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Improved Electropoion Fluid
Add one part (by volume) of sulphuric acid to 10 parts of water. Of 10 pounds (or pints) of the dilute acid, add from 1 to 2 pounds of…
Imitation of Antique Silver
The article is dipped in a bath of water containing about 10 per cent of sulphide of ammonium, and then scratch brushed with a brush made…
Ice Box
A box or chamber used when adjusting chronometers and fine watches for temperature. It is usually built in the form of a double box, the…
Idler
1, An idle wheel. 2, A wheel for transmitting motion from one wheel to another, either by contact or by means of belts, as the wheel on a…
Impulse Pin
The ruby pin of the lever escapement which, entering the notch of the lever, unlocks the escape wheel and then receives impulse from the…
Index
The small curved plate with divisions on its face, over which the regulator arm passes. The circular plate at the back of a lathe head…
Ingold Fraise
A pinion shaped cutter used for correcting inaccuracies in the shape of wheel teeth, invented by Ingold, a Swiss watchmaker. This consists…
Involute
The curve traced by the end of a string wound upon a roller or unwound from it. This was a favorite shape for wheel teeth at one time, but…
Isochronal
Uniform in time; moving in equal time. When the long and short arcs of a balance are caused to be performed in the same time by means of a…
In Fig (We show the unlocking pins u)
221 we show the unlocking pins u beginning their action on the line of centers--the best possible point--in unlocking the escapement. These…
Inches (French Lines French Lines)
French Lines. 1 0.0393708 0.44329 2 0.0787416 0.88659 3 0.1181124 1.32989 4 0.1574832 1.77318 5 0.1968539 2.21648 6 0.2362247 2.65978 7…
Inches (Millimeters A meter)
Millimeters. 1 0.088414 2.25583 2 0.177628 4.51166 3 0.266441 6.76749 4 0.355255 9.02332 5 0.444069 11.27915 6 0.532883 13.53497 7 0.621697…
Importance of Fixing
Whatever kind of pendulum is used, it will not keep time unless it is rigidly fixed. Just as engineer clockmakers invariably make their…
In Fig (I have developed curve)
314, I have developed curve 1, as a true epicycloidal curve, which practically explains itself. I have then taken circles approximating the…
Independent Seconds & Inertia
A movement having a seconds hand that is driven by a separate train. That property of matter by which it tends when in rest to remain so…