Method and apparatus for checking fire detectors

A fire detector checking method and device are disclosed for nondestructively verifying the operation of installed fire detectors of the type which operate on the principle of detecting the rate of temperature rise of the ambient air to sound an alarm and/or which sound an alarm when the temperature of the ambient air reaches a preset level. The fire alarm checker uses the principle of effecting a controlled simulated alarm condition to ascertain wheather or not the detector will respond. The checker comprises a hand-held instrument employing a controlled heat source, e.g., an electric lamp having a variable input, for heating at a controlled rate an enclosed mass of air in a first compartment, which air mass is then disposed about the fire detector to be checked. A second compartment of the device houses an electronic circuit to sense and adjust the temperature level and heating rate of the heat source

Detector for inspection of fire alarms

Portable detector tests rate-of-rise temperature devices. Incandescent light bulb is calibrated to produce rate of temperature rise necessary to activate properly functioning alarm

URBAN IMPACT UPON AGRICULTURE AND NONFARM ALTERNATIVES FOR LAND

Land Economics/Use,

AGRICULTURE AND NATURAL RESOURCES IN THE WEST: THE NEXT 100 YEARS

Resource /Energy Economics and Policy,

Formation Response of High Frequency Electromagnetic Waves

Core samples from rock formations respond to electromagnetic radiation based on an effective permittivity, which depends on the conductivity and permittivity of the constituent components of the rock, as well as the geometric structure of these constituents and the frequency of the radiation. This study analyzes the effect, for radiation of 1 to 100 Mhz, of discrete inclusions having a different permittivity from the surrounding medium. The focus is on the effect of certain geometric features, namely, the individual size of the inclusions, their overall volume fraction, the presence of sharp edges, and their aspect ratio. It is found that the volume fraction has the strongest impact on the effective permittivity, linear at first but higher order at higher volume fractions. The aspect ratio of the inclusions has a moderate effect, which is exaggerated in the extreme case of needle-like inclusions, and which can also be seen in a stronger nonlinearity. There is also a possibility that some features in the shape of the inclusion boundaries may influence the frequency dependence of the effective permittivity. Inclusion size and sharp edges have negligible effect

Summer music festivals

Looking for something fun to do this summer? What better way to have fun than check out some nearby festivals, or better yet, get a change of scenery and hit the road for some great live music

Letter from A.J. Clawson & Hannah M. Clawson to James B. Finley

This letter is a word of comfort and a declaration of faith on the part of Andrew Jackson Clawson and his wife Hannah M. Brooke Clawson, Finley\u27s granddaughter. Clawson believes that righteous living brings a reward in heaven and that he himself is ready for death. He wishes that Finley could lecture to his Division about the cause of temperance. He reports on a big church meeting which kept him busy. Abstract Number - 362https://digitalcommons.owu.edu/finley-letters/1560/thumbnail.jp

Letter from A.J. Clawson & Hannah M. Clawson to James B. Finley

Clawson (Andrew Jackson Clawson, husband of Finley\u27s granddaughter Hannah M. Brooke) reports on the health of various relatives, most of whom are well now. He asks Finley to send him the Ohio State Journal for the winter session, and also wants a report on the election for governor as soon as possible. Abstract Number - 405https://digitalcommons.owu.edu/finley-letters/1603/thumbnail.jp