Vol. 14, No. 11 - July 25, 2008
440 Maple Avenue East, Suite 201, Vienna, VA
703-242-4670; Fax 703-242-4675
This issue of the CSAA Signals is brought to you by our sponsor:
Please visit csaa.microkey.com for information about its products or
click on the banner above.
Table of Contents
The Benefit of Being Well Grounded - Chauncey F. McCulloh
By John G. Fischer, DGA Security Systems, Inc.
From about 1882 to recent times, alarms have been installed and monitored using the “McCulloh Loop”. But where did this technology come from?
Almost forty years ago, a long-term ADT employee named Fred Gibson set out to confirm the origin of this technology and concluded that by his best estimation, Chauncey F McCulloh invented the technology we know today as the “McCulloh Loop”.
While four other inventors with the name McCulloh (with some spelling variation) filed patents in the late 1800s contributing to the alarm industry, Chauncey McCulloh filed his patent (1882) before the others and clearly described the essential operation of a McCulloh circuit.
Its introduction revolutionized the central station alarm industry, which struggled to provide cost-effective reliable monitoring to a growing list of customers. Direct Wire systems were costly and an inefficient use of circuits. Multiple customers on one loop always faced the risk of losing everyone on the circuit in the event of a single failure. McCulloh would change that.
Find out more about this fascinating man by visiting, www.csaaul.org/mcculloh.html
Relive the excitement and fun of the first Electronic Security Expo (ESX)--download the overheads from the Operations Management Track and look at the meeting photos!
To access the overheads, visit www.csaaul.org/2008ESXOpsMgmtOverheards.html.
To access the meeting photos:
- Visit www.thephotogroup.com.
- Select "Online Proofing."
- Your password is "esx"
- You'll be brought to a page of categories. To select a category, click on it.
- You'll be brought to a page of thumbnails – to enlarge a thumbnail, click on the image
- From the enlarged thumbnail screen, you can download the image – the link is located to the right of the image.
To the right of the image you will see these options:- Add to cart - this selection should be used for photos of which you wish to have a hard copy and want to purchase.
- Free Download - You can select individual images or all images in the category and require no purchase.
If you intend to publish the photos anywhere, please see the photo credit clause below per our contract with The Photo Group: The Photo Group retains all rights to images taken by The Photo Group's photographers at Electronic Security Expo (ESX).
The following photo credit must appear with any image published from ESX in any publication other than marketing collateral or EH Publishing internal publications: © The Photo Group 2008.