Drawings

Grids

• Hexagonal grid pdf ps *
• Triangular grid pdf ps
• Rhombic grid (with diagonals) pdf ps
• Brick grid (to draw bead designs) pdf ps
• Sheet music pdf ps

Papercraft

Flexagons

• Tetrahexaflexagon (x 7) pdf
• Pentahexaflexagon (x 6) pdf

Polyhedra

• Triangular prizm (1", x9, glue) Cube (1", x6, glue) Tetrahedron (1", x16, no glue) Tetrahedron (1", x24, glue) Octahedron (1", x12, glue) pdf ps

Calculators

• Addition pdf ps
• Time zones conversion (both pin pivot and paper pivot) ps
  This calculator must be customized to include only those timezones that are important to the user. This is why only .ps version included.
• Time-speed-distance calculator pdf
  This is distance/speed and time scales of НЛ-10 slide rule, but in a circular form. It is somewhat similar to E6-B flight computer, but has 3 decades instead of one. Arguably, this simplifies estimation of decimal point position at the expense of lower precision. Normal slide rule with 2 log scales (3-decades each) is included on second page.
• Simple device to measure observed altitude pdf ps
  Thread and bob needed for operation
• Calculate number of refills to achieve desired concentration pdf ps
• Calendar calculations pdf ps
• Kepler equation nomogram pdf

Other

• Archery targets * *
• Archery arm guard pdf
• Marine compass card ps pdf
• Angle measuring device (to print on transparency) pdf ps
• Pocket chess pdf
• Pseudo color disks (to print on 3×5 index card) pdf