Search Results for: Photographic laboratory apparatus
material, to prevent noise,) which does not permit the arm or instrument bending but in one direction. the arm or instrument (b) acts on the hammer, either by a pin joint, as shown at (b ) fig. , or by means such as are shown at figure , or otherwise. figure shows the instrument (b) combined with other apparatus
for relieving and checking the hammer, by which arrangement or combination of parts greater power, quicker repetition and certainty of the blow, with a check quick and efficient, are obtained. figures , , and show a modification of the combination wherein the check and relieving apparatus are somewhat...
https://www.piano-tuners.org/history/hopkinson/index.html
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