. The Canadian field-naturalist. Natural history. Notes A Simple Device for Measuring Eggshell Thickness Abstract. A direct reading dial thickness micro- meter with parallel anvils was modified by the addition of a device consisting of a ball bearing mounted on a brass cap which was then fitted over the lower anvil thus enabling the thickness of a curved object to be measured to the nearest mm. While conducting research on the effects of pesti- cide residues on eggshell structure it was apparent that conventional calipers were unsuitable for making thickness measurements. These instru- me
. The Canadian field-naturalist. Natural history. Notes A Simple Device for Measuring Eggshell Thickness Abstract. A direct reading dial thickness micro- meter with parallel anvils was modified by the addition of a device consisting of a ball bearing mounted on a brass cap which was then fitted over the lower anvil thus enabling the thickness of a curved object to be measured to the nearest mm. While conducting research on the effects of pesti- cide residues on eggshell structure it was apparent that conventional calipers were unsuitable for making thickness measurements. These instru- ments either have parallel jaws, which can not be used to determine the thickness of a curved plane, o! points which were found to be widely inaccurate due to either poor alignment or point which varied according to the pressure applied. To overcome these difficulties a direct reading dial thickness micrometer as seen in Fig. 1 (avail-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
