Document pb1v0qYe1odobRGZG2n91dyX

i#81 gggssr / Anniston, Alstom Xp, H. o.Hehner Monsanto, Illinois v ->f ^ s r"\ Kay 27, 1948 '&. ** ,- , J J1 'A, '.'* Messrs. R.L. Jenkins - C.B. Dorgin .^Edgar B. Hardy *F#A. Barker JF, gtickley - Monsanto, Illinois T*H, Sftoeloek - Ph. <31s. St. Louis ,v/ - Jp*> !5a Dielectric Testing ,........ .t... 'T? - ! -JO,' - -'IK*: - Ito test methods used In Aroclor analyses tore teen revised fbr a cus tomer mho is getting started in tto use of Aroelor. For your perusal, X am enclosing a copy of our methods* The attached set of methods In clude our electrical tests on Pyranol* ^A Since our Pyranol production as shipped to 0.E. is not used for transformsz$ we do not make the dielectric strength test, Equipment Is available in the Research Department for thfs^to^-Sfl it becomes neces sary to make the teat on short notice. Tho^73.if.ir,Npv'^77-46T is fol lowed in our dielectric strength measurements. The equipment used by the Analyti and resistivity measurements are Massachusetts. y for dielectric constant ral Radio Company, Cambridge, For resistivity, s General Radio Megohm Bridge with a 500 volt power supply unit Is used*--A~te ilshed by General Electrie Company consists of two jOCncentrl plated brass cylinders spaced at 0.1 inch. Proper distance bet ?Cn electrodes Is maintained by a Pyrex glass spacer plate. (Complete de Lptlon of cell is in the test method. Equipment for the dielectric con t measurements is listed in the method No. 14-36-48^- Tfclp aqiment changed desi&x in the last ten years and new models^tove^td be used.- a set-up now the following items are the most re&sod&ble in price for the required measurements. GapacltefcPe Bridge General Radio Company Type 716-C A*3>llflet W Null >ctor, General Radio Company Type 1231-B OsolUatcaeX * ,. '' ^^'/Gciieral Radio Company 1302-A , Air Condons) that can stand up in Aroelcr) at least 500 nmf* A; Description and prices of all General Radio Company equipment are found in their 1948 Catalog X,* We use only tto manufacturer* s data for assembly .and operation* -v-- - ---- - v- If you do not have this catalog, probably Dr. R. H. Mineh at Organic Research can loan you a copy for a quick look. He may even comment on the equipment for you. Accuracy of the electrical measuring equipment is given with the two bridges. For tbs capacitance bridge, tto accuracy is 1 0.2 in tbs DSW 330813 STLCOPCB4077457 n 1 , I Mr. H. 0. Hehner V- 2 - *- P- . \ : f *:T rf?5K^r -/*h ' May 27, 1948 rang of the Aroclor raea surennts. The resistivity bridge has an accu racy of 1 10# In the Aroclor range when used with a cell haying a eon- 7r. ?, UT 2 A OSNN814 STLCOPCB4077458