" href="/web/20091030004434/http://www.csemag.com/blog/profile/7916-David_Sellers.php">David Sellers</a> on September 20, 2009 </div> <p>There have been quite a few comments on my recent post where I share my data from a field  trial comparing filter technologies, both on the web site and in the form of e-mail.  So, I thought I would spend a post or two discussing some of the thought I had related to the comments. Generally, they are topics I was going to mention in relation to the filter discussion anyway. Mark comment ...... <a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23265-Air_Handling_System_Prefilters.php">Read More</a></p> <a title="Comment about this post" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23265-Air_Handling_System_Prefilters.php#comments">Comments (0)</a><br/> </div>  <div class="blogpost"> <h2><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23095-Demonstrating_HVAC_Filtration_Savings_with_Data_Loggers.php">Demonstrating HVAC Filtration Savings with Data Loggers</a></h2> <div class="left"> <img src="/web/20091030004434im_/http://www.csemag.com/photo/89/89902-David_Sellers.jpg" width="62" height="80" alt="David Sellers"/><br/> </div> <div class="blogpostedby"> Posted by <a title="" href="/web/20091030004434/http://www.csemag.com/blog/profile/7916-David_Sellers.php">David Sellers</a> on September 13, 2009 </div> <p>Earlier this year, I wrote a string of posts that looked at 4-20 milliamp current loops and how you could interface them with a data logger for monitoring just about anything out in the field. I also did a set of posts that looked at how to build the DC power supply panel you would need to power the current loops if your particular brand of data logger could not do that.  Then, earlier this ...... <a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23095-Demonstrating_HVAC_Filtration_Savings_with_Data_Loggers.php">Read More</a></p> <a title="Comment about this post" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/23095-Demonstrating_HVAC_Filtration_Savings_with_Data_Loggers.php#comments">Comments (5)</a><br/> </div>  <div class="blogpost"> <h2><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/22646-Commissioning_and_Main_Stream_Journalism.php">Commissioning and Main Stream Journalism</a></h2> <div class="left"> <img src="/web/20091030004434im_/http://www.csemag.com/photo/89/89902-David_Sellers.jpg" width="62" height="80" alt="David Sellers"/><br/> </div> <div class="blogpostedby"> Posted by <a title="" href="/web/20091030004434/http://www.csemag.com/blog/profile/7916-David_Sellers.php">David Sellers</a> on September 7, 2009 </div> <p>Well, I guess I now have another long absense from the blog to my “credit”; its been a couple of really hectic months balancing family stuff centering around my Mom’s illness and passing with keeping the work balls up in the air during what is a really busy time for us. Despite the country’s economic woes, in my company’s little corner of the economy, things are ...... <a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/22646-Commissioning_and_Main_Stream_Journalism.php">Read More</a></p> <a title="Comment about this post" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/22646-Commissioning_and_Main_Stream_Journalism.php#comments">Comments (0)</a><br/> </div>  <div class="blogpost"> <h2><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/20683-Hello_Again_Catching_up_and_Links_to_a_Few_Interesting_Insights_and_Web_Sites_I_Encountered_in_my_Absense.php">Hello Again; Catching up and Links to a Few Interesting Insights and Web Sites I Encountered in my Absense</a></h2> <div class="left"> <img src="/web/20091030004434im_/http://www.csemag.com/photo/89/89902-David_Sellers.jpg" width="62" height="80" alt="David Sellers"/><br/> </div> <div class="blogpostedby"> Posted by <a title="" href="/web/20091030004434/http://www.csemag.com/blog/profile/7916-David_Sellers.php">David Sellers</a> on August 2, 2009 </div> <p> Hello again after a somewhat long absence.  Early in July, my grandson and his family where here for our annual trip to the Neskowin Coast for the 4th of July including a home town style parade with dogs and kids in wagons the townsfolk competing in contests for what amounts to the goofiest costume, and of prime importance to Jakie, a chance to sit in a real, live, fire engine. So, I w ...... <a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/20683-Hello_Again_Catching_up_and_Links_to_a_Few_Interesting_Insights_and_Web_Sites_I_Encountered_in_my_Absense.php">Read More</a></p> <a title="Comment about this post" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/20683-Hello_Again_Catching_up_and_Links_to_a_Few_Interesting_Insights_and_Web_Sites_I_Encountered_in_my_Absense.php#comments">Comments (1)</a><br/> </div>  <div class="blogpost"> <h2><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/18577-Learning_By_Doing.php">Learning By Doing</a></h2> <div class="left"> <img src="/web/20091030004434im_/http://www.csemag.com/photo/89/89902-David_Sellers.jpg" width="62" height="80" alt="David Sellers"/><br/> </div> <div class="blogpostedby"> Posted by <a title="" href="/web/20091030004434/http://www.csemag.com/blog/profile/7916-David_Sellers.php">David Sellers</a> on July 1, 2009 </div> <p>I realized as I started to follow up on my previous post about selecting a cable for use in a temporary data logger field deployment with the DC power supply panel that before I could talk about why I might have selected a certain cable, I probably need to talk about about the general construction characteristics of the cables I was looking at.My own knowledge about building wiring practices start ...... <a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/18577-Learning_By_Doing.php">Read More</a></p> <a title="Comment about this post" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/18577-Learning_By_Doing.php#comments">Comments (3)</a><br/> </div>  <div class="blogpost"> <h2><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/18576-Using_the_DC_Power_Supply_Panel_in_the_Field_Picking_Cable.php">Using the DC Power Supply Panel in the Field - Picking Cable</a></h2> <div class="left"> <img src="/web/20091030004434im_/http://www.csemag.com/photo/89/89902-David_Sellers.jpg" width="62" height="80" alt="David Sellers"/><br/> </div> <div class="blogpostedby"> Posted by <a title="" href="/web/20091030004434/http://www.csemag.com/blog/profile/7916-David_Sellers.php">David Sellers</a> on June 30, 2009 </div> <p>To be able to use your DC power supply panel out in the field, at some point, you are going to have to buy some cable or wire to hook up your sensors. Using current loops gives you some flexibility in terms of the exact configuration of the cable you use. Here is a picture of some of the cable types I have used and have sitting around in my shop. From left to right: The light blue cable is a ra ...... <a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/18576-Using_the_DC_Power_Supply_Panel_in_the_Field_Picking_Cable.php">Read More</a></p> <a title="Comment about this post" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/18576-Using_the_DC_Power_Supply_Panel_in_the_Field_Picking_Cable.php#comments">Comments (0)</a><br/> </div>  <div class="blogpost"> <h2><a title="" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/15490-Operating_Data_and_Commissioning_The_Two_Go_Hand_in_Hand.php">Operating Data and Commissioning; The Two Go Hand in Hand</a></h2> <div class="left"> <img src="/web/20091030004434im_/http://www.csemag.com/photo/89/89902-David_Sellers.jpg" width="62" height="80" alt="David Sellers"/><br/> </div> <div class="blogpostedby"> Posted by <a title="" href="/web/20091030004434/http://www.csemag.com/blog/profile/7916-David_Sellers.php">David Sellers</a> on June 16, 2009 </div> <p>Analyzing building data is key to the commissioning process, including the use of trend data from the building energy management system and/or independent data loggers and the ongoing monitoring and analysis of utility data. As a result, the commissioning conference typically includes a number of sessions that are focused on various aspects of building data analysis.  This year was no excep ...... <a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/15490-Operating_Data_and_Commissioning_The_Two_Go_Hand_in_Hand.php">Read More</a></p> <a title="Comment about this post" href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/15490-Operating_Data_and_Commissioning_The_Two_Go_Hand_in_Hand.php#comments">Comments (0)</a><br/> </div>  <a href="/web/20091030004434/http://www.csemag.com/blog/A_Field_Guide_for_Engineers/index1.php">Next &rsaquo;</a> <div id="boombox"> <div class="adtext">Advertisement</div>  <script language="JavaScript" type="text/javascript"> draw_336X280A(); </script> <noscript><a href="https://web.archive.org/web/20091030004434/http://bst.reedbusiness.com/ads/ad' + burstTagId + '-map.cgi/ns/v=2.1S/sz=336x280A/kw=' + sParams + 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