By Albert G. Ingalls

Definitive e-book on novice telescope making. comprises plans and thought on various kinds. matters lined: Newtonian Telescope replicate Making; Optical checking out; Workshop knowledge; and Observatory structures.

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C) High-form beam balances. The balance on the left has a dial mechanism that replaces the lower-mass beams. (d) A digital electronic balance. ) B. The Vernier Caliper In 1631, a French instrument maker, Pierre Vernier, devised a way to improve the precision of length measurements. The vernier caliper ( ● Fig. 2), commonly called a vernier, consists of a rule with a main engraved scale and a movable jaw with an engraved vernier scale. The span of the lower jaw is used to measure length and is particularly convenient for measuring the diameter of a cylindrical object.

05 cm. 4 Zeroing and error. 26 EXPERIMENT 2 / Measurement Instruments (Mass, Volume, and Density) Similarly, if the error is negative, or the vernier zero lies to the left of the main-scale zero, measurements will be too small, and the zero correction must be added to the measurement readings. 05 cm as in Fig. 05 cm C. The Micrometer Caliper The micrometer caliper (● Fig. 5a), commonly called a mike, provides for accurate measurements of small lengths. A mike is particularly convenient in measuring the diameters of thin wires and the thicknesses of thin sheets.

Show the final form of the equation and calculations. Calculations (show work) Value of spring constant of spring in Fig. 7 ____________________ (units) (i) The data in sections (g) and (h) above were for the same spring. Compute the percent difference for the values of the spring constants obtained in each section. (continued) 19 E X P E R I M E N T 1 Experimental Uncertainty (Error) and Data Analysis QUESTIONS 1. Read the measurements on the rulers in ● Fig. 9, and comment on the results. 9 2.

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Amateur Telescope Making by Albert G. Ingalls


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