8 Mar
2023
8 Mar
'23
5:41 p.m.
On Wed, Mar 8, 2023 at 2:16 PM Chuck Guzis via cctalk <cctalk(a)classiccmp.org>
wrote:
On 3/8/23 13:53, Sellam Abraham via cctalk wrote:
1.76 pounds on the (aluminum?) reel. That doesn't seem like much, but it's
on a 6" reel, and it definitely feels dense when held.
Phosphor-bronze makes more sense. Thanks for the clarification.
Sellam
On Wed, Mar 8, 2023 at 1:39 PM Chuck Guzis via
cctalk <
cctalk(a)classiccmp.org>
wrote:
Heavy bugger,no?
Nickel-plated Vicalloy (a type of phosphor-bronze).
On the subject of 1/2" open-reel tape, I
note that the tapes initially
used with the IBM 726 drive (1952) used a cellulose acetate base. In
1956, a switch was made to Mylar. That's unfortunate, since early
existing 726 tapes have almost certainly rotted away due to vinegar
syndrome.
I have what appears to be a stainless steel UNIVAC tape. It isn't
crumbling away into dust anytime soon.