Sa UNCLASSIFIER ne axis to the secomd section, ye ¢: Pithin long insert. cont and third sections have an inside dianster of 3.875" end odmtain a o nt axial electrode 1.25" in diameter. The corona wire enters thd hemi- fee ‘ -, reatlal end of this electrode and is maintained teat by means of an/internal me high voltage supply connects to this electrode (and the wire) arn a gaitable inmtulator, This dimensional configuration was selécted so ost no corona is produced except in the wire section, Lavras o bs Mee a ~ 8 : Vw ke; ' a Cri Corona is produced at the wire we fourth section contains an axial type of blower designed for aviation use, wt never previously tested at stratospheric altitudes, a sual] pin ends of the assembly are fitted with butterfly valves operated ty eter eounted on the external surface of the tube, of the The active portiohs reting conditions ebout 170 pa at a KS ccouUsS wltege of this device is spproximately 2750 volts and it delivers urnler normal 1150 wolts. This unit together mith a Thoor electrical impulse timer are conteinesd tn«pressurized container a-Si: Fie the high voltage power supply uses a "vitran® (vibrater-transformer) pbperating at aprimary voitage of 4.5 volts, The m-load rectified and filters D.C. a ba () atacspheres air). The circuit used is axtremely simple (Figurel2j. A dual tag on the timer operates ‘two sets of two mritches in accordance with the time settings. The first cam is set to close switches B and Bl after theitine for _ = way j er 4 Vave AB ComMiecr precipitator are lined with 3 mil aluminum foil upon which the samplelis collected. escent has elapsed, (Normally 2 hours}. These switches actuate the ve motor, opening the valves, turning on the high voltage and starting the blower. the set semplingtine (6 hours) at altitude has elapsed, the nor itches A and A+ After closed are actuated, turning off the timer and power supp]y, and teusing the valves to close (through a back contact on the switch, Al, Mower is also turned off by switch Al. A back contact on the blowef nay be used for cutting down the balloon load. The switch Wer for the blower is obtained from a group of silver cells providing 12 volts for 2 ampere hours, Under these conditions (altitude end voltage) ree 100 cfm at altitude and consomes 1.25 amperes. In 6 hours at Ehe blower 200 cfm at wit samples the required 1000 cubic msters. 44.5 volt 3 AH spt of Vertes power the timer, H.Y. supply and valve motor. wtbatteries and pressurised container are housed in an insulated qlusginum ‘inst. The precipitator assembly is spring sounted in a separste aluzinus we frame. The entire assembly incloding batteries ami cables weighs ‘ely 35 pounds, . approxi- cglations indicate that within the range of dust particle sises qf interest, ts oe M, the unit is 100% efficient. Due to the lack of time, efficiency mrtotes not yet been made on this unit. Preparations are now begng made to ret these tests under simlated conditions. The theory of electrostatic Pitation and calculations based on this unit are contained in IppendixD . Cl ° ] : ff... a a] a) —_a5 LOS 1064 00131986 035