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abbreviations Align ampere Appendix arrow backspace backspace one unit Baker-Nunn camera begin typing brackets builtup fraction capital letters caret center point Chapter chemical chemical elements chemistry Column head commas Cont corrections denominator dot bonds entries equal sign Example exsec figure footnotes format formulas frequently full space Greek alphabet grommet half space horizontal indented indicated journal keyboard limit line of typing main line material mathematical matrix notation one-half space paper paragraph parentheses patterns platen down one-half radicand reference rough draft runover lines Section shilling fractions signs of operation single spaced Smithsonian Astrophysical Observatory solidus sometimes space and type space bar space three units style summation superscript table of contents technical typing technical typist term turn platen turn the platen type capital type diagonal type lower type second type underscore type vertical bar typewriter Typit bars units and type vector word