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 84
illonly one of the parts on the groundPlace the plate holder in posi-tion and draw the regular slide: -::-stitute one of the slides prepared, andexpose in the usual way. If a small picture is to be made inthe lower left-hand corner of the plate,place the prepared slide with the cor-ner cut, as… … How to Make an Interrupter The Wenult interrupter is an in-strument much used on large coils andis far more efficient than the usualform of vibrators. It can also be usedwith success on small coils as well aslarge. Although it is a costly instru-ment to purchase, it can be made withpractically no…
Handicraft · Amusements
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