Amateur mechanics ... a book for old and young who like to make things .. (1907)
Popular mechanics magazine, Chicago. [from old catalog] · Chicago, Popular mechanics · leaf 38
n the shapeof a small ar-row. Balance thearrow on theneedle as shownin the sketch,and the instru-ment will thenbe complete. If a piece of paper is then heated over alamp or stove and rubbed with a piece ofcloth or a small broom, the arrow willturn when the paper is brought near it.—Contributed by… … Simple Telegraph Line When the lower half of a battery zinc be-comes eaten away the remaining part canbe used againby suspendingit from a wireas shown inthe cut. Besure and havea good connec-tion at thezinc binding-post and coversame withmelted paraf-fin. This pre-vents corro-3 i on whichwould…
Handicraft · Amusements
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