Return-Path: Received: (qmail 6761 invoked from network); 10 Nov 2004 21:04:40 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore02.plus.net with SMTP; 10 Nov 2004 21:04:40 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1CRzuB-000CUP-KB for dave@picks.force9.co.uk; Wed, 10 Nov 2004 21:21:27 +0000 Received: from [192.168.67.1] (helo=ptb-mxcore01.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CRzuB-000CU7-7W for dave@picks.force9.co.uk; Wed, 10 Nov 2004 21:21:27 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim 4.30; FreeBSD) id 1CRzdv-000Ard-Jq for dave@picks.force9.co.uk; Wed, 10 Nov 2004 21:04:39 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1CRzdK-00083G-WE for rs_out_1@blacksheep.org; Wed, 10 Nov 2004 21:04:02 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CRzdK-000837-K7 for rsgb_lf_group@blacksheep.org; Wed, 10 Nov 2004 21:04:02 +0000 Received: from mail3.bulldogdsl.com ([212.158.192.11] helo=smtp.bulldogdsl.com) by relay.thorcom.net with esmtp (Exim 4.41) id 1CRzdF-0000Hi-D0 for rsgb_lf_group@blacksheep.org; Wed, 10 Nov 2004 21:04:02 +0000 Received: from AUG2004 (host-84-9-76-252.bulldogdsl.com [84.9.76.252]) by smtp.bulldogdsl.com (Postfix) with ESMTP id 3BBB31091D for ; Wed, 10 Nov 2004 21:03:50 +0000 (GMT) Message-ID: <000a01c4c768$c69f9590$2101a8c0@AUG2004> From: "Walter Blanchard" To: rsgb_lf_group@blacksheep.org References: <000f01c4c75e$a00d5ca0$bbab7ad5@jgtdiynm> Date: Wed, 10 Nov 2004 21:03:43 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-SPF-Result: relay.thorcom.net: 212.158.192.11 is neither permitted nor denied by domain of pncl.co.uk X-Spam-Score: 0.8 (/) X-Spam-Report: autolearn=no,HTML_30_40=0.809,HTML_MESSAGE=0.001 Subject: LF: Wood formers Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit

The coilhouse for the Decca coils used wooden platforms and the spec was mahogany, kiln-dried for (I think) a month, then coated with water-repellent gunge. One day a new set were put in and when the power was switched on two transverse legs literally exploded. Turned out the contractor had cut a few corners and not dried them properly. Thereafter, thermometers (alcohol) were inserted into the legs before switching-on and if the temperature rose above 60 degs C after switch-on power was reduced until temp stayed stable, then gradually increased as the wood dried out properly. Once dry, it stayed dry because the RF chased out any moisture.

The coil formers were always Delmoldin compound (too heavy and expensive to use for everything!)

Walter G3JKV.