WWT Shows CLICK TO: Join and Support Internet Horology Club 185™ IHC185™ Forums

• Check Out Our... •
• TWO Book Offer! •
Go
New Topic
Find-Or-Search
Notify
Tools
Reply to Post
  
WALTHAM QT MODELS "Click" to Login or Register 
IHC Member 525
posted
Walthams 77 model numbers started @ 992501 & finished 3189000. At no.1342701 they started to make them "quicktime" & this continued right up until the last "77" was made ( according to my Ehrhardt Walthambook )Can any member explain what qt means and are there any advantages to it.
 
Posts: 106 | Location: North Yorkshire, United Kingdom | Registered: May 05, 2005
IHC Member 1555
posted
The term of "quicktime" Derek would be referring to "Frequency" (Hertz or Hz) or "Beats Per Hour" (Bph), also terms such as "Slow Train" & "Fast Train" were also used, these are not to be confused with "Coarse" and "Fine" trains. The earlier Model 77 Waltham's were 16,200 BPH or 2.25 Hz, when the change was made they then were 18,000 BPH or 2.5 Hz.

The reason behind "increased Frequency/Bph" ("equals more stored energy", so less prone to disturbances) is for improved accuracy (the faster or higher frequency, then the less escapement error) across and during all types of conditions the watch might encounter.
 
Posts: 2260 | Location: Gladstone in Australia | Registered: January 14, 2011
IHC Member 525
posted
Thanks Bila. When you look @ a running watch & the balance is just a blur there`s a good chance the watch is in fine condition & probably accurate. ( just my opinion )
Was the length of the pallet used to vary the bph ?
 
Posts: 106 | Location: North Yorkshire, United Kingdom | Registered: May 05, 2005
IHC Member 1555
posted
Helps to have them in hand though Derek as you probably are already aware, as photos tend to be miss leading. Pallet length has no bearing on the frequency rates.
 
Posts: 2260 | Location: Gladstone in Australia | Registered: January 14, 2011
  Powered by Social Strata  
 


©2002-2023 Internet Horology Club 185™ - Lindell V. Riddle President - All Rights Reserved Worldwide

Internet Horology Club 185™ is the "Family-Friendly" place for Watch and Clock Collectors