Clockmakers Repair
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 VINTAGE R CARR DESK CLOCK HALLMARKED STERLING SILVER BORDER  US $28.00
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 E INGRAHAM ANTIQUE MANTLE CLOCK ALL ORIGINAL LOOKS AND RUNS GREAT 1909 US $99.75
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 LARGE ANTIQUE SCOTTISH LONGCASE GRANDFATHER CLOCK JOHN MCRAE INVERNESS 1837 US $8,099.00
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 Jefferson Golden Hour Mystery Clock How to Repair CD Book US $5.99
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 ANTIQUE ENGLISH MOONROLLER LONGCASE GRANDFATHER CLOCK US $8,270.00
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 SCHATZ JAHRESUHRENFABRIK 400 DAY GERMAN ANNIVERSARY CLOCK 100 YEARS OLD US $336.60
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 cuckoo clock repair DVD US $34.50
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 Clock and Watch Repairing by Donald de Carle US $24.50
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 Hermle Clock Replacement Cable 73 One Flared end US $7.50
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 Clockmakers Watchmakers of Scotland US $77.50
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 Black Forest 1 Day Carved Cuckoo Clock 134 US $473.00
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 Hermle Cable Grandfather Clock Ratchet wheel US $6.50
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 Urgos Hermle Clock Replacement Cable 106 Small ends US $7.50
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 ANTIQUE ENGLISH LONGCASE GRANDFATHER CLOCK 4 SEASONS SPANIEL W JACKSON LIVERPOOL US $7,710.00
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 Getting Started in Clock Repair How to CD Book US $5.99
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 The Modern Clock {1905 Vintage Repair Manual} on CD US $5.99
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 Cable Grandfather Clock Pulley Parts Hermle Urgos US $7.50
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 Oiling the Watch How to CD Book US $6.99
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 Antique clockmakers test timing repair clock movement stand cast iron US $149.00
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 ANTIQUE 1798 ALEXANDER MILLER SCOTLAND GRANDFATHER LONG CASE CLOCK DATE CALENDAR US $11,999.99
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 How To Repair Clocks Watches {54 Vintage Horology Books Manuals Journals} on DVD US $12.95
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 Year Anniversary 400 Day Clock Repair How to CD Book US $6.99
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 Compensating Pendulum How to CD Book US $4.99
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 How to Make Money On eBay with Clocks Watches How to CD Book US $2.99
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 Clock Test Stand Cast Iron US $59.99
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 DIAL CASE ART WALL CLOCK VINTAGE COPPER PAINTED NEW US $66.36
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 Understanding The American Count Wheel System CD Book US $3.99
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 Rack Snail Count System Completely Explained CD Book US $3.99
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 3 HOROLOGICAL TIMES 1976 1980 Westminster chime Wittnauer Polara Escapements US $10.00
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 Westclox Alarm Clock Repair Service With 2 Year Warranty US $89.00
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 Brass Alarm Clock Bells Clockmakers Gong Repair Part 5 US $69.99
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 2 Clock Pendulum Holder Clockmakers Repair Parts 14 US $23.99
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 150 Clock Click Rivets Clockmakers Brass Repair Parts US $25.50
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 27 Clock Rivets Levers Wire Clicks Clockmakers Parts US $29.99
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 4 Grandfather Clock Gongs Wire Base Clockmakers Parts US $19.99
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 NEW OLD STOCK SETH THOMAS TRADEMARK CLOCK KEY FOR THE WESTMINSTER 124 MOVEMENT US $16.99
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 NEW OAK LEAF WOOD CUCKOO CLOCK PENDULUM cookoo coo coo kookoo repair parts US $11.99
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 NEW WOOD CHALET CUCKOO CLOCK PENDULUM cookoo repair parts coo coo movement US $9.99
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Swing with Me
Copyright (c) 2009 Mike Bond
You remember the escapement. The way the power of the clock's released in equal time through the use of things called pallets dipping in and out of a saw toothed wheel?
The clockmaker/repairer will work mainly on three types of escapement. The Verge, Recoil Anchor and Deadbeat. There are others, of course.
The grasshopper, the double three-legged gravity escapement, (used originally in Big Ben, invented by Edmund Dension, later Lord Grimthorpe) and used now in many tower clocks. But for the purposes of this article we'll stick to those escapements first mentioned.
The escape wheel of the Verge escapement is made as a crown, or contrate wheel. The teeth are cut at 90 degrees to the face. An arbor runs over the wheel, on which are set the pallets. One on one side of the wheel, the other 180 degrees to it.
The pendulums on these clocks are very light, and once the clock's underway, the pendulum is made to swing in a huge arc, anything up to 100 degrees. The great Dutch scientist and clockmaker, Christiaan Huygens, realized that such an excessive movement of the pendulum would fail to make the clock's escapement isochronous. There's that awful word again!
The swing was so great, that variations due to power differentials as the mainspring unwound were inevitable.
Following the Verge came the Recoil Anchor escapement. Robert Hooke said that Robert Hooke invented it! This was challenged strongly by a gentleman named William Clement, who did in fact make the first longcase, or grandfather clock. Whoever invented it, there's no dispute that the first clock to use the Anchor escapement was made by Joseph Knibb in about 1670, for Wadham College, Oxford.
Up until then, there was really little point in having minute hands, such could be the time variations, hour to hour. Timekeeping improved very dramatically because of this new device. Because of this, the minute hand was added to clocks.
There are two basic reasons for this. Firstly, the arc, or swing, of the pendulum was lessened dramatically from the huge 80 - 100 degrees of the old Verge, down to 4 - 6 degrees. Another great benefit was that instead of the lightweight pendulum of the Verge, a much heavier one could be used. One of the most vital aspects of timekeeping is that the pendulum controls the clock and not the other way round. But then they went one step further.
Not only was a minute hand included, but by extending the arbor upon which the escape wheel was set so that it came right through the front plate of the clock, a seconds hand also could be added. Now, while this did show the seconds, provided the gearing was correct and allowed the escape wheel to revolve once a minute, or even twice a minute, when the clock would beat half-seconds, it wasn't totally satisfactory.
Have you ever looked at a clock with a seconds hand and noticed that as this little hand goes around, it recoils slightly? The geometry of this particular escapement causes the escape wheel to reverse very slightly with each swing of the pendulum? Hence the correct name for this type of escapement. The Recoil Anchor. But improvements were even then on the way.
In about 1675, a Mr. Richard Towneley invented the Deadbeat escapement. The great English clockmaker, George Graham, is often, and erroneously, credited with this, but in fact he was the first one to actually develop and use the system.
The main difference between the two types is that with the Anchor, as the pallets dip in and out of the escape wheel teeth, they give impulse as their sides run down the teeth faces.
The difference between the Anchor and the Deadbeat is that there's no recoil on the latter. The pallets pass into the wheel, receive their impulse from the tips of the pallets and not the side faces.
There's still supplementary arc, though - but that's for next time
About the Author
Up until then, there was really little point in having minute hands, such could be the time variations, hour to hour. Now, though, minute hands were a necessity because of the vastly more accurate timekeeping given by this new device.
http://www.theclockssite.com
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