. Handbook of birds of eastern North America; with introductory chapters on the study of birds in nature . Onlyone cover, with clasps for the reten-tion of the perforated sheets, will beneeded, and at the end of a trip orseason the sheets may be removed andbound. This is essentially the methodof note-keeping described in the firstedition of the Handbook and which,after seventeen years additional use,I still unreservedly recommend. The Observation Blind.—The ob-servation blind which, during the pastten years, has met the demands ofmany and varied situations, is in briefan umbrella opened within
. Handbook of birds of eastern North America; with introductory chapters on the study of birds in nature . Onlyone cover, with clasps for the reten-tion of the perforated sheets, will beneeded, and at the end of a trip orseason the sheets may be removed andbound. This is essentially the methodof note-keeping described in the firstedition of the Handbook and which,after seventeen years additional use,I still unreservedly recommend. The Observation Blind.—The ob-servation blind which, during the pastten years, has met the demands ofmany and varied situations, is in briefan umbrella opened within a baglong enough to conceal one. It isdescribed in my Camps and Cruisesof an Ornithologist (p. xiii) asfollows: The umbrella employed in mak-ing an observation blind is known tothe trade as a sign umbrella. Itagrees with the normal variety in sizebut differs from it in having a Ilrgc;hole in the center. This permits acurrent of air to pass through the , •. -r. in i ,,. J ,, .^^, n j_ ■ , IiG. 3. Till- uiubnllu !iii(l buna—a matter of the first nnport- rods of the umbrdlu 12 THE OBSERVATION BLIND ance when one spends hours in the little structure on beach or marsh,where it is fully exposed to the sun. The stick of this umbrella is ametal tube without the usual wooden handle. The umbrella is supported by two brass tubes each of the samelength as the umbrella, or thirty-two inches. The larger is shod witha steel point, by the insertion of a small cold chisel or nail-punch,which is brazed in position. The rod can then be readily driven intothe ground. At the upper end a thumb-screw is placed. The smallertube should enter the larger snugly, and should in turn be just largeenough to receive the umbrella-rod which will enter it as far as thespring catch. The height of the umbrella may, therefore, be governedby the play of the smaller tube in the larger, while the thumb-screwwill permit one to maintain any desired adjustment; as one would fixthe height of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbirds, bookyear1912
