Hi, What's a first printing from 1959 worth? I have my father's from that era. Thanks
-------------- Original message -------------- From: DeeDee Blais <[email protected]> > When I started collecting some 30+ years ago there > were very few books on talking machines. I remember > looking through Ira Dueltgen's copy of 'Tinfoil to > Stereo' and being filled with amazement. I could not > wait to own a copy of my own and I remember being > disappointed when I found out that it was out of > print. Sometime during the seventies another edition > was printed and I finally owned my own copy. I now > have an extra copy and if anyone wants to own it, the > price is $20 plus mailing. It is in good condition > but it is not a first edition. Please contact me off > list if interested. Thanks, Jerry Blais > > > > ________________________________________________________________________________ > > ____ > Be a better sports nut! Let your teams follow you > with Yahoo Mobile. Try it now. > http://mobile.yahoo.com/sports;_ylt=At9_qDKvtAbMuh1G1SQtBI7ntAcJ > _______________________________________________ > Phono-L mailing list > http://phono-l.oldcrank.org From [email protected] Sun Nov 18 21:16:02 2007 From: [email protected] (Walt) Date: Sun Nov 18 21:13:33 2007 Subject: [Phono-L] Electrola light bulbs In-Reply-To: <[email protected]> Message-ID: <000e01c82a6b$483354d0$0301a...@daddell> Tungsten lamps were indeed designed as superior replacements for the carbon lamps, but I think a bit of history is important. By the time the Electrolas were being engineered and sold, the process of drawing tungsten into a reliable filament for lighting had, for all practical purposes, been perfected. It is true that the earliest tungsten filaments (probably before 1911 or so) were unreliable with short service life but I don't think that the earliest tungsten filament bulbs would have been used in an Electrola (since that early market probably disappeared around 1913 or so). OKAY - I JUST GOTTA WRITE THIS - I COULDN'T STOP THINKERS ONLY READ PAST THIS POINT The quest for developing tungsten filament technology is a bit interesting (well, to a nerd like me it is) especially since carbon lamps had been perfected by about 1902. In short, a carbon filament only emits about 2 to 3 lumens per watt and the light is very yellow looking. Tungsten, on the other hand, produced upwards of 10 or 12 lumens per watt and had a much broader spectrum (not only yellow). Yes, those turn of the 20th century shakers and movers just had to have the latest and greatest of everything. About the only improvements that have been made since 1910 have to do with improved reliability due to improved manufacturing processes and variations of the light spectrum by using different gases. Ahhhh I can smell the sweet essence of LED technology already!!! Early tungsten filaments were normally made by extruding a thick sludge like mixture of finely ground/pulverized tungsten and a binder through a die. That produced fairly short segments because they were so brittle and it meant that multiple filaments had to be series strung in order to reach a sufficient electrical resistance. This is why the earliest tungsten filaments were exceedingly fragile prior to about 1911 or thereabout. My old white collar employer, Westinghouse Electric Corporation, improved the technology (between about 1904 and 1909 I believe) by producing a longer single continuous filament using a different extrusion process. The fact that Westinghouse was able to produce a single element (as opposed to multiple segments that later had to be joined) resulted in a more durable filament but it still had problems. Around 1910 General Electric "perfected" the tungsten filament by developing a process to press or swage the tungsten and then draw it through a die to produce which produced a denser and more refined wire for use as a filament. GE's process produced a filament that was not [as] brittle, far more ductile, and had much greater tensile strength (i.e. it could not be rattled and broken as easily) than the early ones. It was after this time that that the "light bulb market" started to shift from carbon to tungsten. Carbon filaments apparently stayed in the marketplace after 1910 and until the end of the 1920's partly because Japanese companies manufactured them, and it is my general understanding that, despite GE's perfection of the tungsten filament, carbon lamps tended to hold up better in harsh environments like the railroad and mining industries, just to name a few, subjected them to.) Go to sleep now.... Walt -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jim Nichol Sent: Sunday, November 18, 2007 10:54 PM To: Antique Phonograph List Subject: Re: [Phono-L] Electrola light bulbs I don't understand. Tungsten filaments were invented to outlast carbon filaments. Jim Nichol On Nov 18, 2007, at 10:45 PM, Rich wrote: > If it is a carbon filament they will last for a very long time while > the early tungsten tends to fail with use much sooner. Some of the > old little bulbs have carbon filaments while most are tungsten. _______________________________________________ Phono-L mailing list http://phono-l.oldcrank.org No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.503 / Virus Database: 269.16.0/1136 - Release Date: 11/17/2007 2:55 PM
