The Watchmakers' Hand-bookJ. Tripplin, 1881 - 482 σελίδες |
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acid alloy applied arbor axis balance balance-spring barrel brass broach cement centre chamfering chuck circumference clamped clean colour conical copper cutter cutting edge cylinder depth described in article dial diameter disc drill emery employed equal escape-wheel face ferrule finger fixed flat glass graver groove hammer hand hard hardening heat hole indicated iron lathe lever escapement mandril manner metal method millimetre Modern Horology motion necessary nitric acid notch object obtained oilstone operation ordinary pass pegwood perforated piece pinion pivot plate VIII polished poppet-head portion position powder pulley ratchet red heat removed right angles rotate rottenstone rouge round runner screw screw-plate shellac shown in fig side slide slide-rest smooth solder spindle spring square steel stone sufficient sulphuric acid surface T-rest teeth thickness tool Treatise on Modern turns watch watchmaker wheel wheel-cutting engine workman zinc
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Σελίδα 4 - Find the greatest square in the first period on the left, and place its root on the right after the manner of a quotient in division. Subtract the square of the root from the first period, and to the remainder bring down the second period for a dividend.
Σελίδα 4 - To find the square root, divide the number into periods of two digits each, by placing dot over every second figure beginning with that in the units place and proceeding towards the left. Find the greatest number whose square is contained in the first period. This will be the first figure of the required square root, subtract its square from the first period, and to the remainder bring down the next period. (eg) Find the square root of 980100 99 9 ' 189 98,01,00 81 1701 1701 0 .'. Square root = 990.
Σελίδα 325 - ... afterwards carefully cleaned. The French chalk and hartshorn are more effective according as they have remained a longer time in the alcohol ; doubtless owing to the fact that the hard grains are then more completely dissolved. In soaping, it is advisable to use a soap that quickly produces a good lather. The object is held in the hand and cleaned by rubbing with a soft brush charged with this lather ; then immerse first in clean water, and subsequently in alcohol, moving it about in each : it...
Σελίδα 4 - ... to the root and also to the divisor. Then multiply the divisor, as it now stands, by the part of the root last obtained, and subtract the product from the number formed, as above mentioned, by the first remainder and second period.
Σελίδα 4 - Multiply the divisor as it now stands by the part of the root last obtained, and subtract the product from the dividend. If there are more periods to be brought down, continue the operation in the same manner as before.
Σελίδα 329 - ... suitable in other places, on account of its tendency to spread, and leave the rubbing surfaces. If too much oil is applied, the effect is the same as if there had been too little ; it runs away, and only a minute quantity is left where it is wanted. To apply oil to the coils of the spring is not enough ; some must also be placed on the bottom of the barrel. Before putting on the cover, moisten the shoulder of the arbor-nut that comes in contact with it with oil : by doing so, when oil is applied...
Σελίδα 330 - ... to reduce its friction against the cap, must not be in such quantity as to spread on to the winding square. It is a good plan to round off the lower corner of this cover. The observation made in reference to the oil applied to the barrel cover may be repeated for the centre wheel. After the drop of oil is introduced into the oil-cup of the balance pivothole, insert a very fine pegwood point, so as to cause the descent of the oil ; a small additional quantity may then be applied. When this precaution...
Σελίδα 315 - ... the frame ; that the wheels are free of each other, and of the frame or any part connected with it ; that the chain is free of the pillar and the stop-stud ; that the dial feet are not in the way ; and that the dial, or brass-edge, as the case may be, fits properly against the pillar plate. By laying the nail on the surface of the glass, it will be easy to see whether there is sufficient freedom between the socket of the hand and the glass. In case of doubt, place a small piece of paper on the...
Σελίδα 6 - In every proportion the product of the extremes is equal to the product of the means. Thus, in the proportion 374:.
Σελίδα 127 - ... is displaced, the cement cannot adhere to the surface to which it is applied, simply because it cannot come into contact with it. The most efficient agent in displacing this adhering air 'is heat.