Illustrated catalogue and price-list of drawing and tracing papers, sun print papers and equipments, drawing instruments and materials, surveying instruments, accessories, etc. / Kolesch & Company. (1907)
Kolesch & Company · Kolesch & Company · leaf 203
iitS:? 8135 Optical Square, in morocco case... euch, $ 10.00 8136 Optical Square, with adjusting screw, in morocco case .... • H-5° Miners Compass or Dipping Needle. … In the hands of the prospector the Miners Compass or Dipping Needle proves aserviceable guide to the discovery and location of magnetic iron ore. In this instru-ment the magnetic needle is carefully balanced upon a horizontal axis within a grad-uated circle, and in which the needle will be found to…
Drawing instruments · Surveying instruments
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