Document ZnLgDx2yOgXBoKNq20xNb2LN8

cable AODnefts. GENRADCO. BOSTON telephone TROWBRIDGE 4400 RADIO COMPANY ELECTRICAL LABORATORY FOUNDED 1915. APPARATUS 275 MASSACHUSETTS AVENUE CAMBRIDGE 39, MASSACHUSETTS June 6, 1947 Monsanto Chemical Company Anniston Alabama Attention of Mr. F. A. Barker. Chief it Dear Mr. Earker: Thank yon for your letter of May 30 relative to your Type 544-B Megohm Bridge. Our records indicate that you are using this instrument with the Type 544-P2 90 volt Power Supply. To make the change in this instrument to a 500-volt Power Supply it will be necessary only to pur chase the Type 544-P3 Power Supply as described in the enclosed catalog pages. This new power supply is used in place of your present one. Our formal quotation summarizing price and delivery information is enclosed for your convenience. We are sorry that we will not ha^e additional 500-volt Power Supplys until early November. Very truly yours. Enclosure MTS:VLP WMljyVvoon T. !Smith Sales Engineering Manager & -xji nP STLCOPCB4077492