The spherometer is accepted as the sole guide in obtaining the proper curvature. From Wordnik.com. [On Laboratory Arts] Reference
The spherometer is accepted at all stages of the process as the final arbiter as to curvature. From Wordnik.com. [On Laboratory Arts] Reference
It is well to control this process by means of a spherometer, so that the desired radius may be approximately reached. From Wordnik.com. [On Laboratory Arts] Reference
Before the grade of emery is changed all three surfaces must agree, as nearly, at least, as the spherometer will show. From Wordnik.com. [On Laboratory Arts] Reference
Here is a very fine spherometer that Dr. Hastings works with from time to time, and which he calls his standard spherometer. From Wordnik.com. [Scientific American Supplement, No. 484, April 11, 1885] Reference
The squares of glass are cemented to the roughing tool, and this is ground to the spherometer by means of the counterpart tool. From Wordnik.com. [On Laboratory Arts] Reference
After a little practice it will be found possible to bring the glass exactly up to the required curvature as tested by template or spherometer. From Wordnik.com. [On Laboratory Arts] Reference
The rough grinding is checked by the spherometer, and is interrupted when that instrument gives accordant and correct measurements all over the surface. From Wordnik.com. [On Laboratory Arts] Reference
The finely ground surface must, of course, be apparently correct in so far as a spherometer (with 3 inches between the legs for a disc 1 foot in diameter) will show. From Wordnik.com. [On Laboratory Arts] Reference
Many devices have been added to the spherometer to make it as sensitive as possible, such as the contact level, the electric contact, and the compound lever contact. From Wordnik.com. [Scientific American Supplement, No. 484, April 11, 1885] Reference
The two glass-grinding tools are then ground together by hand (see § 53 and § 61), the spherometer being employed from time to time to check the progress of the work. From Wordnik.com. [On Laboratory Arts] Reference
A check by spherometer will be applied at intervals according to the judgment of the operator, but, in any case, the fellow tool and lens should be kept at very nearly the same figure. From Wordnik.com. [On Laboratory Arts] Reference
The process of fine grinding is continually checked by the spherometer, and the art consists in knowing how to move the grinding tool so as to make the lens surface more or less curved. From Wordnik.com. [On Laboratory Arts] Reference
A convex and concave glass surface having been thus roughly prepared, they must be mounted in turn in the lathe, and brought to the proper curvature by grinding with the tools formerly employed and tested by the template or spherometer. From Wordnik.com. [On Laboratory Arts] Reference
Two auxiliary tools of, say, half the diameter of the lens, are prepared from slate, or glass backed with iron, and applied to grind down either the central part of the lens surface or tool surface, according to the indications of the spherometer. From Wordnik.com. [On Laboratory Arts] Reference
The curvature is tested from time to time by a spherometer, and the tool is increased or decreased in curvature by turning it on a lathe so as to cause it to grind the glass more at the edges or in the middle according to the indications of the spherometer. From Wordnik.com. [On Laboratory Arts] Reference
By the exercise of patience and perseverance any one will succeed in gradually fine grinding the lens surface and keeping it to the spherometer, but the skill comes in doing this rapidly by varying the shape of the strokes before any appreciable alteration of curvature has come about. From Wordnik.com. [On Laboratory Arts] Reference
Science in Philadelphia, there was quite a discussion as to the relative merits of the spherometer test and another form which I shall presently mention, Prof. Harkness claiming that he could, by the use of the spherometer, detect errors bordering closely on one five-hundred-thousandth of an inch. From Wordnik.com. [Scientific American Supplement, No. 484, April 11, 1885] Reference
I may add that if this spherometer is placed on a plate of glass and exact contact obtained, and then removed, and the hand held over the plate without touching it, the difference in the temperature of the glass and that of the hand would be sufficient to distort the surface enough to be readily recognized by the spherometer when replaced. From Wordnik.com. [Scientific American Supplement, No. 484, April 11, 1885] Reference
The curvature is checked by the spherometer. From Wordnik.com. [On Laboratory Arts] Reference
(3) The glass is ground with emery to the correct spherical figure as given by a spherometer. From Wordnik.com. [On Laboratory Arts] Reference
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