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Do You Know?


From The American Horologist magazine, October 1938

Do You Know?
Directed by 
W. H. Samelius, Chairman
Science of Horology and Technical Board

 Table showing the thickness of washers and about how many seconds they will slow up a watch having 14 weight screws in the balance and otherwise like an average 18 or 16 size balance:


.O2 mm. 30 seconds in 24 hours, 
.04 mm. 60 seconds in 24 hours, 
.07 mm. 120 seconds in 24 hours. 
.09 mm. 180 seconds in 24 hours, 
.12 mm. 300 seconds in 24 hours, 
.18 mm. 480 seconds in 24 hours.


If washers are made for 0 size watches or smaller, the above rule will not apply as the effect of washers will be about 3 to 4 times greater.


During the years when the music box was in favor, the musical m'lchinery was reduced so small that there were musical snuff boxes, musical seals, musical watches and even musical rings.


The first equation clock to show both mean and apparent time was made in Lcndon about 200 years ago.


We often find hard steel pallets badly pitted or grooved, both on the locking face and impulse face. 


When the brass tooth of the escape wheel drops on the locking face of the pallet the impact will cause any abrasive material that may have settled on the face of the pallet to become embedded in the soft brass tooth and in this way the tooth becomes charged and as the tooth then passes over the hard steel pallet, a groove or pit mark will be the natural result.


When refinishing a worn pallet, be very careful to maintain original lifting and locking angles.


There are two centers to a lathe; the center that fits in the headstock is called the live center and the one the fits into the tail stock is called the dead-center.


The light rays from an arc light travel 186,000 miles per second.


There are over 1,000 separate and distinct inspections thruout the making of a complete watch and in all there are over 200 separate pieces in a watch movement.


The first planatary machine made in England was built by the celebrated clockmaker, George Graham.


With a contour projector as used in our modern watch factories, a small watch plate is enlarged on a screen 150 times in order to detect any error as to locations for pivot holes, screw holes, etc.
The thickness of a baguette hairspring is 64/100,000 inch and the width is 4/1000 inch.


The standard of accuracy in one of our largest watch factories is three-one hundred thousands inch.


During the early days of clockmaking the seconds-beat pendulum was known as, or called a "Royal Pendulum." 


Many fresh water pearls are found in the waters of the United States such as the Mississippi and its tributaries There are also many fine pearls found in Scotland.


All salt water pearls are given the trade name "Oriental." They are found in the Persian gulf, South Sea Islands, Venezuela, Panama, Australia and Japan. 

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