Found inside – Page 20Large.oscillating.fans.positioned.close.to.the.ground.provide. ... (6.m).of.the.green.and.mounted.10.feet.(3.m).or.lower.to.maximize.air.move- ... Found inside – Page 37Their drawback is mainly noise . The fan has a high - pitched whine that sounds like the propeller on an ultralight aircraft . The unit I installed was 1 ... Found inside – Page 29An oscillating fan will prevent a continuous direct current of air from blowing on the baby . ... and this normally occurs about once in 3 or 4 hours in a ... Found inside – Page 116There are three main types : 20 - inch window fans , high - velocity circulators , and 12 - inch and 10 - inch oscillating ... fans are much less noisy than a window fan running at its highest speed , but somewhat noisier than an oscillating fan . Found inside – Page 104Six blades , oscillating fans in 12 and 16 - in . rooms and enclosures of medium size where a moderate strong air velocity is desirable . Noise is reduced to a degree consistent with general operating characteristics . ... electrician has access to it at all times and can make his tests or inspection without stopping the motor or delaying production . ... These fans , finished in green ate over a range of 10 per cent above , or enamel , with lacquered brass blades and below , normal voltage . Found inside – Page 63Test results revealed that this kind of acoustic treatment was effective for reduction of fan noise thru broad frequency rang from approach to take - off power ... 10 . Manabu SANO : Unstable Phenomenon of Internal Flow in Wall - Attachment Fluid Amplifier . No . 327 , p . ... The case of the large scale model is reported previously , this unstable phenomenon is an oscillation with almost constant periods . Found inside – Page 977а causes A New Line of Diehl Fans With struction minimizes weight to the last the arc of oscillation may be changed Pressed ... The stem is sufficiently large in diameter although at times a forced draft is to harmonize with the general proporboth desirable and necessary . ... hung 1913 oscillator is the ease by which springs , which absorb the least possible Fan , on amount of vibratory noise , are similar The E. S.. May 10 , 1913 977 ELECTRICAL REVIEW AND WESTERN ELECTRICIAN. Found inside – Page 80The frequency of this tone was quite low , and it was thought that the source of this noise might easily be the fan motors or the ... The third type of motor noise is caused by torsional oscillation of the stator and rotor , excited by the tangential ... If the flux distribution is other than sinusoidal , then it can be shown that the magnetic force will contain additional components at 4 , 6 , 8 , 10 ... times line frequency . Found inside – Page 214Since dB is based on a logarithmic scale, an increase of 10 means that a sound is 10 times more intense or twice as loud to human ears. Found inside – Page 131These oscillating room fans . Patented and computer treasured gifts were given designed to maximize efficiency and minimize to President Reagan and noise and vibration . This fan creates an excephis wife while visiting tionally strong ... Found inside – Page 247Discourage daytime sleeping for more than 3 consecutive hours for a newborn and ... For children who are noise sensitive, an oscillating fan or sleep sound ... Found inside – Page 28These data are used to provide a reference signal for cancellation of any electrical or acoustic fan noise using the optimal filtering technique described ... The board has a 100 kHz maximum sampling rate and a 10 us interchannel time delay . Found inside – Page 367This reduces system total capacity and leads to increase of operating hours ( 21 ) . il- Distributed air by an A / C system ... and excessive noise generation . ... These include : i Directional fluctuation of air movement due to oscillating fan was shown to be particularly effective in ... saving potentials [ 6,10,14 ) . ii - Flexibility of positioning for this type of fan responds favourably to user preference and enables ... Found inside... but the ate some of the noise does also . least efficient of the Many manufactur10 - inch fans in ers offer two types CR's test , to proof fans ... quiet type , more exair - movement or pensive , and probreeze , would be ducing slightly less from two to three noise than the times as ... through accident . ments chiefly concerned are the fan blades and the Oscillating fans are more desirable for most uses motor . Found inside – Page 107The carrier density is more than 10 times larger, and the mobility is 100 times ... the Landau-level fan diagram and evaluated the phase of SdH oscillation. Found inside – Page 5The three main types of portable fans are window , box and oscillating Window fans are mounted in windows to create an airflow ... Ceiling fans work best when the blades are seven to nine feet above the floor and 10 to 12 inches below the ceiling . ... A more expensive but stable , smooth operating fan is better than a cheaper , wobbly , noisy fan . ... During evening hours , or when temperatures are lower than 82 degrees F. , the windows should be opened and the fan turned on to ... Found inside – Page 87Patented and computer thing except a steep , designed to maximize efficiency and minimize chrono - style price noise and vibration . ... Refreshes better than the intermittent panion , strong enough blast of air from an oscillating fan . ... ended up on top of the consumer 38 , 000 HOUR LIGHTBULB magazine ratings reports . ... To take • 1000 - foot range • Digital security code no loss of brightness . your freedom a • 10 - channel select • Hold button You ' ll get 38 , 000 contin• Tone / pulse ... Found inside – Page 788HSCT climb to cruise noise assessment 10 p3975 N94-33491 High performance ... A268525 ) 03 p0929 N94-17543 Controlled oscillation of forebody vortices by ... Found inside – Page 392for the on uses electrical trade Two German fans ' WO German desk fans are to be marketed in this country under the ... The former is a non - oscillating fan for desk or wallmounting , with 10 in . t'ades . ... Twelve ” fans TH run at half this speed on a load of 55 W. Fans are fitted with special ball bearings which cut noise to a ... Found inside – Page 66Desk fans , oscillating fans , hassock fans , and fans on a stand or mounted on a wall are generally classified as circulating fans . If a fan is used directly or ... A portable fan . Noise at high speed , low . Air - moving performance , 1975 c.f.m. Judged to be an average fan in most respects . General Electric , Model ... Model AM10 - a roll - about type — would appear to have the same motor - fan combination . Found inside – Page 581This fan operates at a secure the best results the center of oscillation should slower speed and makes less noise than a 4 - blade ... due to their poor construction . not much larger than one and one - half times the The best place to put a fan in the home is ... However , in later issues several additional on each wall . articles on this subject will appear in this department . when Fans Are Fans Fan 10 to 12 ... Found inside – Page 977A New Line of Diehl Fans With struction minimizes weight to the last the arc of oscillation may be changed Pressed - Metal Body and Base ... The this true of the hospital and sick room , stem is sufficiently large in diameter although at times a forced draft is to harmonize with the ... 1913 oscillator is the ease by which springs , which absorb the least possible Fan , on amount of vibratory noise , are similar The E. S.. May 10 , 1913 977 ELECTRICAL REVIEW AND WESTERN ELECTRICIAN. Found inside – Page 67Other infants are calmed by white noise, such as an oscillating fan in the bedroom. At 10 to 12 months, separation anxiety seems to compound the sleep ... Found inside – Page 39Church AGE sells all types of ELECTRIC FANS number of 57 patrols in the distriet for the year . This was 16 patrols more than ... Lae is also having noise trouble . This time it's the curfew ... Gyrohead Table Models , Fixed Table Fans and 10 in . , 12 in . and 16 in . Oscillating Fans , wall or desk type . For full details and prices ... Found inside – Page 7At transonic tip speeds , according to the TylerSofrin criterion , only the sixth harmonic should cause fan noise to propagate out the duct . Found inside – Page 24110 - INCH ' OSCILLATING FANS Some fans rated below have blades of the “ quiet type , " but are not sold by the manufacturer as “ quiet ” fans . ... Output average ; efficiency good ; guard adequate ; noise average ; construction good . Found inside – Page 581This fan operates at a secure the best results the center of oscillation should slower speed and makes less noise than a 4 - blade high be pointed across the room . ... construction . fans are really little more than toys and have a limited not much larger than one and one - half times the The best place ... FOR OF FANS Wall to Wall Fans 8 - inch 10 to 12 inch 12 - inch 16 - inch Fan 10 to 12 - inch 12 - inch . Found inside – Page 104Six blades , oscillating fans in 12 and 16 - in . rooms and enclosures of medium size where a moderate strong air velocity is desirable . Noise is reduced to a degree consistent with general operating characteristics . ... with live connections in any way , but the electrician has access to it at all times and can make his tests or inspection without stopping the motor or delaying production . ... Direct - current fans will operate over a range of 10 per cent above , or below , normal voltage . Found inside – Page 35Do not allow a fan , particularly the non - oscillating kind , to blow steadily upon exposed surfaces of the body ; this will often ... When used to blow warm air out of a room , a fan should be placed at a distance away from the window that is approximately equal to 172 times the window width . ... Electrical safety , radio interference , noise in operation , and effectiveness in moving air ... 10 - in . , oscillating . Found inside – Page 21Oscillation , instability and control of stepper motors . ... a program that resulted in a 10decibel ( dB ) reduction in the noise of induction motor fans . Found inside – Page 175... be problems by opening a door , window and / or installing an oscillating circulation fan . ... A blower moves a lot of air , but they are noisy ! Found inside – Page 142Oscillating Fan 8. ... To date the system has been used by 10 quadriplegic and 7 cerebral palsy patients. ... Initial Clinical Observations and Comments A. Effect of Environmental Noise The effect of environmental noise on the IRM/NYU voice ... Found inside – Page 207See --- Meyers , John J. , to Eastman Kodak Co. Construction for Decker , Elmer L. 2,807,957 . dampening engine noise . 2,808,122 , 10–1-57 , Cl . 181–33 . Found inside – Page 59Patented and computer thing except a steep , designed to maximize efficiency and minimize chrono - style price noise and vibration . This fan creates ... Refreshes better than the intermittent panion , strong enough blast of air from an oscillating fan . Aerodyto endure ... The specially designed Schotz circuit boosts signal strength up to 10 times ( 30 db of he new Bionaire 700 , no bigger than a table- gain ) ... Found inside – Page 341In the case of oscillating fans it is convenient to be able to start or stop the oscillation without stopping the motor . ... when running at high speed , are entirely too noisy for use in a house or quiet private office , A 12in . fan is usually adequate to any demand of house ... candle power to be required of fame lamps should be 0-30 c.p. ( pentane standard ) , and that they should give this minimum for 10 hours . Found inside – Page 111616 " oscillating Desk fan Sh . 98 862 B - 1 30 % 10 % Electric fans not exceeding 15 Kgs . in weight . Electric fans exceeding 15 ... Attractive designs , colours , shape , finish and smooth running of fans without noise are the main considerations for as Iranian buyer . Besides , switch button ... Motors should be of such strength that it should not get hot after running for 8/10 hours at a stretch . The wing of fans ... Found inside – Page 111616 " oscillating Desk fan Do. Sh . 98 862 B - 1 30 % 10 % Electric fans not exceeding 15 Kgs , in weight . Electric fans exceeding 15 ... Attractive designs , colours , shape , finish and smooth running of fans without noise are the main considerations for as Iranian buyer . Besides , switch ... Motors should be of such strength that it should not get hot after running for 8/10 hours at a stretch . The wing of fans ... Found inside – Page 132Oscillating fans turn back and forth, slowly changing the direction of airflow. ... Fans are not alike in breeze power, noise and vibration levels, ... Found inside – Page 3515 , 700 psi 10 , 900 psi 7600 psi . ... Results here represent mils deflection in 24 hours of als x inch bar 4 - inch span , center - loaded flatwise to 1000 psi ... and spacing Gear Applications An interesting application of a nylon gear is that found on the oscillating fan shown on page 34 . ... In addition , the noise level of the fan was significantly decreased , and a parts cost saving of 65 percent was realized . Found inside – Page 24310. 11. 12. 13. 14. 8. Ensure that the bedroom environment supports sleep (e.g., oscillating fan, white noise, soft lighting, and uncluttered space). Found inside – Page 710. Golub , Robert A .; and Preisser , John S .: Test - Engine and Inlet Performance of an Aircraft Used for Investigating Flight Effects on Fan Noise . Found inside – Page 219The strange thing is that you take the emotional treatment that sound is ... back Hum of computer fan Clicking of hard drive disk Hiss of oscillating fan in ... Found inside – Page 194This year the line the mechanical and electrical stand- oscillating mechanism shown in Fig . of oscillating fans for alternating curpoint , but will ... Few new fans down degree by degree to a minimum blade , slow - speed of 10 deg . total oscillation . ... This fan , it is claimed , is noise- ultraquiet residence type in the 12 - in . Found inside – Page 19The corrective ever , at certain times a disturbing noise With the main spring completely un measure must be free from influence ... The ation depends upon the initial force 10 FE FROM ID . ... and enclosure is It was clear that the fans were causenergy to replace that absorbed by obtained with a small oscillation of the ing the ... Found inside – Page 5464NOISE ON SUPERCONDUCTOR DEVICES Our theoretical computations are compared with experimental data ... layer of 3500 À we found a squared noise voltage of the order of 10 - 21 volt / Hz at about 1 KHz ; this is about 10 times smaller ... Also , no assumptions are made about reconvergent fan - out , redundancy , or the initial state of a sequential circuit . ... At the same time , those input changes that cause circuit oscillation under the unit - gate - delay timing model are identified . Found inside – Page 6-74Reduction of FluidBorne Noise The present trend in construction is towards ... has produced a reduction of 10 dB in outlet noise, see McNulty, 1981 [7.17]. Found inside – Page 3982,143,332 : Jun , 10 . Koch , Ernst , and C. Thomsen , Frankfort - on - the ... Oscillating fan . 2,151,320 ; Mar. 21 . Koch , Harold B. ( See Erline ... Found inside – Page 18... that the AC components of hot-wire signal are amplified 10-1000 times for ... except for the fan noise and hum noise which have no noticeable effects on ... Magazine ratings reports this subject will appear in this department caused by torsional oscillation of the has... General proporboth desirable and necessary uncluttered space )... Motors should be such. 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