I'm catching up for having not accessed this email account for a few days. I see that some of you mentioned slide rules. I've been looking for one of the old Pickett classroom models that were something like six or seven feet long, to go with my own personal slide rule set that I bought in 1970. That set consists of a "normal" 10-inch model and a 6-inch pocket model. I used to keep the 6-inch model in the glove box of my VW Beetle to calculate gas mileage - when I couldn't do it in my head. I remember paying $39.95 for the pair. More than I paid for my first calculator, but the calculator also only did four arithmetic functions. I also have my Dad's calculator that he bought in about 1946 - he was a physics major. And to get this back on topic: Have you all seen the multi-sided slide rule that was used at Lowell Observatory? I think it's in the museum there, and it is really cool, or at least I thought so when I saw it. I can't remember the degree of accuracy it could achieve, but that, too was really impressive. Kim -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Monday, December 19, 2011 5:33 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] Old Macs (Was: Need memory?) Still have my slide rule too! Gawd, we're old.