I have used Master Bond epoxies in the past with excellent results. They are more expensive than the typical epoxies you find in the big box hardware stores. I used one of their epoxies to repair the

Re: Thermal imaging cameras There are now some very reasonably priced thermal imaging cameras that will plug into a tablet or cell phone (used for the control software and display). Examples: FLIR One

Sellers who don’t know how to pack and the shipping services are the bane of eBay buyers. I had a 7854 arrive with many of the knobs on the front of the mainframe and the plug ins broken. I was surpri

If I am not mistaken, the big RCA 2” quad video recorders used by most studios had both a Tektronix waveform monitor and vector scope built into them. yahoo.com@groups.io> wrote:

I know some astrophotographers also pushed speed by “preexposing” film. They would expose the film to very low-level light. I think the idea is to push some of the silver halide closer to the energy t

This table: https://www.phosphor-technology.com/crt-phosphors/ does not include P400 but it shows two versions of P1. Same chemistry, but note the column “particle size”. If particle size is like film

Oops - lost the last sentences from my previous message. It should read: "Much of the ground support equipment from the Project Mercury days (and even as late as Apollo and the Shuttle) is now gone, p

If you can prove it was actually used in the Mercury program and not just the same *type* used in the Mercury program, it could have some value to collectors of space program hardware (disclosure: I a

Jon, EBWs were used in the explosive actuators for spacecraft - things like bolt and cable cutters between rocket stages and drogue parachute suspension line cutters. I have a pyro tester used to conf

With so much discussion of capacitors that explode, I thought some of you might be interested in this video of the high-speed photography guys exploding electrolytic caps by exposing them to overvolta

To all who have been giving advice about the Rifa capacitors - thank you! I know much more about the capacitors in my vintage HP and other electronics from the era when the Rifa capacitors were common

When I was in high school, a fellow “future mad scientist of America” was given a bunch of tantalum slugs. My guess is that these were destined to become capacitors. They were about 6-7mm square and 4

Maybe someone knows the answer to this. I have some HP equipment (counters) that have capacitors that look a lot like the Rifa ones, though they are labeled with some other manufacturer’s name. Is it

I have come to realize, now that I am mostly retired, that of the various projects for which I accumulated stuff would amount to most of a career in engineering and optics. I have quite a few Tektroni

I don’t know if you have seen the output of a modern ECG machine, but they are digital and have on-board computing power. They are actually not much larger (in some cases smaller) than the older analo

Greg, I actually have a couple of these early moving map display things. At one time, I actually had a display that took the film cassettes. You noted that it would move the map to correspond to the a

The engineers who were looking at template matching in Fourier space were certainly aware of what the defense guys were doing (that was not classified), but they were interested in fairly “mundane” ap

Optical correlation and convolution are analog methods that have been used for years. We did some of this years ago when examining the modulation transfer function of x-ray imaging systems. We used a

I don’t know for sure, but you might find the 680 dimmer. One technique for extending lamp life is to derate it. So operate it at lower voltage/current than you would for the equivalent brightness as

Mercury batteries used mercuric (II) oxide. Mercuric oxide is toxic and can be absorbed through inhalation as well as exposure to bare skin. Not nearly as bad as dimethymercury (one drop even with a p