Related Object Info
Palmer's Computing Scale with Fuller's Time Telegraph, issue four
Yellowed cardboard square, with red, gold-embossed cloth edges, joined at center by a metal fastener to two yellowed cardboard discs (one on either side). A flowered pattern is engraved in each of the square's four corners on both sides.
Printed on the face of the cardboard square around the circumference of the top disc is a logarithmic scale carrying values 1 to 10. A diamond, labeled "Mult. &Div.", is printed to the right of the 1 mark. Printed on the top disc around its circumference is a second logarithmic scale, also carrying values 1 to 10.
In total, fifty-seven gauge points on either of the two scales are labeled for different mathematical functions.
Two scales are printed on the back of the cardboard square around the circumference of the bottom disc. The outermost scale has values descending from 365 to 1 in a clockwise direction; the innermost scale has values ascending from 1 to 365 in a clockwise direction. A box surrounds the 365 mark on both scales. Every seventh value on the outermost scale is marked, "w. 1", "w. 2", "w. 3", and so on; the values in between are marked 1 through 6, in order. Approximately every thirtieth value is marked, "M. 1", "M. 2", "M. 3", etc. The value 10 on the outermost scale is concealed by a small metal pin.
Printed on the bottom disc around its circumference is a scale composed of the twelve months of the year in succession, graduated into days. Directions for the slide rule's use are printed above and below the center bolt.
This instrument, together with 5464 and 5466, is stored in a grey cardboard envelope with fabric tie from Harvard College Libraries. A Harvard College Library bookplate is affixed to the inside front cover the envelope; a pocket for circulation cards is attached to the back inside cover.