. The Canadian field-naturalist. Natural history. EGGSHELL BALL BEARING SOLDER BRASS CAP Figure 2. Detail of accessory device which converts micrometer from parallel anvil type to tangent sphere type so that the thickness of curved objects can be measured. able: Mercer Ltd., Eywood Rd., St. Albans, Hert- fordshire, England: or Allied Tools Ltd., 7219-104 Street, Edmonton, Alberta) was used. This mico- meter is constructed with a spring loaded upper anvil which moves towards the fixed lower one and in addition has a movable dial face. To this micrometer a simple device was added which was const
. The Canadian field-naturalist. Natural history. EGGSHELL BALL BEARING SOLDER BRASS CAP Figure 2. Detail of accessory device which converts micrometer from parallel anvil type to tangent sphere type so that the thickness of curved objects can be measured. able: Mercer Ltd., Eywood Rd., St. Albans, Hert- fordshire, England: or Allied Tools Ltd., 7219-104 Street, Edmonton, Alberta) was used. This mico- meter is constructed with a spring loaded upper anvil which moves towards the fixed lower one and in addition has a movable dial face. To this micrometer a simple device was added which was constructed of a ball bearing of approximately 6 mm. diameter which was soldered to a brass cap hollowed to fit on the lower anvil (Fig. 2). When this device was in place the dial was rest to zero and eggshells were easily measured to the nearest mm. Victor Lewin Figure 1. Dial thickness micrometer with accessory device in place on lower anvil. Department of Zoology University of Alberta Edmonton, Alberta Received September 1. Accepted September 8, 1970 1970 305. 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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