Keywords: bookid:laboratoryexerc00alle bookidlaboratoryexerc00alle bookyear:1892 bookyear1892 bookdecade:1890 bookdecade1890 bookcentury:1800 bookcentury1800 bookauthor:allen__charles_ricketson__1862___from_old_catalog_ bookauthorallencharlesricketson1862fromoldcatalog booksubject:physics booksubjectphysics bookpublisher:new_york__h__holt_and_company bookpublishernewyorkhholtandcompany bookcontributor:the_library_of_congress bookcontributorthelibraryofcongress booksponsor:the_library_of_congress booksponsorthelibraryofcongress bookleafnumber:75 bookleafnumber75 bookcollection:library_of_congress bookcollectionlibraryofcongress bookcollection:americana bookcollectionamericana monochrome drawing indoor curve bookid:laboratoryexerc00alle bookidlaboratoryexerc00alle bookyear:1892 bookyear1892 bookdecade:1890 bookdecade1890 bookcentury:1800 bookcentury1800 bookauthor:allen__charles_ricketson__1862___from_old_catalog_ bookauthorallencharlesricketson1862fromoldcatalog booksubject:physics booksubjectphysics bookpublisher:new_york__h__holt_and_company bookpublishernewyorkhholtandcompany bookcontributor:the_library_of_congress bookcontributorthelibraryofcongress booksponsor:the_library_of_congress booksponsorthelibraryofcongress bookleafnumber:75 bookleafnumber75 bookcollection:library_of_congress bookcollectionlibraryofcongress bookcollection:americana bookcollectionamericana monochrome drawing indoor curve Identifier: laboratoryexerc00alle Title: Laboratory exercises in elementary physics Year: 1892 (1890s) Authors: Allen, Charles Ricketson, 1862- [from old catalog] Subjects: Physics Publisher: New York, H. Holt and company Contributing Library: The Library of Congress Digitizing Sponsor: The Library of Congress View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: Suppose, again, the diameter of a sphere is needed.Obtain two rectangular blocks, aa in Fig. 42, and placethe sphere between them, the whole resting on a levelsurface. Bring the blocks up against the sphere with theirfaces parallel. Then the distance between the blocks is thediameter of the sphere. Measure from edge to edge di- .-1.1 ill lilil « h Ii1.li 11 -I ■ I ■ hi ill li .1.1,1.1. B AC D / rectly over the centre of the sphere. The ball should beturned and the work repeated a few times. Both blocksshould be set against a smooth vertical surface. In allthese cases the same precaution is necessary,—to have theline of sight at right angles to the surface on which thescale is marked. 62 MENSURATION. Text Appearing After Image: When the scale cannot be brought up to the body, specialmethods are resorted to. One is called The CompassMethod. A pair of compasses or dividers are adjusteduntil the distance betweentheir points is just that tobe measured. The compassesare then applied to the scale,with one point on a num-bered line, and the positionFlG-42- of the other point is read. Sometimes a pointer is to be read against a scale, as ingetting the Coefficient of Expansion. Always have thepointer as near the scale as possible, but not touching it,and arranged so that in moving it along the scale it is thesame distance from it. Always read from the same side ofthe pointer. Best of all, end the pointer with a fine needle,and have the point of the needle read on the scale. Amagnifying-glass is often of assistance. EXERCISE 1. PRACTICE IN THE USE OF LINEAR SCALES.EXPERIMENT. Apparatus.— A sheet of paper on which two crosses have beenruled with a sharp pencil, 30 or 40 cm. apart; a meter-stick withEnglish scale on o Note About Images 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 work. Identifier: laboratoryexerc00alle Title: Laboratory exercises in elementary physics Year: 1892 (1890s) Authors: Allen, Charles Ricketson, 1862- [from old catalog] Subjects: Physics Publisher: New York, H. Holt and company Contributing Library: The Library of Congress Digitizing Sponsor: The Library of Congress View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: Suppose, again, the diameter of a sphere is needed.Obtain two rectangular blocks, aa in Fig. 42, and placethe sphere between them, the whole resting on a levelsurface. Bring the blocks up against the sphere with theirfaces parallel. Then the distance between the blocks is thediameter of the sphere. Measure from edge to edge di- .-1.1 ill lilil « h Ii1.li 11 -I ■ I ■ hi ill li .1.1,1.1. B AC D / rectly over the centre of the sphere. The ball should beturned and the work repeated a few times. Both blocksshould be set against a smooth vertical surface. In allthese cases the same precaution is necessary,—to have theline of sight at right angles to the surface on which thescale is marked. 62 MENSURATION. Text Appearing After Image: When the scale cannot be brought up to the body, specialmethods are resorted to. One is called The CompassMethod. A pair of compasses or dividers are adjusteduntil the distance betweentheir points is just that tobe measured. The compassesare then applied to the scale,with one point on a num-bered line, and the positionFlG-42- of the other point is read. Sometimes a pointer is to be read against a scale, as ingetting the Coefficient of Expansion. Always have thepointer as near the scale as possible, but not touching it,and arranged so that in moving it along the scale it is thesame distance from it. Always read from the same side ofthe pointer. Best of all, end the pointer with a fine needle,and have the point of the needle read on the scale. Amagnifying-glass is often of assistance. EXERCISE 1. PRACTICE IN THE USE OF LINEAR SCALES.EXPERIMENT. Apparatus.— A sheet of paper on which two crosses have beenruled with a sharp pencil, 30 or 40 cm. apart; a meter-stick withEnglish scale on o Note About Images 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 work. Identifier: laboratoryexerc00alle Title: Laboratory exercises in elementary physics Year: 1892 (1890s) Authors: Allen, Charles Ricketson, 1862- [from old catalog] Subjects: Physics Publisher: New York, H. Holt and company Contributing Library: The Library of Congress Digitizing Sponsor: The Library of Congress View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: Suppose, again, the diameter of a sphere is needed.Obtain two rectangular blocks, aa in Fig. 42, and placethe sphere between them, the whole resting on a levelsurface. Bring the blocks up against the sphere with theirfaces parallel. Then the distance between the blocks is thediameter of the sphere. Measure from edge to edge di- .-1.1 ill lilil « h Ii1.li 11 -I ■ I ■ hi ill li .1.1,1.1. B AC D / rectly over the centre of the sphere. The ball should beturned and the work repeated a few times. Both blocksshould be set against a smooth vertical surface. In allthese cases the same precaution is necessary,—to have theline of sight at right angles to the surface on which thescale is marked. 62 MENSURATION. Text Appearing After Image: When the scale cannot be brought up to the body, specialmethods are resorted to. One is called The CompassMethod. A pair of compasses or dividers are adjusteduntil the distance betweentheir points is just that tobe measured. The compassesare then applied to the scale,with one point on a num-bered line, and the positionFlG-42- of the other point is read. Sometimes a pointer is to be read against a scale, as ingetting the Coefficient of Expansion. Always have thepointer as near the scale as possible, but not touching it,and arranged so that in moving it along the scale it is thesame distance from it. Always read from the same side ofthe pointer. Best of all, end the pointer with a fine needle,and have the point of the needle read on the scale. Amagnifying-glass is often of assistance. EXERCISE 1. PRACTICE IN THE USE OF LINEAR SCALES.EXPERIMENT. Apparatus.— A sheet of paper on which two crosses have beenruled with a sharp pencil, 30 or 40 cm. apart; a meter-stick withEnglish scale on o Note About Images 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 work. Identifier: laboratoryexerc00alle Title: Laboratory exercises in elementary physics Year: 1892 (1890s) Authors: Allen, Charles Ricketson, 1862- [from old catalog] Subjects: Physics Publisher: New York, H. Holt and company Contributing Library: The Library of Congress Digitizing Sponsor: The Library of Congress View Book Page: Book Viewer About This Book: Catalog Entry View All Images: All Images From Book Click here to view book online to see this illustration in context in a browseable online version of this book. Text Appearing Before Image: Suppose, again, the diameter of a sphere is needed.Obtain two rectangular blocks, aa in Fig. 42, and placethe sphere between them, the whole resting on a levelsurface. Bring the blocks up against the sphere with theirfaces parallel. Then the distance between the blocks is thediameter of the sphere. Measure from edge to edge di- .-1.1 ill lilil « h Ii1.li 11 -I ■ I ■ hi ill li .1.1,1.1. B AC D / rectly over the centre of the sphere. The ball should beturned and the work repeated a few times. Both blocksshould be set against a smooth vertical surface. In allthese cases the same precaution is necessary,—to have theline of sight at right angles to the surface on which thescale is marked. 62 MENSURATION. Text Appearing After Image: When the scale cannot be brought up to the body, specialmethods are resorted to. One is called The CompassMethod. A pair of compasses or dividers are adjusteduntil the distance betweentheir points is just that tobe measured. The compassesare then applied to the scale,with one point on a num-bered line, and the positionFlG-42- of the other point is read. Sometimes a pointer is to be read against a scale, as ingetting the Coefficient of Expansion. Always have thepointer as near the scale as possible, but not touching it,and arranged so that in moving it along the scale it is thesame distance from it. Always read from the same side ofthe pointer. Best of all, end the pointer with a fine needle,and have the point of the needle read on the scale. Amagnifying-glass is often of assistance. EXERCISE 1. PRACTICE IN THE USE OF LINEAR SCALES.EXPERIMENT. Apparatus.— A sheet of paper on which two crosses have beenruled with a sharp pencil, 30 or 40 cm. apart; a meter-stick withEnglish scale on o Note About Images 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 work. |